66cc sbp pipe tuning power w porting help please

sublunacy

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ontario
i have a 66cc w reed and 15mm walbro.
im trying to move the power back up after settling on a long manifold for low rpm but the engine wont get on the pipe like it would w a 4 inch shorter manifold.
am i on the right path if?

i port ex/tranfers to bring powerband back up to higher rpm???
 
Last edited:
no.

:)


its either use reeds, or use the extended manifold. not both.
 
No
the pipe works in harmony with the porting.
Use the standard exhaust, port for the desired peak RPM, then install expansion chamber and set the header length for the max rpm you want. Longer limits max rpm.
 
ok great. i edited my question for clarity. was just wondering about something. my topend rpm is perfect right now as it sits.
when i go shorter manifold to raise hp i should add some stinger length then to achieve the desired redline rpm? that sounds easy lol?
 
hate to say this but I think you have many confused ideas about how things work. You need to take the time to study this stuff.
Click on my signature link and read read read...
 
with pipe fine tuning 2 strokes? yes thats what every one is forced to do w our custom gasbikes. so for the first time/the best pipe is my own. i saw your bike jaguar sitdown. thanks
 
sit down? I guess you think this is a beauty contest or something.
I spend all my time improving function, not beauty.
Ride my bike and then lets see if you still want me out of the way.
 
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