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Old 05-12-2013, 08:51 AM   #1
Stephen Daudelin OP
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Backfiring On Front Cylinder

HELP!!!! My 2006 950 Adventure is backfiring on the front cylinder! It was running fine when I put it away for the winter and now this. I took the carbs off and sprayed carb cleaner in them, changed the very dirty spark plugs, put it back together. When it started, it was running great for a few minutes with full compression coming out of both exhausts. Then it started popping and backfiring again on the front cylinder. You can see flames in the carb. Any ideas what it could be and what should I check????
Is it the valves?? An air leak?? Or what??
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Old 05-12-2013, 09:02 AM   #2
Katoom72
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Excessive lean condition? Check airleaks and fuel
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Old 05-12-2013, 09:10 AM   #3
DirtyADV
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Only time I have had flames come back up the carb one of the choke cables was not seated fully.



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Old 05-12-2013, 09:34 PM   #4
skianreid
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Check to see if the O2 screw in the pipe fell out.
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Old 05-13-2013, 09:31 AM   #5
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Maybe the coil is breaking down, is it heat related?

Other thing to check is spark plug to make sure no losse carbon found its way back into the gap post cleaning?

The only other obvious may be check the top of the coil connections to make sure they are not loose.
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Old 05-13-2013, 11:56 AM   #6
v303x
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Clogged pilot jet? Take the pilots off and use a strand of copper from a piece of cable to clean it. Spray them with carb cleaner and blow them dry with compressed air.

Better yet get new ones.

Cheers,

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Old 05-13-2013, 05:08 PM   #7
Racer111v
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I had the same problem with my new to me bike. The threaded tip of the spark was corroded (rusted) where it connects into the coil. The temperary fix was to clean up the end with some sandpaper and cover it with some dielectric grease. Then I bought new plugs and a used coil off Ebay. Of course I did all the carb stuff before I pulled the plugs.
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Old 05-13-2013, 06:55 PM   #8
Stephen Daudelin OP
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Thanks Gents!

I currently have new plugs, I've cleaned the carbs and jets.
Where is the O2 screw? It only occurs once it's warmed up. It runs fine when cold. It's certainly running lean.
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Old 05-13-2013, 06:59 PM   #9
Stephen Daudelin OP
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It's only got 20,000kms on it too.
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Old 05-13-2013, 07:12 PM   #10
Goss
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If the plug thing does not turn out to be the issue you need to pull the jets out of the carbs and clean them. This has happened to me a number of times over the years and I pull all of them and clean them while I have the carbs off.
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Old 05-13-2013, 07:13 PM   #11
Orangecicle
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I would bet that you have a vacuum leak on the front cylinder. Maybe a cracked boot. Maybe you didn't get the carb all the way into the boot. Maybe you have a vacuum line that is loose. I had this for many days and just couldn't figure out what was wrong, and then I found that one of the vacuum plugs I'd put on was blown off. That causes a super lean condition on one cylinder, and it will backfire into that one carb all day long. I'd put money on a vacuum leak.
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Old 05-13-2013, 07:36 PM   #12
Two Moto Kiwis
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You can buy a new tube of vacuum but make sure it is black

norsesweger (Tobi) had an issue with a cracked manifold boot per Orangecicle but that is a fair way in so simple stuff first.
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