Simple tip when tuning

[colonpee-:P]

Just a simple tip when tuning, timing, syncing carbs that many overlook when having problems like I was having, I had a lean plug on one bank, no idle screw response, bike ran well but had uneven power or a miss on one cylinder, before looking into tearing apart carbs, jetting, etc... there is usually a real simple explanation: 20-30 year old advance springs. More than likely these are the culprit as one may be worn/stretched causing an imbalance in the cylinder timing and appearing to be carb synch problems etc... make sure to check these first!!! Maybe this could be a sticky reminder!

 

[rockcitycafe]

a mismatch in spring tension won't change the relative timing of each cylinder, it will change the overall timing, both cylinders will still have the same number of degrees between firing.

 

[colonpee-:P]

True, in my case a spring was strecthed, causing one cylinder to have more advance than the other before full advance.

 

[rockcitycafe]

nope.

the advance cam controls the opening and closing of each point, both springs are locked into the advance cam, all one spring being stretched was doing is to allow the cam to move to the full advance position sooner than normal, but both cylinders are being advanced at the exact same rate. fix the spring, but look elsewhere for your problem