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03 1200 only starts with choke all the way out and stays out to keep it idling, can not give it any throttle or it dies, push choke in any at all it dies Only has 1557.0 mils on it, fresh gas in it, vac slide on carb dosent move when trying to throttle it. Please help

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  • Motorcycles Master
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Hey LD,

Bummer. Sounds like one of a couple of things... You did not specify what BRAND your bike is, but with the slide comment, I presume a Mikuni or similar type of carb.

So the artificial enrichment circuit is actuated during choke operation. This circuit only works with the throttle plates in the IDLE position. ANY throttle and that circuit drops out of the picture and the idle/slow/main jet circuits take control.

You COULD have a huge vacuum leak, and that would cause what you describe. Look carefully, squirt bottle some water around the intake/carb/manifold areas. Any change in idle is suspect. But you may not be able to achieve this, based on choke only operation.

SO, my thought is something is plugged in your carb. This happens with old gas and stagnation. Often the enrichment circuit will flow, but not the idle circuit. The only remedy is surgery. Typically you pull the carb(s) so you can inspect well on a bench. Pull the float bowl and look for foreign material of any kind. I have seen moss like growths in there... Perform an overhaul, with the long submersion, followed by flushing and high pressure air..

There is one other, fairly Bonsai method that works: You fire up the bike, with the air cleaner off.... Get as much engine speed as you can... One hand on the throttle, ready to open, and briefly cover the entire carb intake with the palm of your hand, at the same time, you need lots of throttle. What this does is sometimes dislodges a blockage. Really works well on lawnmowers. This takes a time or two for you to get everything synced, but you need lots of throttle and full intake air restriction. Sometimes works, sometimes not. I always worried about being successful as that means there is some chunk of something floating around somewhere in my carb. I would perform surgery.

I hope this helps.

Doc

Posted on Dec 01, 2014

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