Quote:
Originally Posted by Ariel Red Hunter
I understood that the built in timing advance was only capable of a very small amount of advance. I have been given to understand that initial timing is already set at 14 degrees before TDC. I would think that any more static advance would create starter motor problems. One thing I can think of to get around that problem would be to let the electric starter bring the engine up to starting speed with the ignition off at the red switch. Then when the engine reaches maximum rpm on the starter, push the other red switch. If that works, but is awkward, put a push button magneto grounding switch on the left handlebar....ARH  |
We aren't talking enough advance to really put any actual strain on the starter. If the idle/start ignition timing is 14*BTDC, with the peak advance being 26*BTDC(est)@4000rpm, and I manage to advance the pickup say 2 degrees, then we are talking 16*BTDC starting/idle with 28* at 4000rpm.
Considering most of the "performance" CDI units on the market have zero idle/start ignition retard built into them, they have the engines kicking over with 26 degrees of advance just to start, which is why they are such a pain in the rear end to cold start.
My modified head on the other hand... that will definitely make my starter cry a little bit. I calculated out my compression at 10.3:1 That might do a number on it lol.
The pickup advance modification is more of just an experiment to see if I can coax a little more pep in it's step in the middle of the power curve. Since I only plan to slot the bracket holes in the direction needed to advance it, I can always take it back to the factory position if needed. I do plan on eventually tossing on a programmable CDI though, as full control over the whole curve would be wonderful.