Poor running when hot, backfiring.

Hi there.

I own a curvy sv650 and am suffering some problems with it and cant seem to find the problem.

When the bike has warmed up and i start to open it up the revs judder and jerk alot, the bike backfires and the rev counter flicks about all over the place.

I've consulted all my local bike mechanics (in Hull) and have tried a few things to rectify this problem with no luck.

I have: Check all the wiring, checked the carbs, checked the ECU, replaced the pulse generator & crank sensor and regulator rectifior and i have replaced both coils too.

Has anyone suffered any similar problems or have any idea what the cause of this issue could be? I would be very grateful if anyone has some suggestions that might help as this problem has been present for a while now and im starting to run out of patience & money


TIA

Ian.

[dirtydog]

I had something similar and it was down to loose battery terminals

[Airwolf]

sound like a stuck or broken choke cable...

but i'm sure someone might have a better idea later........

sounds like choke tops to me had this with another bike of mine easy to fix as well a clean and grease should do it

thanx alot, i will give it a try and i will let u know wat the out come is,

hi guys ive tried the ideas with the bike but got no joy out of it, it is still playing up but thanx for helpin me , but im more then open to any more ideas you guys have or anyone on the forum thanx alot

[flymo]

Does it idle ok?

[Biker Biggles]

Have you taken out the choke plungers where the cables enter the carbs?These stick,causing a rich mixture which makes it run like a pig when hot.

[Binky]

I had a similar problem on my curvy. I had a loose connection from the earth. One of the connector pins was bent and only intermittently produced a complete electrical circuit.

This caused the bike, every now and again, to backfire, have the rev counter go mental even though at a steady throttle. The lights also flickered and the dash went crazy.

Try checking the electrics and looking for bent connectors. Spray them with water repellent.

Originally Posted by flymo

Does it idle ok?

ya it will start fine but as it gets up to temp and u open it up its runs like a dog,
but usualy it wont start if it does cut out, then if u give it a while till u start it up again it idles like nothing was wrong