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Post by growingrass on Jul 12, 2012 13:42:12 GMT -5
This happened a little after i installed a new spark plug. When i hold it at 3/4 or full throttle for a little while and then let go of the throttle all together the engine backfires. Do you think i need to change the gap on the spark plug? or could it be something else?!
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Post by skuttadawg on Jul 12, 2012 13:47:04 GMT -5
Lean misfire . Install a larger main jet
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Post by nitroman666 on Jul 12, 2012 14:51:01 GMT -5
When you say a "little after". Exactly how long. Also, a hole in the header pipe or exhaust can cause a backfire. Check or replace your exhaust gasket. It's not the best thing to do, but with it running, plug the exhaust tip to see if you hear any leaks. This has been my experience. I had a major backfire, 12" Flames, and it was a crack in a weld where the header met the muffler.
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inuyasha
Scoot Enthusiast
Retired Master Chief USN
Posts: 471
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Post by inuyasha on Jul 12, 2012 16:03:11 GMT -5
Hi
Here are possible causes:
1. Low Idle.
2. Exhaust Gasket.
3. Leaking Carburetor Intake Boot.
4. Leaking Vacuum Hose.
5. Pilot Screw.
6. Air Cut-off Valve.
7. Enrichening The carburetor jetting.
Hope this helps
Take care and ride safely
Yours Hank
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Post by Fox on Jul 12, 2012 20:25:32 GMT -5
You left out: bad plug
Just cause something is new doesn't mean it's good. Check the spark plug for a cracked porcelain.
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Post by growingrass on Jul 13, 2012 10:41:03 GMT -5
Thanks for all the suggestions guys!
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Post by craig on Jul 13, 2012 12:33:11 GMT -5
Hello check the valve clearance at maximum tempetature and also for play on the timing chain.
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katastroff
Scoot Member
Dont F*%$ With Me, I'm a Dad!!!
Posts: 67
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Post by katastroff on Jul 13, 2012 17:39:25 GMT -5
When mine was brand new, it used to do that too. Removing the anti-pollution kit solved the problem.
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Post by bluesi808 on Jul 13, 2012 18:02:22 GMT -5
I had the same problem after I upgraded my exhaust and bore, it was a quick fix. My exhaust bolts rattled loose and it was leaking from where the engine meets the exhaust. I have to retighten it weekly
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Post by vegaslightsss on Sept 23, 2012 22:44:56 GMT -5
Pops on Acceleration ,usually an intake leak
Pops on Deceleration,Often an Exhaust Leak
If you have a propane torch ,open the valve just slightly and pass it closely over the intake boot,carb clamps,vacuum lines,ect. If you have an intake leak of any size the Engine will race when the propane (from the unlit torch) is injested....Vegas
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Post by bootscooterboogie on Sept 24, 2012 2:26:03 GMT -5
Well, I think you're also discounting the possibility that he was under gunfire from rival scooter gangs... Do you live in a bad part of town? Were you wearing scooter gang colors?
:bfg:
:lol2:
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\\-olf
Scoot Enthusiast
Iowa
Posts: 304
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Post by \\-olf on Sept 24, 2012 20:05:11 GMT -5
I know what happened, all the other old parts didn't LIKE the new guy you tossed among them- the NEW spark plug! they decided to display some resentment about it, so the lesson to be learned is don't replace parts with new stuff  |
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