racing engine setup tips for 4 stroke motorcycle

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galbert
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racing engine setup tips for 4 stroke motorcycle

#1 Unread post by galbert »

:) helloo.. im just askin some idea on how to aquire additional power to honda xrm 125 for drag race... actualy we were on a race and have our motorcycle updgraded, but we still need more power or any idea to aquire 12 seconds for 400m track?

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Re: racing engine setup tips for 4 stroke motorcycle

#2 Unread post by totalmotorcycle »

Can you tell us what you have done/upgraded/updated already on the Honda XRM125?

Mike
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Re: racing engine setup tips for 4 stroke motorcycle

#3 Unread post by ceemes »

totalmotorcycle wrote:Can you tell us what you have done/upgraded/updated already on the Honda XRM125?

Mike
Yeah, otherwise the only suggestion I would make is to strap a couple of JETO bottles to the rear of the bike.....instant acceleration. :laughing: :laughing: :laughing:
Always ask why.

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Re: racing engine setup tips for 4 stroke motorcycle

#4 Unread post by galbert »

ceemes wrote:
totalmotorcycle wrote:Can you tell us what you have done/upgraded/updated already on the Honda XRM125?

Mike
Yeah, otherwise the only suggestion I would make is to strap a couple of JETO bottles to the rear of the bike.....instant acceleration. :laughing: :laughing: :laughing:
totalmotorcycle wrote:Can you tell us what you have done/upgraded/updated already on the Honda XRM125?

Mike
totalmotorcycle wrote:Can you tell us what you have done/upgraded/updated already on the Honda XRM125?

Mike
hello,! yeah its funny... actualy, we have complete racing gears, racing cams, stroker, advanced timing standard flywheel, top cylinder head for higher compression....standard carbs with big main jet, and little bit bigger airflow, porting vavles fit to the carb manifold, battery drive racing cdi, etc... but its still hard to get 13s run for 400 m....??

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Re: racing engine setup tips for 4 stroke motorcycle

#5 Unread post by HYPERR »

galbert wrote:any idea to aquire 12 seconds for 400m track?
Bored and stroked 140cc ringer. :twisted:

EDIT: Wait did you say 400m??? :shock: The only way that bike is going to do 12 seconds in the 1/4 mile is if it fell off a cliff. :laughing:
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Re: racing engine setup tips for 4 stroke motorcycle

#6 Unread post by galbert »

yes, it is very possible, 400m in just 12s. because we have already achieve 13s in 400m...we're trying to make it 12s. I think you are not a racer my friend, or any motorcyclist, this topic is not suitable for you sorry my friend...

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Re: racing engine setup tips for 4 stroke motorcycle

#7 Unread post by HYPERR »

galbert wrote:yes, it is very possible, 400m in just 12s. because we have already achieve 13s in 400m...we're trying to make it 12s. I think you are not a racer my friend, or any motorcyclist, this topic is not suitable for you sorry my friend...
The best guys around here are running low 13s with terminal speed of around 100 mph. I'm not positive but the lowest I've ever heard around in the Northeast US is just dipping under 13. That's very rare for a buck and a quarter(125). Even the 250s mostly run in the low 13s.

When you talk about 12 seconds, you are talking about a whole different world. 1 second is an eternity in the drag racing world. Do you realize what kind of terminal speed you need to turn to run a 12 second ET?

You are also talking about a 4 stroke engine that was originally meant to power a scooter type transportation. Air cooled single cam 2 valve to boot. We are talking about an engine that makes 10 HP stock tops. If anything, I am amazed that you can even get them to run a 13 second zero yon(quarter mile) with that engine.

As for the insults, I am just going to dismiss it as a product of the language barrier. :wink:
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Re: racing engine setup tips for 4 stroke motorcycle

#8 Unread post by Wrider »

Here's a list of what I can think of.
Higher compression piston with race gas.
Lighter bike, especially drivetrain components like the chain, sprocket, wheel, tire.
Lighter rider, on a 125 the rider weight makes a HUGE difference.
Turbo
Nitrous
Lighter cams/valves/springs for a higher RPM limit.
Big-bore

Oh and the most important part of all, respecting established members of forums with racing experience where you're asking advice from.
He is right, a 125 running a 12s 1/4 is insane, and quite honestly Hyperr, even gravity only gives you so much acceleration... haha
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Re: racing engine setup tips for 4 stroke motorcycle

#9 Unread post by HYPERR »

Wrider wrote: Big-bore
That's what I said originally but that would make it a ringer. :ninja:

But then again, how are they gonna know. :twisted:
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Re: racing engine setup tips for 4 stroke motorcycle

#10 Unread post by Wrider »

Not sure what you mean by a ringer?
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Re: racing engine setup tips for 4 stroke motorcycle

#11 Unread post by HYPERR »

Wrider wrote:Not sure what you mean by a ringer?
Hard to define a ringer which is a slang term used in racing and other competition.

Examples of a ringer would be:

A bored and stroked engine actually displacing more cc than the class it is racing in.

A balanced and blueprinted engine racing against totally stock engines.

A 15 year old kid with a fake birth certificate pitching in the little league world series

A Heavyweight who falsified his weight fighting in the ring with a Light Heavy.

And the ultimate example of a "legalized" ringer would be...

A 1125cc Buell being allowed to race against 600cc race bikes and "win" in the AMA Daytona Sportbike Championship. :laughing:
Last edited by HYPERR on Thu Apr 08, 2010 8:28 am, edited 2 times in total.
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Re: racing engine setup tips for 4 stroke motorcycle

#12 Unread post by ceemes »

HYPERR wrote:
Wrider wrote: Big-bore
That's what I said originally but that would make it a ringer. :ninja:

But then again, how are they gonna know. :twisted:
Probably the same way my old man's Ford Anglia was rumbled, actual performance results didn't match the spec's so the race Stewards pulled him in, stripped the engine and found all manner of questionable modifications, including reboring the engine, along with tricked heads, cams and the like. Cost him a ton of points and his place in the standings. And this was back in the 70's.
Always ask why.

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Re: racing engine setup tips for 4 stroke motorcycle

#13 Unread post by Wrider »

Haha ok, so a cheater engine. Kinda like the 80cc ones they make for 50cc bikes that are stamped as 49cc displacements...
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