MOPED ARMY

It's got 360* intake duration right now.

Yeah, I'm thinking that with a lower hitting pipe it would solve the issue. I may try to borrow a friends pipe with a longer tuned length.

Right now this pipe is almost identical to the doppler pipe for peugeot (overall angles and lengths).

Isn't that a good thing?

If you have a hard hitting pipe, then it's good to 4 stroke a little before the powerband.

Or are you saying it's extreme 4 stroking where you can't even clear it sometimes? (edited)

Are you still cool everywhere else ?

Running a temp sensor ? Temps ?

I knew it was a needle issue . What needle did you go to ?

back pressure, you may have too much. That pipe is meant for 50cc right? You can also try a hotter plug and indexing the open side towards the exhaust port, both those things will make a bike four stroke less. But it also could be this weird thing that happens with hard hitting pipes and cdi's that fire at tdc and bdc. So cdi or points?

yeah its probably just a misfire where the timing goes from needing to be super advanced to when the pipe starts flowing and needs to retard. At that point the piston is moving very fast and the flame isn't spreading through the whole chamber before the exhaust port opens, but the pipe hasn't kicked in to boost the heat/pressure in the cylinder.

you can advance the timing to see if that is the problem, but you'll detonate like crazy when you hit the pipe so be careful. i would be super hesitant to do any down jetting because its probably an ignition misfire and not too-rich misfire.

Boy there are lots of vairables here! do you know what compression PSI you are at with that combo? I have heard big presure can blow out the points spark. which base gasekt?

thanks

pete