Hey guys, a few weeks ago I had made a thread about not hitting top speed - I convinced myself things were running right until I rode my roommates freshly built e50 and almost popped a wheelie the powerband hit so hard. Here are the setups:
Me:
- Treats 70cc piston port kit
- Touring head for treats kit
- Mikuni vm20 with 117.5 main jet
- Timing at 17 btdc
- Cylinder spaced with 2 thick black base gaskets and one thin green (3 total)
- proma circuit pipe
- 17x45
- Temps under 370
Him:
- Airsal 65cc kit
- touring head for airsal kits
- Mikuni vm20 with 125 main jet
- proma circuit pipe
- 14x45
On a straight, I was full throttle at 37-38 while he cruised by me at 40+ with much different gearing. Basically, I'm still having the same issue where I don't rev out/hit the powerband. My top speed at 75% thottle is the same as WOT. My powerband barely hits. I have read that squish isn't perfect out of the box on this kit, so I just added some base gaskets and now the piston goes slightly under the exhaust port at BDC. Before today, I had the same setup except for 1 thick base gasket rather than 3, and the hi hi comp o-ring head. It seemed to have muchhhh better lowend, but the top end was the same (not revving out).
I've bought a new carb (had a bing clone 15 before) bought a new head, moved my needle clip, and messed with the main jet. I've read that kitted vm20's are running 130-170 main jets, and 117.5 is the lowest I currently have. Regardless, I should be hitting some form of powerband.
Any ideas?