I have a Z80 (66cc) on a mountain bike. I have upgraded to a 0.76mm main jet, cut off the internal pipe on the muffler cover and screwed in a 3/4" socket with a 3/4" extention pipe and I have a few extra holes drilled in the back of the carb cover. I have also reamed out the intake side of the carb a little and had a bit of a go at opening up the muffler flange where it bolts onto the cylinder. I also have a new NGK spark plug cap and wire and use a NGK B**6** plug. I have also put on a 36 tooth sprocket.
Now is 40km/h about what this thing should do flat out? Maybe if I was going down a hill or let it ring out a bit longer I could get 45km/h but I thought it would go a bit faster than this. It pulls pretty good but just wont seen to rev way way way out. It pulls pretty good to about 38km/h then goes back to chugging a bit. I have also only done 350km/s about 3 tanks. Will it loosen up a bit more?
Steve
Now is 40km/h about what this thing should do flat out? Maybe if I was going down a hill or let it ring out a bit longer I could get 45km/h but I thought it would go a bit faster than this. It pulls pretty good but just wont seen to rev way way way out. It pulls pretty good to about 38km/h then goes back to chugging a bit. I have also only done 350km/s about 3 tanks. Will it loosen up a bit more?
Steve