thank you for the info fixed engine it had a broken lever on the underside of camshaft replaced with new cam started right up thank you again ronski36thank you for the info fixed engine it had a broken lever on the underside of camshaft
replaced with new cam started right up thank you again ronski36
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recheck the valve clearance when the engine is hot if it is hydraulic operated then thee will be an auto adjustment but it should be around .010 " when stationary and hot
Wasted spark system. If fuel and electrical is all good/correct it is often the case in these symptoms that motor cycle spark plugs that although looking good and firing outside of the engine are breaking down and will not fire under compression pressures on a power stroke but will fire unburned fuel on the unpressurized exhaust stroke when the plug again fires in a wasted spark ignition system and when so firing the result is a backfire, usually quite loud.
Check for spark at the distributor if no spark check or replace coil pack. also check to see distributor is turning while engine cranking, if not, possible worn out or broken gear tooth on shaft inside engine.
if distributor turns, check for burnt or worn out points and/or contacts on distributor cap.
Could be a problem with the cam or crank sensor, the ignition module, the plug wires could be on the wrong coil towers, or a fuel injector issue. Is the check engine light on when the engine is running ?
Hows the oil in it? also i would suggest spark plug sitting that long with gas inside the tank isnt good for any bike but it was good to drain. If its not spark plug check all basic engine problems than maby bring to mechanic it may need rebuilt.
You may have a bent pushrod or problems in the valvetrain, bent or burnt valves. May also want to check the cap and rotor. Normally a backfire thru the carburator can be associated with a mis-fire. How this gives you somewhere to start.
Double check all your vacuum lines and make sure none have come loose or were damaged when the engine was rebuilt. Check any egr, pcv, mass sensors and make sure they are clean etc...Not as familiar with Nissan trucks but some Nissan cars were equipped with an anti-backfire valve.
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