StrayCats GSXR 750 Problem - Only VRF Forum Guys seem to be helpful

So......Hows the Gixxer coming along Stray>

 

<Norcalboy>

 

I hope the sideshow did not scare him off LOL!

 

The last update he was still trying to track down the issue. Believe he was waiting on coils. Hopefully, he will post soon and say he's sorted it out.

 

I have all the parts now and my crimping pliers for making the new HT wires arrived. Now I just need time to get to it, been tied up with visitors for a few days. maybe tomorrow.

Im also waiting on a reply from Dynatek re wiring in the coils. one of the primary wire prongs has a red dot and im wondering if that means the wire from the switch gear or the wore from the ignitor....or maybe it doesnt matter.

UPDATE: Got my answer from Dynatek so im all set to go tomorrow

 

Fingers crossed this is the end of the issue.

 

yea, I have everything crossed.

 

FUUUUCCCCKKKKK MEEEEE

Well, im back to Fuelling as my main idea on this issue.

With the new coils, #3 was still not running properly. After a few minutes of running it was apparent that it didnt want to run Off choke very well, by then 2 cyl were already out of commission.

One by one it started dropping cylinders, popping and snapping more and more until it blew the stopper out that I put in the vacume line the usually goes to the petcock (running off an external tank). Then I notice fuel all over the floor of the shop. ....I shut it down & cleaned up.

Tried to re fire it, no go, held the throttle open and she fired but continued to misbehave and drip fuel from the carbs

Shut her down & pulled the plugs

1 & 2 were fuel soaked 3& 4 very black and sooty (from running on choke im supposing)

1 fue line feeds 1&2 the other fuel line feeds 3&4

I dont know, time to pull the carbs for the 4th time I guess - New K&L fuel needles & seats shit the bed after 1 week ?

im lost

 

I really don't think it's fueling at this point man. Shit is not THAT far off to give you the problems you're having, and then to have the SAME problems after changing so much. Nah.

Fuckity fuck fuck

 

hmmmm, its so strange that it will be fine if I leave if for 3 weeks, then gradually goes to shit. If I leave it now till end of feb, it will fire and run like a champ (for 5 minutes)

I dont know what else gets better over time , other than way over fuelled & flooding

I still haven't pulled the valve cover off, but I cant imagine that would be the issue when its fine one day cold and not the next etc.

The fact that its pissing fuel everywhere now is odd. Must be something I did with the carbs last time. tho it didnt leak the 1st time I ran it after the rebuild.

 

A flooded engine shouldn't need weeks. And it's not like you just found some unmarked jets in a jar and said, "lets give em a shot". Or you said, "these carbs are probably clean enough, lets give em a shot". It can't be THAT FAR OFF.

What were the compression test results again?

I think it is time to pull the valve cover and at least check valve lash.

I think you can pretty safely move on the next culprits at this point.

 

Compression was 160-170 across the board.

but fuel pissing out the carbs still seems odd to me, im not sure Valve lash issues can do that ??? -- lash still needs to be looked at for sure.

its also odd that some times I can change all 4 plugs for new ones and it roars back to life on all 4 cyl -- for a wee while

Ill pull the carbs and the valve cover. just need to muster the enthusiasm, im getting frustrated with it.

 

I'm wondering about the pressurized vacuum line and the popping and backfiring. Backfiring is usually, but not always, associated with an electrical issue. Reversion through the vacuum line is worrisome.

 

I thought that was odd when I read that too.

 

Maybe one of the cams jumped a tooth? Not enough to affect compression, but make the motor a little unhappy?

I'm grasping, I know. But that valve cover has to come off just to say you know 100% everything is cool in there.

 

I'll tell you what... that motherfucker would get pushed over to the side with a sheet over it for a few days to let it think about what it's done if it were mine tho.

 

Yea, I hear ya.

 

I assume its a backfire thru the carbs (#3 has the vacuume line on the manifold) I presume that backfire can also be fuel related , ie popping thru the carb when accelerating is a lean condition usually is it not ?

so many contradictory symptoms.

Once its sat for a while, and I can stand to look at it again, ill get back after it.

In checking my notes, It seems I only checked cyl 2 and 3 for compression, since my plug adapters dont fit. I used the straight solid push in shaft to test but it doesnt fit under the frame for 1 and 4. so....I have anew one on the way.