robmac571
New Member
Hey guys,
Having some issues staring up my friends bike that we started building three weeks ago. I've built 4 bikes in the past and have been riding them for around 4 years.
One morning he was riding it back from class when it started to lose power and then completely died out. This was after 10 days of flawless riding with a 20:1 fuel ratio.
Knowing this, I immediately checked for a loss in compression, but all of his head nuts were pretty dang tight and his head gasket was not blown. His compression was still great, so it couldn't be that.
Next we checked his carburetor and cleaned it out twice, blowing some compressed air down the jet, and later mixing up a brand new batch of gas. That did absolutely nothing.
After that, I took a look at his electrical system. I unplugged the kill switch and checked for a spark--which there was--and then checked all the connections inside the magneto just to be sure. We tested everything for their respective resistance values which all fell within the boundaries.
At the moment, when he pedals heavily downhill with no choke, his engine fires every two seconds or so, not in quick succession like it should.
So what could the problem be? I have a hunch it might have to do with the timing but I have no idea at this point. Any help and suggestions are greatly appreciated!!
Having some issues staring up my friends bike that we started building three weeks ago. I've built 4 bikes in the past and have been riding them for around 4 years.
One morning he was riding it back from class when it started to lose power and then completely died out. This was after 10 days of flawless riding with a 20:1 fuel ratio.
Knowing this, I immediately checked for a loss in compression, but all of his head nuts were pretty dang tight and his head gasket was not blown. His compression was still great, so it couldn't be that.
Next we checked his carburetor and cleaned it out twice, blowing some compressed air down the jet, and later mixing up a brand new batch of gas. That did absolutely nothing.
After that, I took a look at his electrical system. I unplugged the kill switch and checked for a spark--which there was--and then checked all the connections inside the magneto just to be sure. We tested everything for their respective resistance values which all fell within the boundaries.
At the moment, when he pedals heavily downhill with no choke, his engine fires every two seconds or so, not in quick succession like it should.
So what could the problem be? I have a hunch it might have to do with the timing but I have no idea at this point. Any help and suggestions are greatly appreciated!!