300ex CRF250R Hybrid build up thread

[born2ride14]

Ok guys, getting an 07 crf250r motor with carb and electronics this weekend, i am gonna plant it in my 250x frame.

so far i have bought the following

yfz radiator-$55 shipped
05 crf250r exhaust system-$ 60 shipped


This week i fixed the swingarm pivot bolt, i still have to box it in.I am going to use the swingarm i have, and chop the middle out to accept the motor.

Here is what inspired me

will get pics this weekend when i pick up the motor

[woodsracer144]

very nice! do you have anymore pics of that other one? im gonna be doing the same thing... some time... hopefully!

[born2ride14]

no other pics. but the motor i got last night was seized, so i am returning it today. I set it in the frame, to see what it looked like, and i defenatley need to move the upper left frame rail. I am going to buy a 86 87 style 250 swingarm and build a bracket to hold the motor just like the 250r is set up.

[woodsracer144]

where did you get the motor from? what frame rail do you have to move?

[jonboy]

I would love to see this build. I had thought of doing this one myself except using the crf250x version and using the dual exhaust. I thought it would be a very unique build.

[born2ride14]

i got the motor from yz426ex36

he refunded me my money now i am looking for a new motor.

The upper left frame rail has to be moved to the left like 3 inches to get clearance for the head.

The build will continue, just waiting on a motor

[woodsracer144]

are you forsure just going to use a crf? cause if you use the crf i might try a yzf or a kxf... something else... i dont really care what you use, i just thought i would run something else so were a little different... :devil:

[born2ride14]

right now i am leaning toward a kxf motor, but i am no sure yet

[woodsracer144]

Originally posted by born2ride14
right now i am leaning toward a kxf motor, but i am no sure yet

have you mounted the raidator in there yet?
im changing my front end up a bit, so i can put a 250r raidator in there... i'll post some pics for you...

[woodsracer144]

Originally posted by born2ride14
right now i am leaning toward a kxf motor, but i am no sure yet

what year kxf also? stay clear of the 04-05 even 06 imo rmz & kxf's

[woodsracer144]

there some from when i started at first then what its now... i dont mean to high jack your post, i just thought i would show you what im doing, the vertical rail that doesnt have 23* cut with the piece welded on it is where im gonna try and mount my raidatior, hopefully my stem will clear and all that and the exhaust will work out...
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/DSC01165.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/DSC01166.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/DSC01167.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/DSC01168.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312000957a.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312000957b.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312000958.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312000958a.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312001531.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312001532.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312001532a.jpg
http://i374.photobucket.com/albums/oo185/mornin151/x%20chassis/0312001532b.jpg

[born2ride14]

Looks good, i got the radiator mounted in tonight, i like the custom bracket i made for the bottom, looks really trick

[woodsracer144]

what radiator is that! that looks alot easier then what i thought it would be... haha!

[jcs003]

are you going to have the welds inspected? since its frame rails and box tube, it would be a good idea. as a precaution. you hit a jump and upon landing the frame buckles it could cause some serious injuries.

sorry if i sound like the fun police.

[born2ride14]

2]


yfz raditor

[woodsracer144]

Originally posted by jcs003
are you going to have the welds inspected? since its frame rails and box tube, it would be a good idea. as a precaution. you hit a jump and upon landing the frame buckles it could cause some serious injuries.

sorry if i sound like the fun police.

i go to school for welding... no worrys...

[born2ride14]

SURPRISE!!!!!!!!!!!!

KTM 2006 250SX-F

[woodsracer144]

VERY NICE! thats what i think im gonna end up doing, buying a whole bike... then part out the rest... what year is it? did you ride it at all?

[born2ride14]

ok, try reading...... i already said the year.

I didnt ride it, i am too short..... but the guy zoomed through the neighborhood on it. man it scoots!

[born2ride14]

ok guys got the bike all apart today, what a mess, Set the motor in the frame, looks, like the frame rail will stay where it is. (lots of room)

This motor looks like it will fit very well

srry for the messy shop and bad pics

[born2ride14]

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[born2ride14]

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[born2ride14]

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[250x_kyle]

Originally posted by woodsracer144
i go to school for welding... no worrys...

just curious of what wall tubing you used on it.




looking good born to ride keep us updated.

[woodsracer144]

Originally posted by 250x_kyle
just curious of what wall tubing you used on it.




looking good born to ride keep us updated.

1/16 its as really close to OE...

[quadfmx]

no offense but would a 400ex frame be better suited for handling etc, i had a 250x and the 400 way out handled it and its got so much more aftermarket support for chassis mods like aarms swingarms shocks

i think its a great build, im doing a crf450 and i thought about the 250 but im a big guy and think it might be underpowered for me but if i was buying a bike it would be the 250
congrats on originality but i would re think the frame

[woodsracer144]

Originally posted by quadfmx
no offense but would a 400ex frame be better suited for handling etc, i had a 250x and the 400 way out handled it and its got so much more aftermarket support for chassis mods like aarms swingarms shocks

i think its a great build, im doing a crf450 and i thought about the 250 but im a big guy and think it might be underpowered for me but if i was buying a bike it would be the 250
congrats on originality but i would re think the frame


main reason im useing the 300ex 250x chassis and all that is because they are so easy to throw around... i can whip them around like nothing, the 400ex is a tank compaired to the 300ex 250x...

[quadfmx]

i hear that i had a built 250x back in 97 that was a 350 and i could whip it around like it was nothing,
i didnt know how much hp that crf engine would put out so weight is an issue,

did u see that ktm frame with the crf250r engine in it
i think ct did it

[250x_kyle]

Originally posted by woodsracer144
1/16 its as really close to OE...

what quality

[woodsracer144]

Originally posted by 250x_kyle
what quality

what are you trying to quiz me or something, i dont have the book with me that has all the specs here its at the shop...

[250x_kyle]

no. just wondered. its something id have looked into first. dont want to be usen wrought iron. but dont want to much carbon in it. you want it to flex but be hard.

[woodsracer144]

Originally posted by 250x_kyle
no. just wondered. its something id have looked into first. dont want to be usen wrought iron. but dont want to much carbon in it. you want it to flex but be hard.


oh, most the stuf is like a 1020- 1080 or like a A 36 mild steel. i'll get that book i have and get back to you on it. i think its 1040... most the mild steels around will be about the same, it also depends on if you have a hot rolled or cold rolled...

[250x_kyle]

Originally posted by woodsracer144
oh, most the stuf is like a 1020- 1080 or like a A 36 mild steel. i'll get that book i have and get back to you on it. i think its 1040... most the mild steels around will be about the same, it also depends on if you have a hot rolled or cold rolled...

theres even alot more to it then that but for this you only need the basics.

[QuadCobbler]

Thread jackers :mad: Start your own thread or stick to the topic. So any way what is going on with the KTM motor? Any new pics?

[woodsracer144]

Originally posted by QuadCobbler
Thread jackers :mad: Start your own thread or stick to the topic. So any way what is going on with the KTM motor? Any new pics?

sorry man didnt mean to.

kyle pm me if you need more information.. i know that the stuff im gonna run with it this metal will hold up...

[born2ride14]

no new updates will update this weekend after i get some work done

[250x_kyle]

Originally posted by QuadCobbler
Thread jackers :mad: Start your own thread or stick to the topic. So any way what is going on with the KTM motor? Any new pics?

thread jackers i think not. this could be very important information to born2ride. hes going to be welding in new mounts and may need this information.

keep us updated born2ride

[born2ride14]

no new updates i have a friend who has a fab shop i might get him to do it

[mildtowildracin]

ayee ill talk to my dad bout mountin the motor

[born2ride14]

took the caliper off the ktm, With a few mods, it bolted up nicely

[born2ride14]

klk

[born2ride14]

What do you think about this? This is the master cylinder off the ktm,i like how the reservoir is built in.

[BM@Ronayers]

Awesome build dude!!! I cant wait to see this thing done. I would love to build my 300 like this but its kinda hard working out of a storage unit.

[born2ride14]

got a part in, also just ordered some exhaust pipe stock to fit the stock one.

[trompen542]

If you want to do this project a whole lot easier, use an 89, 250r based frame, with a rmz, kfx,yfz,or ktm motor. They are almost a perfect fit, and there is no frame cutting. pictures are at kidsonquads.com readers rides section.

[born2ride14]

No pics, but i forgot to tell you guys that i dropped the quad off on saturday to MILD TO WILD RACING to get the motor mounted in the frame. Should get that back in 2 weeks or so. I ordered my custom throttle cable from motion pro, If you guys need a custom cable Toby @ Motion pro is the guy to talk to. Ordered some exhaust stock to lengthen the stock headpipe From JEGS, That should be here thursday. I took the Reel out of the carb to get to the main spring. The spring unmodified would be really stiff on thumb throttle, so i took it out heated it up and worked the spring. I eventually got the spring weaker to where it was equal resistance to the 400ex carb i was using.

[born2ride14]

should be getting pics soon

[born2ride14]

teaser

[born2ride14]

yay

[born2ride14]

more yay

[born2ride14]

is it worth me updating? Cuz no one is replying

[jonboy]

Well heres my reply. Keep posting pics. I enjoy seeing a good build.

[IRISH-RACER-14]

keep posting. i cant wait to see it done

[born2ride14]

ok just making sure i am not waisting my time

[born2ride14]

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[born2ride14]

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[born2ride14]

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[born2ride14]

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[born2ride14]

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[born2ride14]

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[born2ride14]

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[born2ride14]

jkh;

[born2ride14]

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[jcs003]

that is one long intake tube.

[born2ride14]

Gotta do what ya gotta do

[born2ride14]

pipe almost finished

[mildtowildracin]

looks good so far, if you run into any trouble with the pipe bring it over and ill weld it up. By the looks of it im gonna have to hurry up and heal so we can ride. (but not bostwick, that track hates me lol)

[R'Fanatic]

Been following the build... Looks AWESOME. Can't wait to see this thing finished!

[born2ride14]

Got everything hooked up, but its acting like its too lean . give it a few pumps od gas and it will start for 2 sec then dies

[jonboy]

Prolly is lean. You've reconfigured the intire intake setup vs. when it was on the bike so the jetting it had isnt going to work. You may have to toy with the jetting. Be sure to do the o ring mod on the AP lever. Also may need to get a smaller leak jet to compensate for the longer intake run.

[born2ride14]

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[jcs003]

not bad. very creative with the radiator plumbing.

[born2ride14]

Thank you, but i cant take credit, for the idea, i have a friend who is very smart, and he gave me the idea, but i made it, The sound quality sux ... i used my phone

[250x_kyle]

nice!!! looks good. let us know how the ride report on it is.

[jcs003]

whats the ktm motor compared to that bulky 300ex powerplant?

[born2ride14]

I am not really sure yet, i only took it around the block once and thats it

[jcs003]

Originally posted by born2ride14
I am not really sure yet, i only took it around the block once and thats it

sorry i left a key component of the question out.lol

whats the weight of the ktm motor compared to that bulky 300ex powerplant?

[born2ride14]

omg its like 20lbs lighter, but the radiator and other stuff probly adds up

[JR3]

nice to see someone start and finish a hybrid within a resonable amount of time. is the ktm motor all stock?

[lkrislong]

i see you didnt cut the swingarm to fit the engine in? i never understood why they do that. we are just finishing our daughters trx90/crf150r hybrid looks like we ran into some of the same things you did. just asking do you think you should try to rework the upper motor mount so the carb will fit on the head. our tank was in the way so our frame builder made a really trick mount to space our carb back but we had to heat up the tank and remold it to get the carb back on the head. the head has the flang that mates up to the carb make it really hard to come off. once you start jumping the carb would work its way loose

[188racing]

hey man sick build but one quick question about the build. kinda dumb but is that the 300ex gas tank or ktm?

[ss440ex]

Could you maybe use a pod filter?
May help out with the tuning, and get ya away from the long intake tube.
They make them with different angled mounting tubes.

Looks good, has to be fast!

[born2ride14]

I would like to keep the intake tube, but if all else fails i guess i have no other option

[born2ride14]

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[SRH]

Originally posted by ss440ex
Could you maybe use a pod filter?
May help out with the tuning, and get ya away from the long intake tube.
They make them with different angled mounting tubes.

Looks good, has to be fast!

the longer intake tube should not effect his jetting id think, i know intake tube length and intake manifold length all affect power but he could simply unhook his airboot and rip it around the street and see if it made a difference

[188racing]

post a vid of you on a track!!! its sweet man

[jonboy]

Yeah the intake tube will affect the jetting a bit. The longer tube creates disturbed air velocity that generally requires more fuel to atomize correctly. A clamp on pod will give higher volumes of air but it doesnt get disturbed and forced in like the tube setup. The longet head to carb boot will affect it as well but it will also give a higher torque curve than a short boot. Which should make it pull like crazy. It might be worth it to look into getting the largest UNI filter for the 400ex and a intake boot from a Bombardier DS650 which is tapered to give more airflow.

[born2ride14]

Originally posted by JR3
nice to see someone start and finish a hybrid within a resonable amount of time. is the ktm motor all stock?

The motor is all stock.

[JR3]

Originally posted by born2ride14
The motor is all stock.

yea i love the ktm 250s but they are a lil to rich for my blood i love my honda crf250 currently but always have my open for a nice used ktm 250 hows the maintenace on that motor easy to work on etc?

[born2ride14]

Yeah everything seems like its easy to get to, the reliability is great! from what i've read

[born2ride14]

How does this sound for pc?

Frame: Orange paint
A Arms: Stardust blue chrome
Swingarm: Stardust blue
Steering Stem: black paint

Hubs F|R: ?????
Bars: ???????

Nerfs: gloss Black
Bumper: gloss Black
Grab Bar: gloss Black

Rims F|R: gloss Black beadlock orange wheel

Fuel Tank: Matte black

Pipe|Silencer: Paint header and wrap, and black and orange silencer


Engine covers: Gloss Black

Spindles:??????

Brake stay: Chrome

Brake Pedal:????????????



WHAT ELSE NEEDS TO BE COATED?


Help Me on the ?????????????

[mildtowildracin]

make all the ??? pink, itll throw everyone off haha, but im still thinkin bout comin to watch this weekend, im just gonna wanna ride so bad but gotta wait to heal up :(

[jordan 23]

man this looks sweet nice build..but could you put new style plastics?

[IRISH-RACER-14]

do you do your own pc?an orange pc frame would be nice with those blue fenders. alot of blue white and orange would be nice

[woodsracer144]

Originally posted by born2ride14
How does this sound for pc?

Hubs F|R: ?????
Bars: ???????
Spindles:??????
Brake Pedal:????????????



I would make all those black accept for the brake pedal. make it crome or something that will be able to take a beating and still look nice... that PC will wear off when you ride...

[born2ride14]

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[born2ride14]

asdf

[born2ride14]

fsafa

[lkrislong]

very nice build did you have to do much welding on the frame or was it just motor mounts? have you had it on the track yet how did it do?

[born2ride14]

Not much welding, just radiator, head mount and bottom mount

[lkrislong]

cool im thinking of doing almost the same build since we just finished my daughters quad but going to wait til this 150r gets too slow for her which i hope is no time soon but my debate is the 300ex frame or the 400ex frame and i wanted to use the yzf250 or maybe the new ktm 350 which ive been told is smoking all the 450s in europe

[born2ride14]

who ever said the build ended???

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0310-Copy.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0315-Copy.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0316.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0317-Copy.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0318-Copy.jpg
Master mechanic Not bad for 14 yrs old i built it all my self

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0319.jpg


I did all the powder coat my self besides the frame.

I had ring blow by so i pt in new ktm rings and put it all back..... just need to shim the valves
http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0327.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0330.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0332.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0333.jpg

http://i195.photobucket.com/albums/z190/born2ride4/250%20mod/Photo0334.jpg

Thats it for now.... going out of town for 1.5 weeks then gotta come finish up the quad for dream camp. YEAH

[jcs003]

nice work.

[mildtowildracin]

richard did a good job on the frame, i picked up my swinger and arms, they looked great. And DREAM CAMP IS GONNA BE SICK :devil:

[QuadCobbler]

Originally posted by born2ride14
fsafa

Hey, just thought I would let you know unless you figured it out already, you'r swingarm is sitting a little high. Unless that pic was ur little brother working on ur quad (haha) which Im guessing it was you. If ur not heavy enough to compress the rear shock ur chain will drag on the chain guide until it is cut in two. I had to lower the back of mine down. btw you did a nice job on ur quad.

[born2ride14]

1. that was me
2. the shock is fin it just looks funny because of the tire under the swing arm
3. thankyou

[born2ride14]

still need to button some things up but running better than ever. i gotga to do the following.

make bracket for healgaurd
put exhaust springs on
zip tie all cables
change oil
get new front beadlocks and pc the rings

http://i195.photobucket.com/albums/z190/born2ride4/DSC09533.jpg
http://i195.photobucket.com/albums/z190/born2ride4/DSC09532.jpghttp://i195.photobucket.com/albums/z190/born2ride4/DSC09531.jpghttp://i195.photobucket.com/albums/z190/born2ride4/DSC09530.jpghttp://i195.photobucket.com/albums/z190/born2ride4/DSC09529.jpg

[QuadCobbler]

When you gonna post some video at the track?

[trx750gsxr]

X2 :D

[Pappy]

I got to meet Jesse this week and spent 4 days watching him ride and wrench. Great kid.....Great mechanical ability and a blast to be around!

The quad worked very well and trust me when I say he should be super proud of his work!!!

[born2ride14]

Thanks pappy, finally got to put a face to your user name,. I had lots of fun this week .I ll be back next year. I think everyone had a blast. I still cant believe cody with his last turn messup. o welll.

[IRISH-RACER-14]

pappy, where u taking pics? i wish i could go. even if i am on the other side of the world

[Pappy]

jesse-thats racin! It did go to show that when the gate drops the BS stops...I think he surprised a few folks taking command of the race:D I was surprised he salvaged 2nd so he was happy.


irish-yes I have tons of pictures. im pulling shots for the magazines now, then i can start uploading but i have to wait until i get some tech help on a watermarking program before i can get them on here....i hate technology lol

[IRISH-RACER-14]

u mean he came second on that thing?:eek2: must be a fast rider

[300ridr]

sweet build! i wish i could do my own powdercoating! do you still have the tc pipe?

[born2ride14]

nope. long gone

[BM@Ronayers]

Hands down the coolest 300 builds I have ever seen!!! Great job.

[ZSK]

Glad I could take a look at it this weekend. It is done very cleanly and does not sound like it's only a 250 hiding in there.:macho

[born2ride14]

no, its a 250 i dont have enough money for a big bore lol

[tomtom79]

Nice, congratulations on the build. Reading this makes me realize I need a new project.

[stevestauff]

your swing arm has a link what did you use and did it help get the ride height down. ive seen some and just looks to tall for mx. awsome bike

[stevestauff]

have you had any frame problems .basiclly cracks?

[born2ride14]

The only cracks have been ones from a wreck last season when i tweeked the sub frame i couldnt see them till the white powder showed it but its holding up great took a win yesterday and got the hole shot

[born2ride14]

Updated pics


http://i195.photobucket.com/albums/z190/born2ride4/3fa2cf72.jpg

http://i195.photobucket.com/albums/z190/born2ride4/501eba35.jpg

http://i195.photobucket.com/albums/z190/born2ride4/aa79c72a.jpg

http://i195.photobucket.com/albums/z190/born2ride4/38c72de7.jpg

http://i195.photobucket.com/albums/z190/born2ride4/38c72de7.jpg


http://i195.photobucket.com/albums/z190/born2ride4/dfe365c5.jpg

[IRISH-RACER-14]

looks sweet now.what front wheels are those?

[SHIFTx450]

Awesome build dude.

[redrider440ex72]

What is the gatoraid bottle for under the front right fender?

[born2ride14]

radiator overflow

[snoboardatv40]

How much did this build cost im looking to build a hybrid but still not sure if i want to build or just buy. Do you think the ex frame is the easiest to use or would a blaster with a 250f motor be easier. just trying to get as much info as possible before i start my own?

[socal]

Nice,I wish production would put out quads like this instead of the crap they have out now!