4t tuning thread

[woodyracer]

I thougt id make up this thread to stop people putting 2 stroke ones off topic,

I thought id start off, im plannng on doing a few things to the cbr, since i took it to manfeild ive fallen in love with its handling so now im keen to get it up in power. Its rather cheap to mod them too, with parts from thailand being good and cheap, Heres a site for cbr125r parts and cbr150 parts which you fxr riders will like.

http://www.aseanmoto.com/main.html

[TZ350]

Some very trick bits there, first time I have seen a 4-Stroke piston with cutaways in the skirt, very impressed with whats available.

Some theory to help you in putting it all together:-

Power…………………. http://www.bgideas.demon.co.uk/tmanual/Tm_Ch1.pdf
Breathing & Induction.. http://www.bgideas.demon.co.uk/tmanual/Tm_Ch2.pdf
Combustion…………... http://www.bgideas.demon.co.uk/tmanual/Tm_Ch3.pdf
The Exhaust System…. http://www.bgideas.demon.co.uk/tmanual/Tm_Ch4.pdf
Camshafts…………….. http://www.bgideas.demon.co.uk/tmanual/Tm_Ch5.pdf
Ignition Systems……… http://www.bgideas.demon.co.uk/tmanual/Tm_Ch6.pdf
Turbo or Supercharger.. http://www.bgideas.demon.co.uk/tmanual/Tm_Ch7.pdf
Engine Reliability…….. http://www.bgideas.demon.co.uk/tmanual/Tm_Ch8.pdf

Should be some very fast 4-Srokes at Taupo next year.
.

[NOID]

sweet site dude. itll be good to here what others ar doing to there engines . GO THE 4 STROKES

[woodyracer]

ordering a camshaft, high compression piston, racing exhaust from thailand, all for $400!!

[k14]

I took the muffler off my old CBR250 and that was the best performance mod I ever did. Made it sound awesome too, think it must have been worth about 7-8hp

[woodyracer]

I took the muffler off my old CBR250 and that was the best performance mod I ever did. Made it sound awesome too, think it must have been worth about 7-8hp

that sounds right, got to love grunty 4t's when they have nice a nice pipe

[TZ350]

Here you go, a handy INTAKE PIPE AND EXHAUST PIPE SIZING CALCULATOR http://dairally.net/daihard/chas/Mis...s/DaiPipes.htm now you can properly work out what size exhaust pipe you realy need........nothing like a bit of science to get it right....

[SS90]

I took the muffler off my old CBR250 and that was the best performance mod I ever did. Made it sound awesome too, think it must have been worth about 7-8hp

Your joking, right?

7-8HP on an IL4 250?

I don't think so!

[richban]

Some more handy calculators. http://www.wallaceracing.com/Calculators.htm

Don't get 2 excited about the HP one as it is working on a 170hp per liter. The reality is you have to have something very special to produce more than around 150hp per liter on a single cylinder. But it is possible. The rest have been handy, exhaust and intake especially they are simple to use as well.

Happy engine designing.

[saxet]

Here's another link for CBR parts http://www.akunar.com/BORE_KITS_RACE...RANKSHAFTS.htm

[woodyracer]

jsut ordered the parts,for $380!! that is very cheap for a titanium exhaust,racing camshaft,high compression piston

I realy do recomend these people price wise, they are the same parts as all the other sellers on the net but they are quite abit cheaper, also they speak good english.

[White trash]

I took the muffler off my old CBR250 and that was the best performance mod I ever did. Made it sound awesome too, think it must have been worth about 7-8hp

You're a fucken shit stirrer Kirk

[White trash]

Your joking, right?

7-8HP on an IL4 250?

I don't think so!

Do a bit more trawling through the bucket forums to see what this is all about. Fucken funny.

Pretty sure K14 is clued up on what works and what does't performance-wise.......

[Skunk]

Pretty sure K14 is clued up on what works and what does't performance-wise...

I'm not so sure... His bike is always running on three

[koba]

Some more handy calculators. http://www.wallaceracing.com/Calculators.htm

Don't get 2 excited about the HP one as it is working on a 170hp per liter. The reality is you have to have something very special to produce more than around 150hp per liter on a single cylinder. But it is possible. The rest have been handy, exhaust and intake especially they are simple to use as well.

Happy engine designing.

Haha! Just for shits and giggles I entered my known figures for an RG150 standing 1/4, It said 27 horsepower which is about what they are suposed to dyno at.