Question about 2000 Yamaha WR 400 F

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Yamaha wr 400 2000 model pulled apart carby to clean

Yamaha wr 400 2000 model pulled apart carby to clean it then a little spring came out not sure where it goes
bike wont start and when it does it runs it runs very ruff and not idle

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Big spring is for the dighram! the only other wouls be for the pointy mixture screw
Cheers Rob
wind the screw in till it just stops [not hard]
then wind out about 1 & 3/4 turns that should be a close air fuel mix then adjust idle & mix till you get it right
Cheers Rob

Posted on Jul 29, 2009

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My wr400f runs sound when idling but when i take for a spin it will go for a while then suddenly it will cut out and when it cuts out it takes a while to start again. I tried engine flush in it and gave it a service but that still did not work. reckon its something to do with the carb? Thanks

Posted on Jan 15, 2010

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Yamaha royal star motorcycle cluch whine and shudder in 4th and 5th gear at any speed

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You will find the main jet in the carby is the problem, i had a similar problem with a yz426, cleaned the carby out several times but the actual jet somehow was damaged and ran fine once replaced

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A quick solution is to tap on the carby float bowl, with something like a screwdriver handle. sounds like the needle and seat is stuck, sometimes a few taps on it can fix it. Your carby float is stuck down.
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G'day, sounds a bit like the float valve in the carby might be stuck nearly shut or just some moisture in the carby, a light tap with the handle of a screwdriver on the side of the carby bowl should fix it if it's the needle stuck shut (happens from sitting sometimes), or maybe try loosening the drain screw in the bottom of the carby bowl to drain any water etc out, hope this helps :)

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The choke allows more fuel into the engine, I would say that you have dirt or bad gas stuck somewhere in your carb, so give it a good and thorough cleaning, including the pump. Also make sure your air filter is clean!

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Just a thought, At first I would suspect low cicuit on carb being plugged or mixture passage. But after reading your cleaning carb I would be inclined to say check your timing as long as you are sure your carb is cleaned well and adjusted.

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