Alrighty, getting the bike ready for spring this weekend and I'm chasing a similar problem that comes and goes.
Rejetted Carbs, for the thinking it might be the problem, didn't really change anything.
The one cylinder will carry the bike 1.2k RPM pull it bike dies. We will call that the good one.
The Bad one will start the bike if given some throttle and stay running until no throttle is applied it then back fires or something exhaust out of carb intake, and dies.
Pretty much have it troubleshoot down to an ignition timing problem, however the problem is you can't adjust it.
Bike is stock as far as I know 1990. Swapped pick up coils and starter coils so it ain't that. Possibly IGNIT unit it's self but I'm sure they are expensive and I don't know anyone with a GS 500 that I could swap it with. (In Edmonton,Alberta,Canada) ** did your connector check Kerry all ohms out good.
Any ideas? Thoughts?
I'm thinking it's timing and it's sparking at the wrong time, and can't keep and idle because it's sparking at the wrong point on exhaust or something.
** This has been a reaccuring problem with this bike, it happens now and again, works great for a month then runs like garbage (one cyl) then I change spark plugs fiddle around, it will run again for another month. Season is pretty short up here so I'd like to get this thing running right. I've even had it out and it will be running on 2 then bogs down to one then click back to two then back to one and it's like riding a bull. Which is pushing me towards the IGN box, but I've been wrong before.
Regards,
Arlof
Ha Ha ... 1 word ... OK 2 words auxilliary ground ...
The battery has one big fat cable from the negative post going to ground and one skinny cable that sems to piggy back on that and goes somewhere into the wiring harness ... any trouble here and one cylinder will cut out ... feeling just like a black box or ignition issue ... The thing is on one bike I had ... a 92 it was the left that was dropping, on another ... a 95 it was the right ... and Didn't fall prey to it more than those 2 ... They happened after I dropped a sealed battery in them sideways ... that was tugging at that line just enough to lose connection ... solution ... take that connection apart and twist one of the connectors to make better contact ... or route it so its not a tight wire ...
Cool.
Srinath.
i had the same problem for a while. never really figured it out. i swapped plugs from the left and right cylinders and put in some fresh gas and it went away. it's still a mystery.
Clean the connectors in the wire harness and check the spark plug wire for continuity.
I'm having this problem from time-to-time ... but get this :
It most often happens in the RAIN !!! :dunno: BLOODY HELL !
And it feels like you only have a tiny fraction of power and can barely move, right ? ...
Yep,
I'm this close to putting a :guns: a bullet until this thing. Well I check the aux ground and believe it or not one of them was disconnected... aligator clipped the ground. Start getting pumped to go on a ride. After putting everything back on turning on the gas go to start it up... and it starts but I the throttle doesn't work. It's hooked up I assure you I throttle it by hand to make sure NOTHING.. it runs fine idle and all but when I turn the throttle by hand or by twist grip nothing a slight change in sound but nothing been trouble shooting for like 2 days now, like honestly no throttle how does that happen?! and the damned bike idles for christsake. Also it was throttling before when it was running on the one cylinder or two intermitently. Took the carbs all apart and everything twice already all the pieces are in place it has gas.
Any ideas?
Regards,
Arlof
OK you may have fuel ... but floats set high in 1 cyl ... My first check, as is rips in diaphragm and maybe a stuck diaphragm ...
Cool.
Srinath.
Hello, Again
Now that I can take this carb apart blind folded like a GS marine or something this is what i've found.
Two circuits in the carb.
Idle Circuit - Works fine the two intakes for fuel and air are in the bottom of the air intake cones. If I plug them with my thumb the bike dies from idle
Rev/Throttle Circuit - Uses main pilots and the needle in the diaphram to control gas flow. Diaphram's are moving when throttled
So, the problem is no Reving the bike will start up and idle fine, thus that circuit is good. The Rev/Throttle circuit still crap appears to be giving it TOO much fuel and bogging it down if rev'ed up gas comes out of the air intake in carb. Diaphrams pumping away and all. Have the pilot needles on order from Japan because it's the only logical thing that I can see being bad.
Float hieght is good on both.
Regards.
Arlof