Back-fire fix - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

 
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post #1 of 2 Old 03-20-2013, 05:07 PM Thread Starter
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Join Date: Jan 2013
Location: Vancouver Island, BC, Canada
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Back-fire fix

Hey gang, thought I'd pass on this fix I did the other day. After doing the dynojet kit [ #155, 3rd slot, 2.5 screw ] and a free-flow can [ Hindle Stealth ] I just had a wicked backfire to deal with. Finally got advice on the phone from dynojet to plug the fresh-air feed to the exhaust port [ haven't seen that anywhere, including the instructions with the kit! ] so put a rubber bung in the intake side of the 1-way valve and problem gone! A little loud but lots of grunt. Ride on -

1973 Norton Commando 850 [ since '82 ]
.040" over - mikuni 34mm - dual fire single coil

1993 Harley heritage softail [ since '03 ]
S&S 96" [ in '10 ] - V&H Pro-pipe

2011 KLR 650 [ Dec. '12 ]
EM Doo w/ torsion spring - Hindle stealth muffler -
dyno-jet kit - snorkel & L-mod - T-bob.
Various Japanese & British since '71 - Ride on!
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post #2 of 2 Old 03-20-2013, 06:57 PM
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Originally Posted by Threebike View Post
Hey gang, thought I'd pass on this fix I did the other day. After doing the dynojet kit [ #155, 3rd slot, 2.5 screw ] and a free-flow can [ Hindle Stealth ] I just had a wicked backfire to deal with. Finally got advice on the phone from dynojet to plug the fresh-air feed to the exhaust port [ haven't seen that anywhere, including the instructions with the kit! ] so put a rubber bung in the intake side of the 1-way valve and problem gone! A little loud but lots of grunt. Ride on -


Backfiring is a lean condition so yea you fattened up the mixture by removing the air injection. The bike is lean stock so I'm thinking that the dynojet kit made it even leaner. The muffler shouldn't have had much effect on jetting.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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