July 3, 2010

Well I am about to step off into the aftermarket carb (21 oko)/49cc cliff. I got my aluminum manifold with larger carbon reeds. Amazingly each reed is 4 mm wider and longer.

I installed the carb and manifold then scratched my head about making up a throttle cable. I ended up welding up a bracket and splicing the stock pull cable to a new short cable.

The tuning game begins again:
At first the bike would run only on the choke. I started turning in the idle mixture till it started carbureting. Pretty soon it was idling and accelerating against the clutch. That is it for today. Will do more tomorrow or the next.

My pipe is long at present It is 32.5" from the piston to the back of the rear cone. I was getting decent top end power when it was 29" I cut out all the small segments and welded in a 12" piece of 3" muffler pipe, before it is done I may be back to about 29". I have some new parts for tuning the transmission.

I'll share where this takes me.

I have tuned the OKO carb before and really thought it was a good value, with flat slide and std Keihin main jets.