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OZ ATV :: The Australian ATV Forum
Australia's Largest ATV Forum
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yamahore
50cc nipper
Joined: 29 Mar 2009
Posts: 5
Location: perth
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 Posted: Tue Jun 30, 2009 12:43 am Post subject: yfz 450 2007 backfiring |
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hey guys bought bike s/hand, has started backfiring when i let off power from flat out in 3rd or 4th etc, just one loud bang, but sounds like it could do damage.........  i think the flame arrestor was removed from exhaust by my mate, other than that should be stock. any ideas would be appreciated.. also, wanted to take airbox lid off does this reqire bigger jets or more fuel etc? when i have done in past it has a flat spot on take off...
cheers carl |
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bigjon
Moderator
Joined: 17 Feb 2006
Posts: 1279
Location: Dubbo
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| Posted: Wed Jul 01, 2009 8:00 am Post subject: Re: yfz 450 2007 backfiring |
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| yamahore wrote: | hey guys bought bike s/hand, has started backfiring when i let off power from flat out in 3rd or 4th etc, just one loud bang, but sounds like it could do damage......... i think the flame arrestor was removed from exhaust by my mate, other than that should be stock. any ideas would be appreciated.. also, wanted to take airbox lid off does this reqire bigger jets or more fuel etc? when i have done in past it has a flat spot on take off...
cheers carl |
Too lean!
What year is it?
Also, anytime you do something with the intake or exhaust it will effect your air/fuel ratio. Particularly the YFZ450.
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Don't close your eyes during the crash, you'll miss the best part |
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Hudson
4fiddy Racer
Joined: 12 Feb 2006
Posts: 287
Location: This Week... Back in Texas
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| Posted: Wed Jul 01, 2009 2:48 pm Post subject: |
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Put a biger pilot jet in it. Should help the problem. Pete, what size do you think??
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You Can Fix Alot Of Things In This World But...
You Can't Fix Stupid!!! |
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bigjon
Moderator
Joined: 17 Feb 2006
Posts: 1279
Location: Dubbo
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| Posted: Thu Jul 02, 2009 11:03 pm Post subject: |
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If you wanted a starting point go with a 165 or 168 main and a 45 pilot.
_________________
Don't close your eyes during the crash, you'll miss the best part |
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