Question about 2000 Suzuki SV 650 S

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Rear Cylinder Misfire

I have a problem with the rear cylinder misfiring, it only happens once the bike has warmed up a bit bit, and only happens at low revs.

I've checked the choke assemblies and they are not sticking, I'm presuming its not the air filter as that should affect both cylinders.

The carb is snugly in the inlet with no apparant signs of air leakage, am I right in presuming its probably a blocked low speed jet? When the engine is running at > 2500 revs the problems not there, and the engine maintains a consistent temperature. Below that it overheats very quickly and the problem re-occurs.

Some of the misfires will stall the bike, whilst the engine will recover from some of the others.

Any ideas?

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  • btasker Feb 01, 2009

    Hi, cheers but I seem to have solved it. After speaking to the garage that did the original restriction to see if they would normally adjust the mixture when doing it (I had the problem before I de-restricted it, but figured it may be two different issues manifesting in the same fault) they said no but asked if I had removed a white collar from the needle, turns out the collar wasn't there anyway but the clip on the needle wasn't in the standard position (not that I moved it at any point) so I reset it to standard and all seems well again.

    Why it didn't cause an issue before I don't know, but it was running the engine far too lean compared to the factory setting. I'm guessing the previous owner may have had an aftermarket filter and swapped it back before selling the bike to the dealers. Who knows?


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Yes the low jet cauld be the cause but have you had the valve clearance done seen a few close up on the ex..

Posted on Jan 31, 2009

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