i have an '80 motobecane and it starts up fine, it doesn't rev as high when
accelerating and when it reaches a high rev it cuts out after 5 seconds of
reving and will pick up after 5 seconds after it slows down and do that
repetatively. It also idles fine. I have 8 motobecanes and i have gone
through 3 exhausts mixing and matchinig and they haven't changed anything.
The carbuerator is perfectly clean, and the compression and cyldinder is
perfect. The spark is perfect and all gaskets are perfect throughout the
bike. I have no clue what it could be and i was wondering if anyone knew.