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View Full Version : 426 2 smoker anyone want to guess?



pb_paulie_b
03-28-2007, 06:09 PM
It's a 79' YZ400 with a 3mm big bore. 85 bore x 75 stroke = 426cc
Mods:
Full DG exhaust
Lightened flywheel
Flowtek porting
V-force reeds 3- yes Moto Tassinari made them for me.
milled head
polished exhaust port
race gas
Like most I'm just wondering???

03-28-2007, 06:15 PM
46-51 hp

pb_paulie_b
03-28-2007, 08:32 PM
Thanks Honda86!

03-31-2007, 08:59 AM
thats just a guess, i figure its a older model and but still a big bore, the newer 500s were somewhere in the 50-60 range so i would say somewhere in the 40s, maybe 50

03-31-2007, 09:00 AM
post up pics of the hybrid, it sounds very origonal. how well does it do agenst 450s, and banshees in drags?

pb_paulie_b
03-31-2007, 03:20 PM
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000593.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3025.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000544.jpg
It's still in the build up so I know there are items I need. It does run and run good. As far as racing, I've only raced one quad that is even worth mentioning and that was a Bruteforce 750. I beat him easily and I started off in 2nd.

03-31-2007, 03:41 PM
very cool blaster, looks like a sleeper :D Im sure you will be able to hang with stock banshees and 450s, but i doubt piped shees and 450s...still very sweet ride. Im sure it is somewhere in the mid to upper 40s hp, are you happy with it?

03-31-2007, 04:39 PM
wow those front tires have a few miles on them dont they? good to see someone using their quad :D

pb_paulie_b
03-31-2007, 07:32 PM
I built this entire quad for the price of a good 450 exhaust :)
I ride with a friend who has a wolverine 350 and while he's bangin gears contantly on the trail I just keep mine in 3rd the whole time.

04-05-2007, 03:09 PM
wow thats awsome you built that quad for under a grand or so...i bet you could probally beat a 450 in a drag too

pb_paulie_b
04-05-2007, 03:29 PM
Eh forgot about the shocks and airbox. I got about $1200 in it quad included. I would love to race a 450. I'm a lil' scared, technology is a *****:) I did beat that Bruteforce with the stock 400 and a pipe tho.
I really wanted to get the head ported but 426cc's is the max the cylinder can go. I have an extra cylinder still on it's standard bore that I might have ported.

blasterfreak99
04-05-2007, 04:24 PM
porting wont increase the bore size it just changes the port timing (when the air/fuel mixture gets into and out of the cylinder) so you could have the 426 ported but you would have down time ;)

oh and its good to see that you finally got some rear tires lol

pb_paulie_b
04-05-2007, 08:46 PM
Originally posted by blasterfreak99
porting wont increase the bore size it just changes the port timing (when the air/fuel mixture gets into and out of the cylinder) so you could have the 426 ported but you would have down time ;)

oh and its good to see that you finally got some rear tires lol
What I mean is I don't want to dump money into porting a cylinder that goes in the trash after it wears out. Yeah the new tires have a lil' more bite then bald turf tamers :)

blasterfreak99
04-05-2007, 09:05 PM
Originally posted by pb_paulie_b
What I mean is I don't want to dump money into porting a cylinder that goes in the trash after it wears out. Yeah the new tires have a lil' more bite then bald turf tamers :)

oh i see...lol. my bad and id say that they would since the lugs are like 1 1/2 in deep

04-06-2007, 06:48 AM
a ported 426 2 stroke should walk all over the 450s. My ported 265R beat 450s

pb_paulie_b
04-06-2007, 07:29 PM
Originally posted by Honda86
a ported 426 2 stroke should walk all over the 450s. My ported 265R beat 450s
In your opinion what would make more power, an unported 426 or like a stage 2 ported 400 (fresh .25 over)?

04-07-2007, 08:21 AM
a full ported 400, as long as the port job was done by a good builder. Porting is one of the biggest factors in a 2 stroke. I had my banshee ported and piped and i ran it up agenst just a piped shee and it wasnt even close. CC does play a factore but not as big as everyone thinks. Just get it ported good and have the right reed and carb set up and get your jetting spot on and youll be saying goodbye to piped 450s ;)

pb_paulie_b
04-08-2007, 06:22 PM
Cool! Now I have something to look forward to when the 426 wears out :)

04-09-2007, 07:42 AM
yup, the hardest part would be finding a engine build to port that old yz 400....they are not very popular so you would have to find a builder that has been around for a while so they kow what they are doing with your jug. What would you compare your 426 to as far as speed and power? now that it is in a blaster frame the power to weight ratio will increase because of how light blasters are. would u compare it to a 450 or a banshee?

pb_paulie_b
04-09-2007, 05:05 PM
I don't really have too much experience with quads. This is my first. I do know it does got some power! It's really not that heavy (the motor) and the Blaster chassis is light soooooo. I need to gear it down 5th is not really usable- to me anyways. I'd rather have more acceleration and less top speed. I was told with the 2 inches I had to add to the pipe that the power band has shifted to a lower rpm and I beleive it. I can start off in 4th with just a lil slip of the clutch. Heres some shots of it off the frame. I'm painting, powdering and polishing the whole quad while I have the motor out and re-building it. too bad I already bought the 426 kit.
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000769.jpg

http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000767.jpg

Heres a crappy vid. Stock just piped and with bald tires. I had it in 3rd and you can see how fast those tires turn + I drove away almost from a stop. Lots of low end grunt.
http://s31.photobucket.com/albums/c387/pb_paulie_b/?action=view&current=IM000580.flv

04-10-2007, 06:16 PM
boy i would really like to have a 400 2 stroker. I am sure if you tune it in properly you will see some very good HP gains. Did you ahve to do any major frame changes or any motor mount issues?

pb_paulie_b
04-10-2007, 07:26 PM
None of the stock mounts worked. In fact I ground all of them off. I tried not to but I had to cut the frame just to shoehorn the exhaust in. I have some temp pieces of steel in place. I plan on welding in some tubing to fix that permanently. All in all I thought the conversion was pretty easy.

04-10-2007, 09:22 PM
dont sound too hard, i cant beleive all the motor mounts worked, thats good news for you :D

That is definatly a hybrid i would consider building. A old school 400 2 stroke in a light frame ;)


Do you have any idea who you want to get the porting done by?? are you ever going to get it on the dyno? Your video looked good. Get some videos of you riding it on dirt (no snow) or concret to show us what she really can do!

04-10-2007, 09:23 PM
That motor is so freaking clean its unbeliveable. Almost looks liek it was a new 400!!

ShiftMX91
04-10-2007, 11:30 PM
what kind of shocks do you have on it?

pb_paulie_b
04-11-2007, 03:44 AM
Originally posted by Honda86
That motor is so freaking clean its unbeliveable. Almost looks liek it was a new 400!!
You know how I do :) I media blasted that thing, restored the plastic stator cover, and powdered the clutch cover :)
I was doin some looking on-line about the porting and http://www.madmanengineering.com/porting.htm these guys appear to know what their doing? Gimme a minute to get everything shiny and I'll definitely have a new vid up.

pb_paulie_b
04-11-2007, 03:45 AM
Originally posted by ShiftMX91
what kind of shocks do you have on it?
06' YFZ450 all around.

ShiftMX91
04-11-2007, 11:05 AM
did you have to do any other work to make them fit? i want to put the yfz shocks on mine to so im just getting an idea

pb_paulie_b
04-11-2007, 08:22 PM
The YFZ shocks are a tad bit longer then Blaster shocks. If you compress them a little they bolt in at the top just like the stock ones. The bottom mount has to be ground away slightly- no big deal as seen in the pic. With this direct bolt in set-up they will be on the stiff side mainly because they are compressed. I made brackets out of 1/4 steel to compensate for this and add 3 inches per side. People get on me about the brackets but for me they serve their purpose and work well.
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000532-1.jpg

Yes I really did make them, not get them off Ebay
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000364.jpg

http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000540-1.jpg

04-12-2007, 08:55 AM
i think you get the balest front tire award :D

but when are you going to get a video of this thing? i am curious to see what it would run in a 1/4 mile too

pb_paulie_b
04-12-2007, 07:40 PM
HAHA If I had a dime for every bald tire comment! That's the way they were as delivered. Looks like somebody liked to ride on the road...ALOT! Maxxis front pro's will be here next week. As far as a vid we will see one in prolly a month. That might seem long to you but know it's kill'in me too :)

sc400ex_rider
04-17-2007, 05:43 AM
how do you start it ? there is no kicker. i always wanted to do somthing like that but you need a reverse kickstarter like the 250r

pb_paulie_b
04-17-2007, 04:15 PM
What do you mean? I kick start it like normal. I took the stock kicker and heated & bent it out enough to clear the frame.

pb_paulie_b
04-27-2007, 08:31 PM
Update were a lil closer. I painted and polished the motor + Moto Tassinari made me some V-force 3 reeds. I believe I'm the only one in the world with the 3's for a 79' YZ400. How cool is that???
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3070.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3045.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3110.jpg

04-27-2007, 09:16 PM
That motor looks flawless, I love this hybrid so much! Very creative! Does it viberate too much or no?? Pretty cool you got V force 3s on a 79 yz 400! And its even cooler you got a YZ400 powered blaster!

04-27-2007, 09:22 PM
another mod you should look at doing is lightening the flywheel and have it ballanced to get quicker RPMs out of it. Those older 2 strokes didnt rev like the new ones today do. Lightening the flywheel will help out.

Do you plan on running race gas? Are you droping the compression at all?

GPracer2500
04-27-2007, 09:40 PM
Originally posted by pb_paulie_b
Update were a lil closer. I painted and polished the motor + Moto Tassinari made me some V-force 3 reeds. I believe I'm the only one in the world with the 3's for a 79' YZ400. How cool is that???
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3070.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3045.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3110.jpg

Wow, that looks nice.

pb_paulie_b
04-28-2007, 05:48 PM
Originally posted by Honda86
another mod you should look at doing is lightening the flywheel and have it ballanced to get quicker RPMs out of it. Those older 2 strokes didnt rev like the new ones today do. Lightening the flywheel will help out.

Do you plan on running race gas? Are you droping the compression at all?
It only vibrates bad at a low idle. I raised the idle a tad to compensate.
Is lightening the flywheel something I could do myself? Is there any negative effects from doing this? I was actually entertaining the thought of running alcohol. I notice the motor ran hot all tucked away in the Blaster chassis and the pipe routing doesn't help either. Alcohol runs alot cooler + it's priced about the same gallon to gallon with race gas.
FTZ performance said they would hook me with a pre-jetted 39.5/41mm alcohol carb "That motor would love"
Why would I want to drop the compression?

04-29-2007, 12:06 PM
sorry, i meant to say RAISe the compression.... No you cant lighten the flywheel at home, but it is not an expensive mod either. Running alcohaul might not be such a bad idea. I would get a prejetted carb as long as they dont want an arm or a leg for it. But i would definatly get the flywheel lightened a bit...look around alot of builders do it and it isnt that expensive

05-01-2007, 10:41 AM
get some pics of how you made the pipe fit too!

And get a video of this thing runniin on dirt or concrete :D

pb_paulie_b
05-01-2007, 01:34 PM
Here's a couple of shots of the pipe fitment + what I did about the heat coming off it :)
Stock.
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000426.jpg
Trial fitting.
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000432.jpg
Modified.
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000499.jpg
Wrapped :D The plastic ties are temporary.
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3120.jpg
As far as a vid, I gottah get it together. Lately I've been very busy and haven't had much time to devote to it :(

05-01-2007, 02:01 PM
you definaly dont have the most "flashy" quad but i bet she gets the job done! :D

pb_paulie_b
05-11-2007, 06:35 PM
Sent the flywheel off today to get lightened.

05-11-2007, 06:38 PM
awsome, do you know how much they are going to lighten it?? It just helps the motor rev out a bit faster.

05-27-2007, 09:44 PM
did you get the quad all together yet?? how does she run??

pb_paulie_b
05-28-2007, 03:23 AM
I just got the flywheel back. It's almost finised!
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3240.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3210.jpg

pb_paulie_b
06-02-2007, 02:17 PM
It's gettin close!
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000841.jpg
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000829.jpg

06-11-2007, 01:45 PM
looks very impressive...i cant wait to see the finished product. Itll rip!!

pb_paulie_b
06-11-2007, 02:43 PM
Power always gets the best of me. I sent my cylinder over to Flowtek to be ported :)

CHEVYZ
06-11-2007, 03:10 PM
Sounds like it is gonna be one hell of a ride!

06-12-2007, 03:43 PM
Did you ask if they have much experience with a old motor like that? what kind of porting are you getting? How much is the port job going to run you?

sc400ex_rider
06-12-2007, 04:47 PM
wow looks like your not messin around. 426 2 stroke blaster sic. your crazy to build it but i want to ride it.

pb_paulie_b
06-12-2007, 05:40 PM
Originally posted by Honda86
Did you ask if they have much experience with a old motor like that? what kind of porting are you getting? How much is the port job going to run you?
It's actually the moderator @ E2S doin it. He said the older motors respond better to porting than the newer ones. I don't know if He's ever done a motor this old though. He also said it's cool to post before and after pix so I'll let you check it out. It's getting the 'Aggressive MX, dune, and trail' port. There is a 'Full drag' port but I passed on that. Cost me $160. BTW it's Flowtek not Flowtech....

pb_paulie_b
06-12-2007, 05:49 PM
Originally posted by sc400ex_rider
wow looks like your not messin around. 426 2 stroke blaster sic. your crazy to build it but i want to ride it.
Yeah I've put so much time into making look nice that it just has to be fast too :)
The funny thing is before I did all the work to it you 'almost' couldn't even tell it was a YZ400 :D
http://i31.photobucket.com/albums/c387/pb_paulie_b/IM000339.jpg

06-12-2007, 06:20 PM
e2s is a great website. Im sure he knows what he is doing! I cant wait to see this thing finished...it definatly would have my vote on quad of the month, i dont care what chassis it is in, this is a very creative hybrid

blasterandy
06-15-2007, 07:06 PM
very, and prolly a very potent quad. I bet you could walk up to some kid with a totally aftermarket quad. (blaster or 400) and walk all over his behind. Just laugh at him spending his entire lifesavings and you spent just about as much as his pipe. :D

06-16-2007, 12:31 PM
i bet itll be faster then mild 450s and banshees too!! Especially because it is ported now :)

Now your main focus will be getting all that power down to the ground, thats a big downfall on these 2 strokes

LT250_JOE
06-16-2007, 06:54 PM
A LOT OF MONEY, AND STILL A BLASTER!

SWEET RIDE THOUGH

pb_paulie_b
06-16-2007, 08:35 PM
Originally posted by LT250_JOE
A LOT OF MONEY, AND STILL A BLASTER!

SWEET RIDE THOUGH
Ahhh thanks I think. I have about $2335 all total. sandblasting, painting, polishing, powdercoating, building, and fabricating everything myself saves serious dough.

moto04racing
06-16-2007, 09:39 PM
I found a kx500 engine im thinking about buying. but where did you get that engine and if you dont mind me asking how much was it?

pb_paulie_b
06-17-2007, 07:48 AM
I got it off Ebay for $250.

06-17-2007, 08:02 AM
2K is dirt cheap for building a hybrid like that! Itll be one of a kind for sure!

pb_paulie_b
06-17-2007, 09:22 AM
Originally posted by Honda86


Now your main focus will be getting all that power down to the ground, thats a big downfall on these 2 strokes
Those rear tires don't slip. I was pullin wheelies in the mud before I broke it down :) They are big & heavy 6 ply tires though.... I should of went with a 4 ply razor or turf-tamers but hey the woman bought the tires for me and I'm happy with them.

Boweman
06-20-2007, 09:40 AM
nice quad dude, this is the best overall hybrid i have seen in a long time. it looked like a stock blaster with a dg pipe in some of your first pics

pb_paulie_b
06-20-2007, 12:17 PM
Originally posted by Boweman
nice quad dude, this is the best overall hybrid i have seen in a long time. it looked like a stock blaster with a dg pipe in some of your first pics
Thanks man. It's taking longer then I expected but is turning out better then I could have guessed.
I might enter it in QOTM just for the hell of it :)

pb_paulie_b
06-23-2007, 11:54 AM
Alright here are my before and after pix of my cylinder after I got it back from Flotek. I'm pretty impressed with the work that was done. How do you reach all those tight spots??? Factor out the to and from shipping and it didn't take that long either. Thanks Flotek!
Before:
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3269.jpg
After- He totally redesigned the intake to be more modern, similar to the Suzuki Quadracer.
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3345.jpg

Before:
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3267.jpg
After- The hole was there before and is a casting flaw in the cylinder. I'll fill it with epoxy for the hell of it.
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3356.jpg

Before:
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3270.jpg
After: Nice knife edging.
http://i31.photobucket.com/albums/c387/pb_paulie_b/DSCF3339.jpg

06-23-2007, 03:34 PM
that port job looks real good!! Do you have the motor back together yet?

pb_paulie_b
06-23-2007, 05:01 PM
Nope I gave Denny the option of porting before or after it's bored and He choose before. This is actually my spare cylinder not the beautiful one in the previous pix. That one is standard bore and is going to stay that way. This one is now going over to Boretech to be hogged out 3mm's. They will be hooking me with their 'Carbide bore' which impregnates the bore with silicon carbide. Why? Because it will last 3 times longer than normal...PB

cr977
08-06-2007, 08:38 AM
is the bike done yet? i want to see sum pics or videosnof it running

pb_paulie_b
08-06-2007, 04:02 PM
Not yet. I just got back from vacation and got to take care of some priorities. I also have been thinking of getting a new more modern carb than the Mikuni VM38.

pb_paulie_b
10-03-2007, 09:24 PM
Honda86 I added 3 new vids to the thread in my sig. It's all done. Whatcha think man ;)