2000 AC 90 idles but dies with throttle

[whitdog54]

its a 2000 AC 90

it runs, but when ever I hit the throttle it just dies. The compression is good, i drained the carb....still nothing. Runs perfect, then any throttle will kill it. Any help will be well appreciated, thanks in advance!

[Sc0tt]

I have one doing the same thing. I still think it may be carb related.

[Ajmboy]

Has it been sitting a while? Maybe the float is getting stuck. Take the carb apart to see what's going on, maybe it's starviing on fuel.

[whitdog54]

I was stuck in snow and had it pinned, then all of a sudden it slowly crapped out. Its getting fuel

[Stoopidbot1]

Jets could be clogged, how's the air filter? Did you get a bunch of snow in your airbox, have it melt and suck water?

[whitdog54]

Jets could be clogged, how's the air filter? Did you get a bunch of snow in your airbox, have it melt and suck water?

maybe, but wouldnt that cause hydro lock and it wouldnt run at all?

ill take apart the carb sometime next week

[Stoopidbot1]

Yeah, you're right. I was just throwing some ideas out.

I changed your thread title for google search purposes.

[whitdog54]

you think compression could have anything to do with it, or maybe a seal or piston ring? It was at WOT for like 2 minutes straight lol...i kinda beat the hell out of it.

[DirtDemon]

Compression could be an issue for sure, do a test. Also check the timing. If you have a service manual, it should tell you how to check the ignition components with a digital multimeter. If every thing looks ok with those, check valve clearances and the timing chain.

[Sc0tt]

Is an AC 90 a 2 or 4 stroke?

[whitdog54]

4 stroke

[Ajmboy]

I would rip the carb out like you said you were going to do, and a compression test like DirtDemon said. I'm leaning towards a carb issue. By a rebuild kit from the dealer.

[whitdog54]

update

Its been sitting for about 3 weeks....never touched. Started and drove fine? I have no Idea what was up, but it works now so w/e haha. Thanks for the help guys....Ill probably need to strip down that carb sometime.

[Sc0tt]

Yep sounds like it maybe a little water in the gas.

[whitdog54]

Really? Should I do anything before running it again?

Wonder how that happened? I had the thing buried in the snow, but im not sure how it could have gotten in to the carb or gas tank.

[Sc0tt]

No if it is running fine now I wouldn't worry about it.

[DirtDemon]

You also could have gotten a little water behind the stator cover. If you have the same problem again in the future, check the secondary ignition system. Ignition components work fine one minute and can go completely dead the next.

[Ajmboy]

Glad to hear you got it running. Maybe you are getting some moisture. As long as it's running now!!!