Hit a bump, Engine Cuts, Backfire, then fine

[micklm]

Hi all,

Problem is sorted but thought it might give some folks a laugh.

Had the 906 for a few months now and it runs pretty well. Then suddenly everytime I hit a decent sized bump in the road, the engine cut out, then backfires and then is fine.

Having been through a lot of the excellent reference material here before I bought the bike, I started having nightmares about electrics and float settings and various other carb problems (I have an active imagination).

Started looking at the simple things first and for once it was a simple thing. The positive terminal screw on the battery had worked its way loose over time. When I hit a bump it must have broken the ignition circuit momentarily, putting unburnt fuel into the exhaust for the next cycle! Boom.

Maybe I do have an underlying electrical problem to find (knock on wood), but for now, tightening up the battery terminal has completely solved the problem.

Tools away, carry on riding.

cheers,

Mick

[Finnpaso]

Mostly of those backfiring problems are coming from that Weber carburator, so You have to tune it first... When i had Weber in my 750 paso, it "backfired" quite often, then i changed to Dellortos, not anymore .... and later to Mikunis, not anymore backfing...

[higgy]

backfiring with the weber if it is the cause and not some intermittant electrical issue can be resolved by raising your idle jets a size or two to richin up the mixture(more fuel,less air)

[micklm]

Hi all,

For now it seems to be solved and I'm not keen to touch the weber while it it working well! Definately was only backfiring whenever I hit a bump and no other times. And hasn't happened again since....fingers crossed!

cheers,

Mick

[timmetje]

hi mick,

i had the same a while ago, only when i hit a bump, turned out to me a loose connection at the battary. no big deal.

[jomo]

Mick, keep looking for that loose battery terminal or similar. Carbys are not sensitive to bumps. Last time I had that problem was the battery terminal and it killed my clock.