Backfire on startup

[RodneyBR]

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My 2006 Kawasaki 650R backfires on start-up from time to time. Only happened a couple of time so far (bought bike a few weeks ago), but I'm wondering if this is normal, what causes it and is there a way of stopping it?

I thought if might be the 87 octane gas, even though that is the gas that's recommended for the bike, so I've filled up with 89 octane gas for the last couple of fill-ups. I haven't noticed it since, but this could just be coincidental.

Anyone else get backfiring at start up from time to time?

 

[rich6969]

no its not normal....A Back-fire or backfire is an explosion produced by a running internal combustion engine that occurs in the air intake or exhaust system rather than inside the combustion chamber. The same term is used when unburned fuel or hydrocarbons are ignited somewhere in the exhaust system.

 

[W8INLINE]

did you wash th bike before you fired it up? could be water in the exhaust

 

[silvrsurfr]

its funny - i have a 650r - and i could swear sometimes when i am actually riding and then when rolling off the throttle, i hear it back fire. But i could be mistaken and just simpy crazy. It could just be the engine noise. Its a very low muffled back firing noise if any.
I've heard some serious back firing in my time, and it doesnt sound like that - but its a little disconcerning.
I use 89

 

[apextech]

When's the last time you checked/changed your Air Filter Rodney?

 

[mikbusa]

its funny - i have a 650r - and i could swear sometimes when i am actually riding and then when rolling off the throttle, i hear it back fire. But i could be mistaken and just simpy crazy. It could just be the engine noise. Its a very low muffled back firing noise if any.
I've heard some serious back firing in my time, and it doesnt sound like that - but its a little disconcerning.
I use 89

650R has a really short exhaust system, decel pops are quite common.

 

[RodneyBR]

I'm always cleaning this and that, but no major cleanings.

did you wash th bike before you fired it up? could be water in the exhaust

 

[RodneyBR]

I only bought it a few weeks ago, so I have no idea, but should probably check.

When's the last time you checked/changed your Air Filter Rodney?

 

[Prince]

Seems like a common complaint on the 650R's. There's a fix for it here:

http://www.ridesonfire.com/answer-1/gas_gas-20110521151314AAQJzNZ.htm

 

[RodneyBR]

Since I changed to 89 octane gas no more backfiring on startup. I'll let yaz know if it returns. It's not like it was backfiring all the time anyway, just a few times, but still had me a little concerned.

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