scootermarc69 wrote:
Dynogrego. I am using the genuine PWK 28mm on my 190 kitted/SOHO cammed LX. I made of aluminum a 30mm extension tube from the intake boot. I then used fuel grade hose to connect from extension tube to carburetor.
Works well with the exception of a slight stumble from a stop if the slide is opened slowly
@dynogrego, You may be interested in this project of mine, Yet another exhaust mod. LX190
You might have the knowledge to get better results than I did.
Works well with the exception of a slight stumble from a stop if the slide is opened slowly
@dynogrego, You may be interested in this project of mine, Yet another exhaust mod. LX190
You might have the knowledge to get better results than I did.

Hi,scootermarc69
i have studied your carb mod and your exhaust project before.
The Keihin Pwk 28 when is used to 4strokes engines gives sometimes problems at low rpm,PE28 runs better.The stumble may dissapear if you lower the clip of the needle one or two positions to make the mixture rich and set the mixture screw then at the turns that gives the highest rpm with the throttle closed.
If nothing good happens,try a thinner needle to make the mixture rich enough.
The second reason i don't use extension tube at the carb,is that i am afraid it may affects power at high rpm.
About the exhaust my friend,stay tuned.
I am working on a Superflow flow bench now,we have to measure head porting,intake extension tubes,exhaust flow,etc.
Numbers are better than butt dynos.
⚠️ Last edited by dynagrego on UTC; edited 1 time