Sucking....

[rgvsp]

and not the fun kind.

My 76 is sucking some unwanted air from somewhere after my winter transformation into an SP. Over the winter an SP cam went in, SP carb inlets on and the SP carbs went on. All new o rings went into the carbs, including choke. Carbs were completely broken down and cleaned.

She is holding at about 4000 rpm and the plugs are getting a white tone to them. The warmer the engine gets the worse the problem seems to get.

I've been spraying WD40 all over to try and find the leak and can't get a response. I've sprayed the head gasket, inlets, all over carbs with no rise in revs.

Any ideas on what I might have goofed up? Maybe somehow messed up o rings in pilot aircrew?

[tigerclaw]

Excuse the obvious comment but sometimes we overlook the obvious. Idle speed screw. Cables to tight or choke setup wrong?

[dobbslc]

O rings on the carb tops next to the diaphragm?

[rgvsp]

Tigerclaw,
No worries, I'm open to all ideas at this point. I've checked the throttle cable and idle screw.

Dobbs,
Those are brand new but if I can't figure this out soon I'm just going to replace all orings again.

[rgvsp]

I haven't gotten to test it out yet but I think my issue was the seals around the the throttle shaft going through the carbs. By the way, if you have an SP and order them, you need 7. Litek gives you six and even the SP manual lists 6.

[willandrip]

Tell Blair that; he will make a note of it, so as not to inconvenience others.

[rgvsp]

Unfortunately I'm still having issues. I've replaced the throttle shaft seals and when I fired her up the problem actually seemed worse. I sprayed starter fluid between the carbs and it reved to high hell. Is there a trick I'm missing when putting the bank of carbs back together?

[glimmer]

did you find a solution?
i'm guessing you've read Tony sleeps article "the great carb saga"
http://tonysleep.co.uk/info/great-gsxr4 ... ettor-saga

[rgvsp]

Oh yeah, I read that before I even bought the bike. Sadly I haven't solved my problem. Every time I think I've found something I put them back on and same issue. It is sucking unwanted air in from somewhere. I'm still plugging away trying to find it. My main problem is lack of time to work on it!