Posted by JRSutton on December 04, 2011 at 14:20:45 from (75.130.109.233):
In Reply to: M still not running posted by M Diesel on December 04, 2011 at 14:02:57:
If your checking each plug for spark, and you're 100% sure on the timing hitting at the top of the compression stroke...
That leaves valves, compression, and carb as likely suspects.
Compression check will tell you if your valves, head gasket, and rings are sealing well enough to fire.
I'd keep an eye on the valves as you're testing just to be 100% sure they're all moving properly and not doing anything crazy.
Assuming the results are ok -
Then you're down to the carb.
Rule out flooding - shut the gas off to the carb completely.
Pull the plugs one more time and make sure they're clean and dry, put them back in.
Keep cranking it for a while - stop a minute - try for a little more - stop - try again. Do that over 10 minutes or so.
It'll either start for a bit at some point, or do nothing but run your carb fairly dry.
If it DOES try to start at all - you know you've been getting too much gas through the carb and can go from there.
If it doesn't make any difference at all, once you're sure the carb is emptied out enough, try some starter fluid.
If you can just get it to fire even for a couple of revs that way, you can be pretty sure it's a carb problem - possibly flooding, or even not getting enough gas through the carb.
At that point, you can start diagnosing the carburetor, but cross that bridge later.
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