by jbcollier » Sun Nov 22, 2020 9:14 pm
Cool, that actually looks very good.
I have a custom expansion chamber on mine. It's HUGE. But it gets the job done. My primary is much, much longer to boost at low revs. I can pull 80 kph prone up modest hills. It's bleed'n loud though and I've been thinking of trying another pipe. Siagon Scooter centre used to offer one but it was absolute crap. That's why I had a custom one made.
First, check the flow from your fuel tap. You might have to take it apart and drill out the holes if you're not getting decent flow.
Next get a series of jets larger than stock. Keep going larger until it 4 strokes at WOT. Then back down as I explained above. Do not be fooled by it running "fine". 2T engines run great when lean but they then overheat and burn pistons.