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Apr 27th, 2009, 03:14 AM
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#1 | | Newbie
Join Date: Nov 2005
Posts: 5
| Backfire
what causes backfire and sputtering on 3/4 throttle? 
1200 sportster spoort, 4 plugs ,2 ignition coils, 2003 | 
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Apr 27th, 2009, 07:38 PM
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#2 | | Moderator Has posted 500+
Join Date: Jul 2005
Posts: 7,411
| quite a few things will cause those problems......need a bit more info........
also your factory service manual has a trouble shooting guide in it.....best tool in your tool box!!!!!!!
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Apr 28th, 2009, 08:31 AM
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#3 | | Has posted 500+
Join Date: Jun 2004
Posts: 3,097
| I would bet you have something shorting,
Check grounds on battery to frame be sure you have a good connection.
Check all other connections as well including the plug wires and the plugs for damage, there can be slits in the wires that you can't see with your eyes at a glance, pull them and check each inch by inch look for a cut that could open under hard throttle and arc the plug
If you have chrome plug covers to make the plugs fancy, remove them, I've seen them touch the engine under hard throttle and cause the bike to misfire under acceleration (mine are in a field somewhere outside daytona after I found them doing this lol)
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Apr 28th, 2009, 10:11 AM
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#4 | | Moderator Has posted 500+
Join Date: Jul 2005
Posts: 7,411
| hrk, i bet there near where i threw my "neon glow every time the spark plug fires boots".....................lol lol
__________________
LORD, HAVE MERCY ON AMERICA, WHILE WE ARE UNDER DISTRESS
"FLAGS AND HANDLEBARS SHOULD NEVER TOUCH THE GROUND"
"Lord, hold our troops in your loving hands. Protect them as they protect us. Bless them and their families for the selfless acts they perform for us in our time of need. Amen." We plan to meet next week to talk about planning a strategy session to discuss the next step towards forming a consensus to start the development of the rough draft for the implementation of our intention to develop a plan. | |
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