I put a 75 jet in, clip second from the top. My top speed is lower, about 28 MPH but it runs surprisingly well. Throttle response seems perfect throughout the entire range. Really! No bogging at all no matter how I use the throttle or where it is between idle and WOT.
I bought a fine-tuning set of jets from Bikeberry so I'll be able to try 74 next, then 73 and then 72 again. One of those three should get me my top speed. I'm hoping to see top speed at 74 or 73 with a decrease with the next lower jet. If not, I can try the 71 jet and see what happens.
The other thing I noticed about jets is that if it is too big it becomes very difficult to set a good idle. Almost every setting was too high. I'd go lower and lower and lower until it was too low. Very difficult to find a sweet spot.
I expected the spark plug to be black and sooty again. It's not. Almost completely dry. The plug wasn't a new one so I'm not sure it's worth talking about the color of the electrode, except that I don't think it changed at all since I cleaned it. On my run a few days ago I put the clip to the middle (was using 70 jet that day) and did a low throttle ride and the plug was COMPLETELY black afterwards. I moved the clip back to where it was and when I got home, I cleaned the plug and put it back in for today's ride.
Anyway, I think I've finally got enough experience messing with the tune that I will be able to properly tune it now by down jetting then setting my clip and idle.
I bought a fine-tuning set of jets from Bikeberry so I'll be able to try 74 next, then 73 and then 72 again. One of those three should get me my top speed. I'm hoping to see top speed at 74 or 73 with a decrease with the next lower jet. If not, I can try the 71 jet and see what happens.
The other thing I noticed about jets is that if it is too big it becomes very difficult to set a good idle. Almost every setting was too high. I'd go lower and lower and lower until it was too low. Very difficult to find a sweet spot.
I expected the spark plug to be black and sooty again. It's not. Almost completely dry. The plug wasn't a new one so I'm not sure it's worth talking about the color of the electrode, except that I don't think it changed at all since I cleaned it. On my run a few days ago I put the clip to the middle (was using 70 jet that day) and did a low throttle ride and the plug was COMPLETELY black afterwards. I moved the clip back to where it was and when I got home, I cleaned the plug and put it back in for today's ride.
Anyway, I think I've finally got enough experience messing with the tune that I will be able to properly tune it now by down jetting then setting my clip and idle.
