Stutter at WOT

[the schwartz]

I've just put the carbs back on recently and and running the bike around the neighborhood and it's performing admirably. Took it out on the highway for a more extended run today, and while it's fine overall, I tried really hitting the gas more than I typically due to see how it responded. I'm getting a bit of a stuttering effect, almost lurching when exceeding 7K RPM, ballpark or in that neighborhood anyway. I know there's probably no one answer, but what are some initial things to look for or usual suspects. Also, when I park the bike, I can see some liquid on the edge of the gang plate joining the carbs. It's darker than fuel, suspect maybe some oil mixing in with gasoline and getting outside of the carbs somehow.

Also, I suspect I've routed the fuel line from the petcock to the t-junction on the carburetors wrong, don't know how problematic that might be but take a look, it does touch the top of the first carb

0621191445.jpg

[the schwartz]

Brownish liquid0621191443.jpg

[tom203]

Help us out by putting your bike model/year in your signature ..this is the 1982 gs1100e,right??
did you overfill crankcase? Is the camchain tensioner gasket leaking?

[Rob S.]

Intake/exhaust modified? Carbs re-jetted to account for that?

[the schwartz]

The oil was just changed and it's at the full line, possibly a tiny bit above as I'm not 100% sure I'm on true level, but still some are visible through the side Glass. So if it is over full, it would only be by a small amount.

The bike has a 4 into 1 Supertrapp. Still has a stock air box. I don't think there was any rejetting done, but I'm checking with the previous owner to confirm that.

Cam chain tensioner gasket sure looks like it's seeping


Correct it's the 82 GS 1100 E

0621191817.jpg

[the schwartz]

Will start with draining off <200cc oil tomorrow morning, so oil level is solidly in the middle of the sight glass

[Rob S.]

[QUOTE=the schwartz;2549842]

The bike has a 4 into 1 Supertrapp. Still has a stock air box. I don't think there was any rejetting done... [QUOTE]

Some of those 4-into-1's come with instructions to make no other changes to the intake other than to simply remove the air box cover.

[OldVet66]

That's about the RPM range where mine would stutter, turned out I was too rich at the time. There is also a possibility that if the fuel line is too long and not the right type it can kink in the tight space from the tank to the fuel "T" if not routed properly.

[GregT]

I'd be looking at the plug leads and caps. If you've got a suspect cap, under load at wot, it'll break down.

[LAB3]

As to the oil, did you lube the cable before it showed up? Used the motor oil and plastic bag method to lube mine which lead to me discovering oil on the idle speed knob then figuring out where it came from.