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09-18-2009, 01:02 AM
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#1 (permalink)
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Junior Member
Join Date: Sep 2009
Location: Washington
Posts: 13
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Backfire, chortle, popping
New rebuilt motor: compression backing off and starts popping, chortle and etc. Exhaust still stock with inserts removed. Still using crossovers. '01 heritage Didn't do it before rebuild.
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09-21-2009, 09:14 AM
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#2 (permalink)
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Junior Member
Join Date: Sep 2009
Location: cape coral fl.
Posts: 7
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carbed or efi?
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09-23-2009, 06:03 PM
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#3 (permalink)
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Enthusiast
Join Date: Sep 2009
Location: So Cal
Posts: 7
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If its carbureted, try richening the idle mixture a little at a time.
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10-06-2009, 02:54 AM
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#4 (permalink)
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Junior Member
Join Date: Sep 2009
Location: Washington
Posts: 13
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Quote:
Originally Posted by springer1
carbed or efi?
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efi, rebuilt motor |
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10-06-2009, 02:55 AM
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#5 (permalink)
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Junior Member
Join Date: Sep 2009
Location: Washington
Posts: 13
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efi, rebuilt motor
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10-06-2009, 02:56 AM
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#6 (permalink)
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Junior Member
Join Date: Sep 2009
Location: Washington
Posts: 13
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Quote:
Originally Posted by Smoker03
If its carbureted, try richening the idle mixture a little at a time.
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EFI, rebuilt motor, mapping the same |
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10-06-2009, 08:40 AM
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#7 (permalink)
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senior citizen
Join Date: Jun 2009
Location: Port Washington , WI
Posts: 700
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Quote:
Originally Posted by Harley5212001
New rebuilt motor: compression backing off and starts popping, chortle and etc. Exhaust still stock with inserts removed. Still using crossovers. '01 heritage Didn't do it before rebuild.
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Not enough info from you ... can't diagnose from the symptoms you described . |
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10-07-2009, 01:02 PM
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#8 (permalink)
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Junior Member
Join Date: Sep 2009
Location: Washington
Posts: 13
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backfiring
Quote:
Originally Posted by SCHMIDTYS
Not enough info from you ... can't diagnose from the symptoms you described .
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Motor totally rebuilt. Runs great except when backing off throttle the exhaust starts compression backfiring, popping. Going down hill at 40 in third gear with no throttle. I've heard it could be air leak? and also a valve hanging up in guide? How do I check valve in guide? It is EFI, 2001 twin cam. New everything inside. |
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10-07-2009, 02:47 PM
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#9 (permalink)
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Mentally unstable.
Join Date: Jun 2008
Location: Pennsyltucky
Posts: 6,627
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Quote:
Originally Posted by Harley5212001
Motor totally rebuilt. Runs great except when backing off throttle the exhaust starts compression backfiring, popping. Going down hill at 40 in third gear with no throttle.
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Ahhhhh....new info. No...not a valve guide, rather you're running lean.
You need to richen the fuel mixture up, or check for an exhaust leak on the rear pipe, if that's the ONLY pipe that's doing it.
If you're running too lean, it can do the same thing, but it's generally on BOTH cylinders, not just the rear one. Just having ONE cylinder do it sounds as if it's as simple as locating an exhaust leak at the head, or ar the pipe/muffler union.
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HERD meber #10
DISCLAIMER: Any information, advice or child raising tips I give on this forum should be taken with a grain of salt, 8 hours sleep and at least 6 beers.
Following my instructions will likely lead to death, mental retardation and/or bodily injury, consistant with eating lead-based paint chips, and by doing so, will release me, my family and my dog from any legal action(s) for listening to anything I recommended. 
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10-07-2009, 05:06 PM
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#10 (permalink)
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nitro freak
Join Date: Jul 2009
Location: bloomington,in.
Posts: 111
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not a valve guide/valve prob,ive heard guys say that for ever,a valve isnt going to "hang up in a guide",then free up,once a valve seezes in a guide,motors spining so fast,the damage is done,its stuck,bent valve.you could have a ex. leak or its too rich way on the bottom and dumping raw fuel into the pipe,when this happens on a efi bike(like with a power commander,you zero out the first column,same princible with a carb,check you air/idle,lean it out a bit
kirby
vee twin racing
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