stock cylinder power??

[XXX250R]

trying to decide on using a stock cylinder or aftermarket. what kind of power numbers are possible with a stock cylinder (of course ported) thanks.

[8686]

What are you going to be using the cylinder for? What type of riding? Respectable horsepower numbers can be achieved with a small bore size with the proper components and set up.

[XXX250R]

just playing around, mostly higher speeds/rpm.

[400man]

heres a fairly old video of my 250r back when I had it running in its prime. all it had was a mild play port, cr head gasket with stock head setup for race fuel, late model crank with 68mm 86' piston and spacer plate, vforce 3, 38mm air stryker and esr trx 5 pipe and silencer.

the banshee just the toomey pipes and and a coolhead and +4 timing.

http://www.youtube.com/watch?v=QyUfnzBIjQY

[Honda 250r 001]

you can make in the mid 40's with a mild stock cylinder.

[hondamancbr03]

Check out macdizzy.com.....He has a write up on a 250R cylinder made to run in the low to mid 50hp. It's a good read for 250r fans.

[1promodfan]

Originally posted by hondamancbr03
Check out macdizzy.com.....He has a write up on a 250R cylinder made to run in the low to mid 50hp. It's a good read for 250r fans.

I agree^^^^^you can really make some good numbers with a stock cylinder. With the right set-up, you could easily have a "sleeper" motor.

[86 Quad R]

deffinately not hard to do. its a matter of getting all the right matching components that works well with what your engine likes. once thats done you get the gearing that goes along with it and you'll have a handfull.

[XXX250R]

can anybody suggest a combo and reccomend a porter to get me around 50hp?

[tt racer]

baldwin,sparks,ftz,ct,c-leigh racing

[86 Quad R]

neil(c-leigh racing) or Titan (http://www.titanracinginc.com/)

[headache]

a good porter can get 50hp out of a stock jug. My brother has an 87r with ported cylinder, 36 carb and paul turner pipe. I'd say its upper 40's in hp. I don't think he's been beat by a 4 stroke yet in a drag :devil:

[86 Quad R]

Originally posted by headache
a good porter can get 50hp out of a stock jug. My brother has an 87r with ported cylinder, 36 carb and paul turner pipe. I'd say its upper 40's in hp. I don't think he's been beat by a 4 stroke yet in a drag :devil:

i can believe :D as stated, its in the setup. :cool:

[Honda 250r 001]

when i read that the first time i thought you said coarse porting, not of course ported. So a mild portjob would get mid 40's but a good someone good withing a cutting tool can get 50 hp out of a stock cylinder.

[8686]

Originally posted by Honda 250r 001
when i read that the first time i thought you said coarse porting, not of course ported. So a mild portjob would get mid 40's but a good someone good withing a cutting tool can get 50 hp out of a stock cylinder.

A mildly ported, pump gas engine will probably not get you into the mid-40s in horsepower at the rear wheels.

[Honda 250r 001]

Originally posted by 8686
A mildly ported, pump gas engine will probably not get you into the mid-40s in horsepower at the rear wheels.

in my oppinion... its very possible.

[400man]

on the oem cylinders, compression makes a world of difference in the power. im currently running about 170 psi and premium pump gas and my 250r is no where near what it used to be when it was up over 200psi and on race fuel. they say that more compression hurts the topend power (to a certain extent for sure) but I think it helps make the power "hit" alot harder and spreads over the whole rpm range.

[Aceman]

You need to do a search for "criminalpoet" on here, I believe he runs a stock cylinder and it puts out about the highest numbers I've seen. Mid to high 50's if I remember right. He also mentions who his particular builder is in a few of his posts.

[8686]

Originally posted by Honda 250r 001
in my oppinion... its very possible.

That's your problem. Everything you post is just "your opinion". You're always steering people in the wrong direction with your 1,200 posts about nothing at all. You never have any real experience to back it up. Have you ever built an engine like that and then strapped it on a dyno??? The FACT is, a MILDLY ported, low compression, pump gas engine will not make that kind of horsepower. It's not a matter of opinion. It won't do it. Stop with the "in my opinion" crap already!

[Honda 250r 001]

theres no point in arguing and ruining this dudes thread, because as stated above *******, different oppinnions are what makes a forum good, and i still believe what your saying is an oppinion.

here is my advice to this guy, if you have the money, defenetly get the aftermarket cylinder! If you dont, get a good stock cylinder and have it ported for your riding type and you will be more than happy.

[Honda 250r 001]

Originally posted by Aceman
You need to do a search for "criminalpoet" on here, I believe he runs a stock cylinder and it puts out about the highest numbers I've seen. Mid to high 50's if I remember right. He also mentions who his particular builder is in a few of his posts.

also buttermilk gets good hp numbers out of a stock cylinder hit him up.

[XXX250R]

I talked to ftz, he said he could get me about 55hp with a stock cylinder, their pipe, and 110 octane.

[Honda 250r 001]

Originally posted by XXX250R
I talked to ftz, he said he could get me about 55hp with a stock cylinder, their pipe, and 110 octane.

hehe, point proven 8686.

Anyway what type of riding do you do? Im not sure but i think that ftz builds top end screamer motors, if you ride trails, prolly not the best set up lol.

[headache]

yeah mostly does tt type motors, but i do know that they have a torque pipe too.. Oh and their motors scream!

[1promodfan]

Originally posted by Honda 250r 001
hehe, point proven 8686.

Anyway what type of riding do you do? Im not sure but i think that ftz builds top end screamer motors, if you ride trails, prolly not the best set up lol.


Originally posted by XXX250R
I talked to ftz, he said he could get me about 55hp with a stock cylinder, their pipe, and 110 octane.

Not trying to "bash" here, but read that post better. He said with 110 octane.......thats not a regular pump gas (93 octane) set-up.
And again its being built by a reputable builder. With their pipe, not just any "cookie cutter" pipe.

I have to agree with 8686 on this one. You can't really reply to a post unless you have experience to back it up. It can be done, but its hard to achieve those numbers with a stock cylinder. Everything must be just right to get those kind of HP out of a stock cylinder. I doubt my 310 even has numbers like that.

..........well said 8686

[86 Quad R]

based on what you stated about what type of riding your going to be doing, the best thing you can do is to have a nice play port done to it and set it up with around 180 compression, add a esr 5 pipe and a matched carb/intake. you'll have an engine that'll be fun to ride in most any terrain. any of those ftz engines are high strung and best suited for tt, dunes and/or drag. i dont think you'll like it for average riding.

note: if you want a real torque monster i'd suggest a short rod engine.

hit neil or titan up, they'll take care of you. ;)

[Honda 250r 001]

Originally posted by 86 Quad R

note: if you want a real torque monster i'd suggest a short rod engine.

hit neil or titan up, they'll take care of you. ;)

agreed!

[mcboomport]

i just had my motor dyno'd at arlans shop (LED). Stock Cylinder, mid-top porting, 4mill stroker, esr5 centermount, vforce reeds, 210 compression, mid-top porting(arlan did not port it, or it could have probably squeeked some more), 38 A/S carb, K&N Filter. bored 0.30, spacer plate.

about 47.8 rear wheel horse power.. I hope this can give you an idea.

[86 Quad R]

more importantly..... what were the torque numbers? :cool:

[hondamancbr03]

I was running 235 psi and had Arlen cut me a new dome down to 215 psi, I put it on a dyno at a local shop and lost 4 HP...Arlen told me that 235 is the sweet spot for HP.

I have 350PV so i'm not comparing notes to a stock cylinder, just showing what higher PSI can do.

[Buttermilk]

I've gotten mid to upper 50's out of a stock cylinder. That's with some serious porting and custom cut domes, and race gas.

I've got a write up in the dyno section, showing my build progression. http://www.exriders.com/vbb/showthread.php?s=&threadid=349083

I am convinced based on my own testing and development work that it is possible to get awfully close to 60 hp "IF" you get the porting right, the correct pipe, the right carb, the correct dome (combustion chamber), and correct ignition timing (programmable CDI is helpful) to get you there.

On myy last build, early indications were that it was going to do somewhere in the 58-59 HP range and that is without doing any ignition re-mapping. However, water leakage issues have halted my last 250R build.

I'd highly recommend you get ahold of Nate McCoy if you want to do an OEM jug and want some hp.

www.mccoysperformance.com

He's a standup guy and will treat you right.

Rog

[quad janern]

Originally posted by mcboomport
i just had my motor dyno'd at arlans shop (LED). Stock Cylinder, mid-top porting, 4mill stroker, esr5 centermount, vforce reeds, 210 compression, mid-top porting(arlan did not port it, or it could have probably squeeked some more), 38 A/S carb, K&N Filter. bored 0.30, spacer plate.

about 47.8 rear wheel horse power.. I hope this can give you an idea.

wow thats much more than i expected for a stock cylindered motor. Cool :)

[Buttermilk]

Here's an '87 oem jug I ported. ESR11 centermount pipe, 41.5 PWK taperbored carb, CR +Dyna Ignition, VF3 Reeds, Cool Head w/ 21.5cc net volume dome (~209 psi; 15.89:1 UCCR). This is on a 67 bore x 76 stroke. +4 mill crank, 130.3 rod engine.

Regards,

Rog

[86 Quad R]

very dayum impressive/respectable output. >cheers< :D