Bang!

I've got a curvy 650s, 2000 model.
Got a set of tyres fitted on wednesday, picked bike up on Thursday
I went out for a long ride yesterday to scrub the tyres in and my bike's been backfiring loads (obviously this has nothing to do with the tyres!!)
When I picked it up, the bloke said it was runny very lumpy and I should get it serviced (probably through them )

It doesn't backfire when I shut the throttle off, but when I'm accelerating and hit any sort of bump in the road..
Revs drop for a sec, then BANG (sometimes BANG BANG BANG )
Did it mid-corner and I nearly shat myself

Was running fine when I dropped it off on Wednesday
So what needs doing to get it as it was, before it was in the garage?
I'm guessing a carb balance? How much would a garage charge to do this?
Might be due an oil and filter change (which I should be able to do myself!). Could that be a contributing factor?

Also coincidently,? my alarm is now not working, but that's another issue

Thanks in advance,
Josh

[embee]

Sticking chokes?

Originally Posted by embee

Sticking chokes?

How do I check for that?


Thanks for the reply btw

If it is over bumps, sounds like it might be the sidestand switch or a loose connection on the coils, possibly one of the plug caps has popped off the top of the plug.

You can get to the front plug cap easy enough ... give it a push down to ensure it is seated correctly

Originally Posted by Blue_SV650S

If it is over bumps, sounds like it might be the sidestand switch or a loose connection on the coils, possibly one of the plug caps has popped off the top of the plug.

You can get to the front plug cap easy enough ... give it a push down to ensure it is seated correctly

Cheers Blue, hadn't thought of that

*off to give it a push*

[yorkie_chris]

Loose connector.

I had something similar.

It was my reg/rec and a knackered battery.

Get a multimeter and check it is not charging up and 20v etc.

When my reg/rec went the bike felt less responsive and then would backfire loads a mate said he could see flames from the exhaust.

I have a new reg/rec with fan and I have never had a problem again.

Originally Posted by ricky_t

I had something similar.

It was my reg/rec and a knackered battery.

Get a multimeter and check it is not charging up and 20v etc.

When my reg/rec went the bike felt less responsive and then would backfire loads a mate said he could see flames from the exhaust.

I have a new reg/rec with fan and I have never had a problem again.

Thanks. I will borrow a multimeter tomorrow and test it.
How would the battery being knackered make it backfire?


EDIT: Just realised I can't check the reg/rec with the engine running.. my alarm has decided to pack itself in.. the fobs aren't doing anything, so I can't mobilise my bike

Anyone got any suggestions?
I assume you need the engine running to check the reg/rec

Could be a wire earthing itself...

EDIT: It won't/shouldn't be the reg rec...all electrics would die, on my black sv i used to be able to flash the lights and make it backfire I can see where that may come from but i'd say it wouldn't be that josh.

I had a similar problem to this not so long ago, and I know it sounds wierd but it ended up being the stand switch and front brake light switch. It was causing a short on the ignition circuit and causing the bike to cut out every so often, more often in the wet first of all then did it all the time until it kept on blowing the ignition fuse as soon as it was started. I replaced both of these and haven't had a problem since, been running fine now for 2 weeks with out a hiccup.

I hope that this helps