82 gs 650l help

[Guest]

I picked up an 82 650l shaft drive a while back and just now getting around to riding it and have encountered a major problem. I replaced the air filter and pkugs (one at a time to keep from messing with fire sequence) and now (after around 500 miles) the bike fires right up and idle a fine. But when riding if the rpms reach 4500-5000 the bike starts breaking up and sputtering horribly and if you try to hold the Rpms it simple dies off....I beg for help I honestly have no clue what's wrong

[ThomasMask87]

As far as mods. The only thing that has been done is the exhaust. Stock pipes were removed and were replaced with aftermarket 4 into 2 pipe

[Steve]

I think there will be another "mod" or two in your future.

If you do it relatively soon, you can get by with re-jetting the carbs.

If you wait (a bit too long), you will have to replace some pistons and/or valves.

.

[ThomasMask87]

The thing that gets me is if the bike isn't under load it will turn 8500-9000 with ease

[Steve]

The thing that gets me is if the bike isn't under load it will turn 8500-9000 with ease

If it's not under load, you are not using the main jets.

No idea what pipes you have or how freely they flow, but going up 2-4 sizes on the main jets might be all you need.

.

[tkent02]

No idea what pipes you have or how freely they flow, but going up 2-4 sizes on the main jets might be all you need.

.

If you do it before anything expensive burns up.

[tkent02]

I beg for help I honestly have no clue what's wrong

My first guess would be that there's 32 years worth of neglected maintenance that hasn't been done.

[rwnielsen]

Forgive me but it sounds as though you're running out of gas, either a plugged filter or petcock. Like a fuel flow issue.

[cowboyup3371]

Which, RWNielsen, is why Steve and Tom are recommending the full suite of maintenance be done starting with the carburetors.

[ThomasMask87]

Will start in the morning at petcock and move my way through to carbs. I'll keep posted thanks everyone

[tom203]

Since it ran for 500 miles (and still starts and idles OK) check air filter element to make sure engine didn't swallow it.

[tkent02]

Will start in the morning at petcock and move my way through to carbs.

Don't stop there. The rest of the bike is just as neglected.

[Old guy]

You're going to. Need main jets.

[1_v8_merc]

Are you running a fuel filter? Is the diameter a lot smaller than the fuel line? If so, it could be choking out the bike. I'm only saying this because it happened to my 650 before.

[ThomasMask87]

thanks

Hey guys just wanted to update. Went up 3 sizes on jets and now she purrs like a kitten and runs like a bat out he11(for a 650l) Lol but wanted to say thanks. We kept 1 more GS outta the graveyard.