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Old 03-21-2014, 09:51 PM   #4
mr48chev
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Join Date: Jul 2007
Location: Toppenish, WA
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Re: trying to start for first time. Backfiring...

Quote:
Originally Posted by OrrieG View Post
Did you confirm that #1 was on the compression stroke?

Yep, How did you determine that you had #1 up on the compression stroke?

By cranking the engine over with the starter and letting compression blow against your finger in the spark plug hole?
By checking the rockers to see that both valves are closed and the timing mark is showing in the hole?

By rotating the engine by hand before the head on and getting the #1 piston to tdc and dropping the distributor in?

If it is #3 there is that chance that you had it on tdc on the exhaust stroke rather than the compression stroke and have it 180 degrees out.

I'd pull #1 plug (the front one) and crank the engine over with my finger over the plug hole to make sure that the rotor is actually pointing to #1 when you get it up on TDC. If it is go to step 2 which would be figuring out why it backfires only on the back carb. If it isn't, correct that issue and see if it starts.
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