Shakey225

Great!! But pleeeeeeeeease tell us!

Could the frame be slightly out of line such that when you torque up the engine mounts it is putting flex on the motor somehow, and this is somehow introducing an air leak?? I guess you could try loosening all the engine mounts (but keep them in place obviously), run the bike and see if it is better. If it is then start tightening up the mounts and see what happens? Good luck!

Well well well. Congratulations on getting to the root of the problem! I never would have guessed h/g. Good thinking to spray around the area too. That was quite a ride!

Fingers crossed for you!

That sounds like a potential new line of inquiry - keep going!

Hi Satansam. That's some thorough work you are doing there! Where did you source the new o-rings (I am planning on a carb rebuild on my 750ES)? Cheers

Hi, Does anyone have the wiring diagram relevant to this particular model? Or can anyone confirm that it is exactly the same as the wiring diagram for 1986 (I will post a copy of the one I have below for comparison). I am trying to sort out a very odd starting issue (see my other post). Many thanks

Thanks for your thoughts and the link. It does indeed seem like there is a relay or diode somewhere in the mix causing issues but I'm b***ered if I can find one anywhere. I will try tracing the s/stand light back as you suggest. Thanks again jensvonbustenskjold

Of course...

Bike is a recently imported (from NL) GSX 750 ES from 1988. The Problem: When on the centre stand the bike can be started, put into first gear and the clutch let out - all is well. As soon as the bike is on its wheels with the centre stand up I can start the bike in neutral but as soon as I engage first gear the bike stalls and the side stand warning light comes on. The side stand switch has been removed in the past and the wires cut and sealed. If I remove the wiring from the plug connector, the above situation occurs. If I connect together the two wires that run to the s/stand switch then the same occurs but with the s/stand warning light illuminated continuously. Looking at the wiring diagram (supplied by the previous owner) I can see there is the s/stand warning light switch, a diode in the dashboard wiring between the s/s warning light and the oil pressure warning light, and there is a starter lockout switch between the starter relay and the starter button. I have traced the G/Y wire from the relay, under the tank (which I removed) all the way to the handlebar switch. No lockout switch... Does anyone know where this lockout switch is located? I am assuming there must be a wiring issue that is affected when the rear shock is compressed but need to locate everything in order to check. I have checked all earth mounting points that I can find and have a replacement s/stand switch on order to see if returning to standard solves the issue. Any thoughts welcome.

Is there also a clutch safety switch? I don't remember one (but it is 30 years since I last owned one of these ) and the wiring diagram in the online manual I found (via a thread on here) doesn't show one...

Thanks for the replies everyone. The switch itself is no longer there, just the cut wires behind the clutch cover. I'll double check that. Good shout, I'll check that too.

Thanks TonyGee. I tried that this morning and all went well with the bike up on the centre stand. However when I take it off the main stand and it's on its wheels, the bike cuts out when I put it in gear and the s/stand light comes on ?!? Any thoughts anyone?

Am I right in thinking the two joined wires would then need to be grounded? (I'm doing this on a recently acquires 750ES, haven't had a chance to say hello yet but will do so on a new thread )