well its winter and time to solve the ping issue with my 72 its a 74" and really pings on start up and warmer weather.I have tried octane booster and still have problems with the ping.thought about a hotter coil but just guessing at this point....any thoughts out there...thanks

 

I'm not an expert but maybe I can give some free advice. Timing could be an issue. Mechanical advance unit worn. Condenser could need replaceing. Retime and see if that might help. Good luck.

Stubby1959

 

Have you checked to see what the compression is? Does it have high compression pistons? How long have you owned this bike? It sounds like the wrong cam was installed to run with high-compression pistons. Give a little more background on the bike if you don't mind.

 

A hotter coil, different plugs, etc. will probably do nothing for you. What kind of ignition does it have? does it have dual plug heads? what's the comp. ratio? What octane fuel are you feeding it? Unless you can answer some of these questions, there isn't much we can do to help. If it's all stock, stubby may be on to something. Check the advance unit and the springs. If the springs broke or the advance isn't returning, full advance can definitely give you a ping at low speed

 

its all stock 74" I have had this bike for about a 18 months I have changed the points and condensor but I did not check the advance weights and springs so thats where I will go next.. thanks

 

Anytime you change points, or more particularly the gap setting, the timing changes. If the contact heel of the points wear causing the contacts to be closer, the timing will retard. If the points are gapped wider than when the timing was last set, the timing will be advanced (from the previous adjustment or setting). Generally speaking, when new points are installed and properly gapped, you set the timing and as long as the correct point gap is maintained, re-setting the timing is unnecessary.

So, adjust the (new) points correctly then check/adjust the timing per the manual. Until you've done that, you won't have a starting point from which to diagnose any other possible problems causing your ping.

 

will do t150,thanks for the info.

 

T150 is right, but if I were you, I'd pull the advance unit out and clean and lubricate it first anyways, and check the springs. It's something that should be periodically done, and if you haven't done it and don't know if it was ever done, then even if it's working OK now it may start to give you trouble soon. it's right behind the points plate, just take the points plate off and undo the bolt that holds the points cam on, and the advance unit comes right out. just don't overtorque the bolt when you put it back on, it is quite fragile and will break easily!

 

did just that yesterday,hopeing to get some new springs today. it was a little gunky but not to bad and I think the spring where a little worn Idont think they where letting the weights snap back all the way,,thanks for all the response guys!!