Posted by Tom Fleming on August 23, 2013 at 04:43:10 from (67.20.233.75):
In Reply to: zeinith carb F20 posted by jmix on August 22, 2013 at 06:17:43:
Cowman is right on. one problem at a time. you very well could have 2 issues, but if there is good, hot, spark at the plugs, then you can move on. At times, these old girls can seem to be possessed by demons............but they aren't. One step at a time.
Spark, fuel, and timing: they will start and start easily.
1.) check for good spark, make sure wires are copper core and good contact. Make sure mag has good ground. Make sure points are clean and set right.
2.) fuel - make sure primer cups are shut or plugged. make sure carb is clean and good fuel flow. Ether is an option as well as Cowman states.
3.) Make sure your timing is set right. Not a hard thing to do. #1 on TDC on compression stroke. Mag impulse should trip at that point, not before, not after, but at TDC.
Unless there is something mechanically wrong (stuck valves, sheared key on cam or governor gear, leaky head gasket, wrong valve lash), it will start and run.
PS I once bought a mag from a guy who said he rebuilt it. Well, there were new parts: points, condenser, coil, and the inside was clean. However, he had the internal timing off by 10 teeth on the distributor plate. took me 2 days to diag that, and a dis-assembly of the mag. Not saying that is your problem, but also something to consider.
This post was edited by Tom Fleming at 04:47:16 08/23/13.
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