80 backfires
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Joined: Feb 2006
Posts: 53
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From: Tampa Florida
80 backfires
Hello all hope all is good trying to start my 80 after new carb install she cranks turns over but she backfires and won't stay running can anyone give me some ideas thanks jr
Racer
Joined: Aug 2007
Posts: 267
Likes: 0
From: Springdale Arkansas
The only reason it should backfire is that it is lean...
or you are firing while and intake or exhaust valve is open.
Verify fuel supply
did you take any of the plug wires off for any reason???
if so check your plug wires
Best Regards, Jim
or you are firing while and intake or exhaust valve is open.
Verify fuel supply
did you take any of the plug wires off for any reason???
if so check your plug wires
Best Regards, Jim
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
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Melting Slicks
Joined: May 2003
Posts: 2,076
Likes: 281
From: Dyersburg TN
double check your plug wires if you replaced them. verify #1 on the compression stroke and firing order of the other plugs. even the best of us have mixed it up. Especially if the install happened long after midnight.
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
I had same problem, after clearing up fuel and timing, came to conclusion that my valves were too dirty. at least I hope this was the cause, took some time this week to clean valves and port heads and intake manifold. few more things to hook up tomorrow and give rtv time to fully cure, will know for sure tomorrow. may try adjusting valves to possibly save a bigger job of having to pull the heads.
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
I had same problem, after clearing up fuel and timing, came to conclusion that my valves were too dirty. at least I hope this was the cause, took some time this week to clean valves and port heads and intake manifold. few more things to hook up tomorrow and give rtv time to fully cure, will know for sure tomorrow. may try adjusting valves to possibly save a bigger job of having to pull the heads.
Racer
Joined: Aug 2007
Posts: 267
Likes: 0
From: Springdale Arkansas
whats your pig doing???
update, cleaning the valves did not fix it. next step, which I should have done when I had heads off and valves out, will be the springs. Been conversing with TimAT about my load and all the stuff I have already done. This hopefully will fix my pig.
driving beaters as a teenager has its advantages later on in life
Safety Car
Joined: Sep 2012
Posts: 4,688
Likes: 41
From: Palm Harbor, Florida
thanks.