So I have a 1996 Suzuki Savage LS400. Same exact thing, save engine size, as the LS650 in the States. First motorcycle I've ever had, period.
Anyway, it was sitting for maybe a couple of months when I went to go start it. Battery was weak, it cranked slowly, but didn't start. I went to get pull the battery out, when I noticed the way wrong size battery was in there.
So I got the right size battery and installed it. Didn't bother to charge it because it was a good enough voltage and a fresh battery. Still didn't start, but at least it sounded solid when cranking.
Tried to push start. Nothing. Hooked it up to a car. Nothing.
Took out the carb float bowl drain screw. Fuel is at least getting to the carb. Held my hand up to exhaust and some kind of air is coming out, though I don't know if that is an indication of good sparkage or not.
I'm too lazy right now to take the stuff apart to take a look at the spark plug, but is that a likely candidate for a fault, or could it be something more with the carb? Anything else I should be checking?
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Strip it, clean it, take this opportunity to put a carb rebuild kit through it, and put it back together.
After you check the plug.
Seconded. Although a carb rebuild kit may not be entirely necessary (it never hurts though).
Check the plugs first, and make sure you charge that new battery up as well. It may be cranking fine now, but new batteries rarely come fully charged, and you run the risk of reducing its capacity by running it down with all these start attempts.
Hooking a bike up to a car can be risky. If you do it (which you probably already know) never turn your car on. It will jump just fine with the car off and if you turn the car on you may blow your electrical system on your bike. I jumped my bike many times with my car and never had any problems so ymmv.
If you've got your carb in pieces, cleaned and waiting to be put back together, you'd have to be a silly goose not to spend the $10-$15 and put a rebuild kit through it whilst it's in that state already... It'd be like completely tearing down a used engine and not spending a couple hundred on a rebuild kit while you were at it.
Then you know it's perfect, and will be for some time yet.
Need to fix my speedometer while I'm at it.