DaveLikesToBike
New Member
I did a plug chop after warm up at WOT for about 2.5 miles with a NGK B7HS plug. The reading was lean, it was an ashy white. It runs smooth all the way up to 32-33 MPH. From everything I've found about problems with rich/lean most people have trouble with it being too rich at WOT and four stroking. I have the opposite which I find weird. I've read you rejet it to a bigger size to let more gas in but I don't know really what size is in there and what one to go up to. People say the stock size is either .70mm or .79mm in the 66/80cc engines.
So you can get a better idea, here's what I'm working with:
I have a 66/80cc engine, unknown manufacture because I bought it used. It's broken in and I run synthetic oil at 32:1. I use a .035mm plug gap. It has a NTTC carb on it which I believe is an NT. I've sealed around the clamp where it was letting air in. My stock intake filter fell off and was ran over by a car so I have a Sick Bike Parts high flow air filter on. I also added straight piping to the end of the muffler to get the exhaust fumes away from me while I'm sitting idle at stop lights, I kept the end cap on the muffler. I live at sea level in Florida.
One off topic question I had was: can a BMX 1/2 x 1/8 chain be used as the motor drive chain. I have a KMC Z chain that fits but I was wondering if they are strong enough to not break at high RPMS which would probably end up with me crashing?
If you can help me out with my problem or direct me towards a thread that answers my questions I would really appreciate it. Thanks for your help.
So you can get a better idea, here's what I'm working with:
I have a 66/80cc engine, unknown manufacture because I bought it used. It's broken in and I run synthetic oil at 32:1. I use a .035mm plug gap. It has a NTTC carb on it which I believe is an NT. I've sealed around the clamp where it was letting air in. My stock intake filter fell off and was ran over by a car so I have a Sick Bike Parts high flow air filter on. I also added straight piping to the end of the muffler to get the exhaust fumes away from me while I'm sitting idle at stop lights, I kept the end cap on the muffler. I live at sea level in Florida.
One off topic question I had was: can a BMX 1/2 x 1/8 chain be used as the motor drive chain. I have a KMC Z chain that fits but I was wondering if they are strong enough to not break at high RPMS which would probably end up with me crashing?
If you can help me out with my problem or direct me towards a thread that answers my questions I would really appreciate it. Thanks for your help.