Hi! I have been reading the forums for a few weeks now since I put together my first motorized bicycle and have learned a ton. So first off thank you all for the wonderful information posted on these forums.
I have a 66/80cc china girl on my 21 speed Schwinn mountain bike, with SBP Expansion Chamber, HD Lightning CDI, RT Carb and better spark plug as the upgrades I have done to it. I plan to get a performance head when I have a little extra money to throw at it. I also had to replace the jug and piston due to a mishap with my throttle cable getting stuck outside the old carb and running the engine too high.
After taking it out for a test ride after putting on the upgrades but before swapping out the spark plugs, i noticed a small amount of 4 stroking, so I decided to swap the spark plug out for the newer one to see what would happen. After swapping it over the 4 stroking increased so I moved on to adjusting the jets. I have tried swapping out the standard jet(which was unlabled) from the RT for the #70 that came with it. I also have a 65/75/80/85 jets that I have not tried yet. When I put in the #70 jet there was very little power and it would not crank up when trying to get things going, so I am guessing I need to go up in size, but would like some advice before I go to far along.
As I know altitude can effect the running conditions I live at approximately 3300ft above sea level, and the temps this time of year are usually around 70ºf.
Any and all help is greatly appreciated!
-Sage
I have a 66/80cc china girl on my 21 speed Schwinn mountain bike, with SBP Expansion Chamber, HD Lightning CDI, RT Carb and better spark plug as the upgrades I have done to it. I plan to get a performance head when I have a little extra money to throw at it. I also had to replace the jug and piston due to a mishap with my throttle cable getting stuck outside the old carb and running the engine too high.
After taking it out for a test ride after putting on the upgrades but before swapping out the spark plugs, i noticed a small amount of 4 stroking, so I decided to swap the spark plug out for the newer one to see what would happen. After swapping it over the 4 stroking increased so I moved on to adjusting the jets. I have tried swapping out the standard jet(which was unlabled) from the RT for the #70 that came with it. I also have a 65/75/80/85 jets that I have not tried yet. When I put in the #70 jet there was very little power and it would not crank up when trying to get things going, so I am guessing I need to go up in size, but would like some advice before I go to far along.
As I know altitude can effect the running conditions I live at approximately 3300ft above sea level, and the temps this time of year are usually around 70ºf.
Any and all help is greatly appreciated!
-Sage