Exhaust Pop and Other Issue

[matts12290]

This is with a 2002 GS500. So about 4 months ago my bike was not starting at all so I went in and cleaned the carbs. After that, the bike started up fine, but when I am holding steady in 2nd gear or higher, it won't hold the speed (it sounds like it decelerates and then accelerates again kind of making it really jerky). And then on top of that, the exhaust will sometimes pop. I am not very engine savvy so I was wondering if someone could help point me in the right direction. Another thing, not sure if it is related, is that when putting everything back together I think the throttle cable is a little tight so it is more sensitive when accelerating.

Let me know if you have any ideas and thanks in advance!

[Bluesmudge]

Do you have an aftermarket air filter or exhaust?

[matts12290]

Nope, everything is stock.

[matts12290]

Any other ideas?

[89500inPA]

I would start by looking for an air leak. There are several ways to do this, use the search function to find one that is easy for you do do.

[sledge]

Air leak or clogged pilot circuit.

[Funderb]

I would recommend cleaning the carbs again, more thoroughly. Use a tiny copper wire to clean the pilot jets, use spray carb cleaner and also soak the jets, use compressed air (60-100psi) to blow out any passageways in the carbs. soak them in pin sol solution overnight if you want. (dont soak rubber parts) While the carbs are off check for penetrating cracks in the intake boots, and check all vacuum lines and replace any suspicious ones.
If you live in a non-emissions enforcing state I'd delete the PAIR system.

Good intake boot test: With the carbs off, and your hand over the intake boot, bump the starter button until your hand gets sucked in. Get a good vacuum built up in there. Now wait... Does the suction leak away? if yes, you have three options.
1. IN Valves are dirty or very far out of adjustment (intake valves usually stay clean and don't stretch much, so probably not)
2. carb boots are cracked through and leaking
3. your hand is too small to plug the intake up properly.