83gs750e dies at 3500rpm every gear

[rABIDwOLF]

I'm working on my friends bike and wanted to pick your brains. His bike will bog down and die at 3500 rpm in every gear except nuetral. It also works fine of you pull in the clutch. Could he have some problem with his clutch or what?

[chef1366]

Either the igniter is bad or the slides are stuck.
No mechanical advance, right?

[rABIDwOLF]

Sorry I don't exactly know what you mean by mechanical advance. And, in regards to the igniters; I don't quite follow where that would be the issue if I have perfctbignition all the way to redline when the bike isn't in gear.

[Billy Ricks]

Have the carbs been cleaned? Sounds like dirty needle jets, also called emulsion tubes by some folks.

[rABIDwOLF]

Yea the first thing we tried was completly taking the carbs off and cleaning all the jets and such. It didn't seem to help at all.

[Billy Ricks]

Yea the first thing we tried was completly taking the carbs off and cleaning all the jets and such. It didn't seem to help at all.

It could be the ignitor as already mentioned, that's right where the electronic advance kicks in. Just because it will rev to redline in neutral doesn't mean the advance is working.

[rABIDwOLF]

Okay that makes sense. How would one go about testing that theory?

[TheCafeKid]

Either the igniter is bad or the slides are stuck.
No mechanical advance, right?

You're correct Bill, the 83 and up 700 750 1150 had electronic advance.. I think they might have used electronic advance on some of the big G models around then too, i remember my timing plate on my 82 1100G looked really different from the mechanical ones im used to seeing..and Im kind of thinking they're both probably right about the advance.. ALL FOUR slides would have to be sticking to stall the bike out.. possible, but highly unlikely. And ALL FOUR emulsion tubes would have to be clogged. I suppose its possible that his needles are just that far out of "in tune" that it could kill it, but you'd think it would break up really badly on the transition first.. And 3500 RPM is JUST at the pilot needle transition anyway.. It has to be the ignitor..

Wolf.. I dunno if you can test the ignitor in your bike the way the mechanical advance bikes can be, but if so its pretty easy..but Im not sure if it will prove your advance is or isnt working...

[Billy Ricks]

Okay that makes sense. How would one go about testing that theory?

Good old fashioned timing light. Watch for the advance on the right end of the crank.

[rABIDwOLF]

Good old fashioned timing light. Watch for the advance on the right end of the crank.

ok I've done timing on other bikes (honda night hawk) but they looked WAY different.
I cant seem to find any section in the service manual that reference how to do the timing on this bike. Any help?

[Nessism]

Is the airbox on the bike?

[rABIDwOLF]

Is the airbox on the bike?

No.
The bike used to work fine, then towards the end of last it year started doing this out of the blue.

We figured the carbs were just dirty so we pulled them apart and cleaned them and fixed a small issue with the petcock.

Unfortunately none of that made any difference at all.

[rABIDwOLF]

Wolf.. I dunno if you can test the ignitor in your bike the way the mechanical advance bikes can be, but if so its pretty easy..but Im not sure if it will prove your advance is or isnt working...

Yeah my old bike was mechanical and was easy to time and figure out...this...well lets just say its foreign to me

[TheCafeKid]

No.
The bike used to work fine, then towards the end of last it year started doing this out of the blue.

We figured the carbs were just dirty so we pulled them apart and cleaned them and fixed a small issue with the petcock.

Unfortunately none of that made any difference at all.

What issue with the petcock? And what happened to your airbox? You have pods now? Jet kit? Did you replace the petcock? its possible your fix didnt really fix it, and now you're starving the carbs.. that's probably right about where you'd notice it too... Just bouncing other, simpler to fix possibilities out there..

[Billy Ricks]

You should be able to see the advance kick in with a timing light. There's no gradual curve, above 3,500 rpm you'll see the timing jump as you give it gas.