Bike stumbles

[TeamRiceRacing]

So been working on the 80GS550 all weekend. Re built the carbs again, but still having issue where it starts, idles great, revs to 4k and that's the end of the bike and it dies. Has 107 jets in it, pod filters, and gutted exhaust that has been cut off more or less.

Any thoughts? Move up jets? Timing issue?

[TheCafeKid]

Yup. Buy a dynojet kit. I'm not sure what stock mains on the 550 are (105 maybe?) but you're obviously lean on the needle and the main. Bigger jets aren't going to help you because the stock needle taper is too fat to work with pods and an open exhaust system. You'd have to make the mains so big that WOT would drown it out and you'd have the same problem up top as you do now. Spend the money buy the kit, install it and be done with it.

[trippivot]

how constant is the fuel supply from the fuel tap?
Where are the float heights and could they be sticking closed?

Go up on fuel until it does something different -or-

do you have a battery points and condenser type of ignition on that machine?

[TeamRiceRacing]

It's all stock ignition. Floats are set at 22, per specs I had. Fuel supply seems fine. I did hook it up to a carb sync tool and they were all even but low into a red area that states "timing off or "something"

New to working on bikes so not for sure what to do next. Think I'll order dyno kit and go from there. Couldn't find a kit on ebay, other suggested places?

[elrico]

Not aware of all that has been done or checked so far. Valve train;checked out out for proper/correct adj. ??

[TeamRiceRacing]

Let's start fresh. What should I check first? Then I'll report back. LOL.