Either that, or stop the 4-stroke cheating.Originally Posted by TZ350
Pristine Knee Sliders
Either that, or stop the 4-stroke cheating.
Forum whore
Only issue with the 150 class in Asia is that every single fast bike is a KR - but knowing you guys any combination of parts is possibly better.
Im doing a racebike engine project and need a 350YPVS cylinder / piston just to measure up. Anyone got one I could beg/borrow/steal for a day.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
Fair weather rider
Hello everyone. I do dyno (snowmobile engine) in my personal garage.
I want to reduce engine noise in the garage because even though I have a big truck muffler outside. I realize that the noise is coming from inside the garage.
So to reduce the noise I thought of making a long silencer for each pipe with a length of approximately 900mm ( I know it's long but it's a brain storm) with an internal diameter of 38mm. Connect directly to the end of each tune pipe. At the exit of this long silence the exhaust would be sucked in by the large 8 inch pipes of the blower. My biggest fear and my question.
Will this long muffler extension with a diameter of 38mm change the tuning in your opinion?
Do you have a better idea?
No8 Wire Extraordinaire
I'm told there are lots of rumours of 180 kits. Bizarre if true.
Don't you look at my accountant.
He's the only one I've got.
No8 Wire Extraordinaire
Let's us know how you get on. All I've got is over sized ported barrels with wiseco.
Don't you look at my accountant.
He's the only one I've got.
Pristine Knee Sliders
177cc is common (67mm piston), but there are kits from Malaysia up to 210cc. These require moving the cam drive, so can be recognised if you know how.
I'm told that kits can be had for the Yamaha R15 up to 230cc, which are indistinguishable from the stock cylinder..
Certaily not good for the sport, but some people just have to compensate for their lack of talent with lack of integrity.
Bucket Racer/Crasher
It's a decent size industry in places like Malaysia and Taiwan. My Yamaha 125cc scooter is 229cc built with high quality inexpensive parts from Taiwan. They go to over 300cc but that's getting pretty serious with welding and machining.
Low personal B.M.E.P.
My experience with Formula Fords suggests the cheaters simply move from the rear of the pack to the middle...
If there's enough worry about cheaters, pull a couple of bikes down at random - after warning them it's coming.
Pristine Knee Sliders
MNZ has bought one of these:
Goes down a 12mm plug hole and logs the bore measurement. Only works for central plugs unfortunately, and the R15 is angled.
No8 Wire Extraordinaire
They used to file the GP winners top 3 into an aircraft hanger for strip down. Of course there were no fourstroke bikes in that mix back then until one of the sherrifs boys (Chris I imagine) won on a feelthy honda.
Don't you look at my accountant.
He's the only one I've got.
Hardcore Biker
A large percentage of the noise is generated by the inlet. Way more difficult to silence without creating a restriction. What do you do for intake silencing?
Hardcore Biker
Connect the Inlet to the Exhaust. Won't help with power.....but it will stop the noise!
Fair weather rider
Hello Neels.
Before I had nothing in front of the carburetors.
Last week I made myself a lexan box for 3 reasons.
-the noise
-always breathe in fresh air.
-calculate cfm with the air meter.
But I admit that I have doubts about the tuning.
Hardcore Biker
I would love to see a typical power curve of those bikes. Has anyone seen something by chance?
And does anyone happen have to a KR150 EngMod Pack file they would share?
Hardcore Biker
That should help but the flat sides of the box will still transmit a fair amount of the noise. Can you add stiffeners to the outside? Just thinking.
Nice looking set of pipes!
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