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Old 15-04-2009, 08:00 PM   #1
0187johnny1
 
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Pit bike backfiring!!

HI EVERYONE I HAVE GOT A THUMPSTAR PITBIKE WHICH HAS 2 PROBLEMS 1ST IS NOT RUNNING 100% AND THE SECOND WEN I REV THE BIKE IT KEEPS BACKFIRING !! I THINK IT IS SOMTHING TO DO WITH FUEL MIXTURE COZ I CLEAN THE SPARK PLUG PUT IT BACK IN THE BIKE STARTS IT UP THEN TAKE PLUG BACK OUT AND ITS BLACK AND SOOTY!! HOPE SOMONE CAN HELP?
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Old 15-04-2009, 08:07 PM   #2
mcglynn
 
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Re: Pit bike backfiring!!

your right, if your plugs sooty, then your misture is far too rich.
you'll need to adjust the mixture screw on your carb, which's area will depend on the brand of your carb, either a spring held screw on the side (VM) or underneath.

the plug should be sort of blacky browny, run too lean, and the bike won't run good (over heat).

Good luck.

EDIT:
In Future, try not to use caps ALL throughout your message, it gets annoying.
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Old 15-04-2009, 08:11 PM   #3
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Re: Pit bike backfiring!!

sounds good when they bac fire!! :P haha!! lol but... yeh idle screw ^^
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Old 15-04-2009, 08:12 PM   #4
evopitbike
 
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Re: Pit bike backfiring!!

Idle srew WTF no mixture srew .... back fire is normally jew to... too much fuel left over
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Old 15-04-2009, 08:26 PM   #5
_James_
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Re: Pit bike backfiring!!

Mine sometimes back fires when the exhaust is loose
So I'd check that aswell.
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Old 15-04-2009, 08:37 PM   #6
mcglynn
 
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Re: Pit bike backfiring!!

Originally Posted by evopitbike View Post
Idle srew WTF no mixture srew .... back fire is normally jew to... too much fuel left over
chillax, and spell 'due' right lol,

Originally Posted by Toby_Thump View Post
sounds good when they bac fire!! :P haha!! lol but... yeh idle screw ^^
Mixture screw my man
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Old 15-04-2009, 08:38 PM   #7
evopitbike
 
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Re: Pit bike backfiring!!

Sorry english teacher Y not just piss off . All you did was say the same thing as what i did T/T
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Old 15-04-2009, 08:39 PM   #8
elliott king
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Re: Pit bike backfiring!!

Originally Posted by _James_ View Post
Mine sometimes back fires when the exhaust is loose
So I'd check that aswell.
mine does exactley the same...when i had my xsport...when the end can was off it it didnt back fire once but when it is on it it intends to go bang bang blllurrrr like its bogging out...thats the pigs problem now
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Old 15-04-2009, 08:41 PM   #9
mcglynn
 
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Re: Pit bike backfiring!!

Originally Posted by evopitbike View Post
Sorry english teacher Y not just piss off . All you did was say the same thing as what i did T/T
take your tablets today son?
might want to, seem a bit 'fucked off'...
i was repeating what you said, as the convo was generally directed at me, so if someone's gonna try make a twat outta me, i'll rub it back into them

and im no english teacher, but due/jew, jus found it funny, and thoght cause you were correcting him with your internet balls, i'd do the same to you

have a good day
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Old 15-04-2009, 08:43 PM   #10
_James_
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Re: Pit bike backfiring!!

Spelling mistakes ^^
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