Re: Got it together, now a question
Posted: Tue Jul 12, 2016 12:45 am
Dave
Nice progress!
The common problem with the advancers is that the neoprene buffers on the balance weights deteriorate to give you much more 'advance' range than you need. Also the pins and holes where the springs fit can become loose.
This all results in a rapid over-advance of the timing. You can check this with a strobe light and back off the timing accordingly if the advancer is in not too bad a shape. The timing light will save you having to strip th etop end is a better indication than just looking at the parts.
You will end up with a static timing that is off but something that will work better as the engine speeds up.
Another thought - have you got the carbs jetted correctly? I notice no air filters.
G
where the
Nice progress!
The common problem with the advancers is that the neoprene buffers on the balance weights deteriorate to give you much more 'advance' range than you need. Also the pins and holes where the springs fit can become loose.
This all results in a rapid over-advance of the timing. You can check this with a strobe light and back off the timing accordingly if the advancer is in not too bad a shape. The timing light will save you having to strip th etop end is a better indication than just looking at the parts.
You will end up with a static timing that is off but something that will work better as the engine speeds up.
Another thought - have you got the carbs jetted correctly? I notice no air filters.
G
where the
dave_c wrote:Hi everyone,
Jumping ahead a bit here, but I've got the thing pretty much fully assembled, wired, oiled and fueled. Maybe later I'll tell you about my wheel drama, trying unsuccessfully to make exhaust headers, and various other steps along a crooked path.
I'm having a strange problem with ignition timing. I set the static timing and that seems to be right on. The bike starts and idles well. The problem comes when I try to give it throttle - it almost looks like the timing advance mechanism is working in reverse. It stumbles and eventually fouls the plugs if I try to open the throttle at all. Wondering if anyone has a clue - could there be something assembled backward? My next move is new points and condenser. After that I'm thinking I'll have to pull the engine so I can open up the top end and confirm the advance mechanism is assembled properly.