Gen 3: 2008-2010 Backfires into airbox - Kawasaki ZX-10R.net
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post #1 of 9 Old 10-15-2015, 01:12 PM Thread Starter
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Backfires into airbox

Has anyone had this. On startup the bike backfires into the airbox Then pressurized crankcase and blew camcover gasket out. Any ideas would be appreciated.

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post #2 of 9 Old 10-15-2015, 02:35 PM
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I did that once... Too much tequila at a Quinceañera. It was ugly
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post #3 of 9 Old 10-15-2015, 06:08 PM
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Sounds like it fired 180deg out, could be crank or cam sensor.
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post #4 of 9 Old 10-15-2015, 11:24 PM
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Obstruction in exhaust...my guess
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post #5 of 9 Old 10-16-2015, 11:34 AM Thread Starter
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backfires into airbox

Sorry I know its the second post. Has anyone had this. On startup only the bike backfires into the airbox Then pressurized crankcase and blew camcover gasket out. Runs fine other than that. Only happened twice over race weekend. ideas would be appreciated.

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Last edited by oldkamikaze; 10-16-2015 at 11:37 AM.
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post #6 of 9 Old 10-16-2015, 01:41 PM
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I've merged the threads. There's no reason for the second one.

How would backfiring into the airbox cause the crankcase to over pressurize? A "back-fire" is usually a constant flame propagation out of the combustion chamber back up through the carbs (throttlebodies for fuel-injected systems, but it's very rare for that to happen). It's usually not a "pop" as much as it is a quick burning flame.

From what you're describing, the flame propagated out of the combustion chamber, up through the throttlebodies, and instead of the pressure escaping out the massive ram air duct at the front of the bike, it went back down through the 3/4" crank breather line, pressurized the crankcase, and then back up through the cam chain tunnel to pop the valve cover gasket. Is that what I'm reading you think happened? Sounds really far-fetched. Not saying it couldn't happen that way, but it's not plausible. I'd expect you to blow the airbox apart first or the pressure to go out the front of the bike before it had any chance of overpressurizing the crankcase and popping a valve cover gasket.

So, do you have a leaking injector? One that allows fuel to go to one cylinder while it's sitting for awhile? And then on startup, it ignites the raw fuel and the flame goes back up the intake track? The valves should be closed in this instance so I'd be inspecting the fuel injectors and the valves not sealing properly as the first thing. It may also be a bad or intermittent crank sensor or camshaft sensor as well as already stated.

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post #7 of 9 Old 10-16-2015, 02:19 PM Thread Starter
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Thanks for merging the two I didn't know which thread to put it in to get the best result. Its not a bang like you would get from the exhaust but it is a good pop. Why it would go down a 3/4 inch tube and not out the ram air inlet I have no idea. But that was the only thing I could come up with. All I know is that there was enough pressure under the cam cover to blow out a two inch piece of the gasket. I will check the crank sensor and see if the injectors are leaking. Thanks for all your help and time. At least it gives me somewhere to start.

Last edited by oldkamikaze; 10-16-2015 at 02:24 PM.
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post #8 of 9 Old 10-16-2015, 04:17 PM
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As mentioned by other members.

It could be a number of different things causing this. Sounds like a misfire.
Could be a bad injector. Could be a timing issue. You will have to bring to
a reputable dealer/mechanic. Have you ever had the bike tuned up?

2008 ZX-10R (modified)
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post #9 of 9 Old 04-17-2017, 01:12 PM
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Did you ever find the problem? Mine is a 2010 14k miles backfired and blew valve cover gasket after it cooled down after a long ride and I started it it popped and started leaking oil out of the valve cover gasket blew the whole back end of the gasket out. Trying to find the problem before it happens again thanks
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