Tuning question, high speed drop in power?

**ducatilover** · 28th January 2012, 20:08

Originally Posted by nzspokes

To be honest, I dont know what a CVK carb is.

So the bike has beter top end and speed but seems a bit flat mid range. So Im gunna try either staying with this jet size and dropping the needle one notch or going back to the original jet and lifting the needle one notch.

http://www.google.co.nz/search?um=1&hl=en&safe=off&rlz=1C1CHKB_en-GBNZ458NZ458&q=keihin%20cv%20carbs&gs_sm=e&gs_upl=39037l39037l0l41555l1l1l0l0l0l0l325l325l3-1l1l0&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1166&bih=784&ie=UTF-8&sa=N&tab=iw&ei=SawjT9vDFsqfiQe1u-jTBA

As I've said, I have a spare set of them, off a ZZR400, I would imagine one of them with the correct jetting will make your bike rather happy. They are vac. slides and reliable as all hell.
One of them has a smashed pilot screw holder, the other three are sweet.
Do a bit of research if you're interested and if you want 'em they're yours for the cost of postage, I'll throw in an intake rubber or two also and some jets.

**cowpoos** · 28th January 2012, 20:58

Originally Posted by nzspokes

86 CBX250rs. No limiter as it happens in a 500 rpm range. It can be fuel flow as it will hit max rpm much quicker in a lower gear so not using as much fuel.

Simple....get a bigger motor!!!