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I have a 2006 Kawasaki kx450f. It was hard to start & running badly & found that the fuel filter in the tank & tank were full of gunk (grass,dead flies etc). cleaned all out. then checked the carb to make sure it wasn't all dirty aswell. found the float out of adjustment. Set it to the settings in the workshop manual. Put it all back together & now it will only start with the choke on & the hot start leaver pulled on aswell. It starts quite easily though. If I let go of the hot start lever it just stops. The same goes for the choke. What's going on ? :banana:

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Check the pilot jet, it's the small jet you remove with a small flat blade screw driver. Try blowing through it. They can be hard to clean sometimes because the passage is so small.

The pilot jet basically controls up to 1/4 throttle.

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Thanks for the help. I stripped the carb down again and blew everything out again and it started fine without needing the hot start. There must have been some small piece of dirt in there somewhere. Gave it a test run and it's trying to wheelie in every gear. It's back to scaring the hell out of me again. It's just not ticking over without the choke now but I'm sure I'll sort that out once I get some spare time. Work is such a pain . :-)

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Check the pilot jet, it's the small jet you remove with a small flat blade screw driver. Try blowing through it. They can be hard to clean sometimes because the passage is so small.

The pilot jet basically controls up to 1/4 throttle.

:banana:

Had the exact same problem where the bike only idles when choke is on. Cleaned pilot jet out, and running great now.

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Gave it a test run and it's trying to wheelie in every gear. It's back to scaring the hell out of me again.
That brings back good memories. I remember when my 06 was brand new. The engine was tight and grumpy. The rear D756 was sharp and grippy on the loam and grass. The stock chain would crack louder than the exhaust. I'd give it bursts of open throttle and it was pure "W.T.F!" every time. :banana: I just couldn't comprehend the thing. I thought maybe I should have got the 250F, but 180 hrs later and I love it. It' a very tough and responsive engine. I'd almost call it loyal. :lol:

I got used to it, but also because of the suspension and setup, I'm sure my 06 bike handles 10x better today. I'd love to ride a stock healthy 06 one day. Just to compare handling. Interesting to read old 06 reviews. The 06 won most shootouts back then. Testers even wrote that they thought it handled great! I'm sure I could not ride fast enough to push the harsh forks properly, but how testers agreed with the rear shock beats me. Maybe I just bought a lemon! :banana:

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Problem is still there. Wont run without choke. I've stripped it all down so many times now I could do it blindfold. The manual says float height should be 8mm +/- 1mm. measured with the carb upside down. I've set that. When I check float level with carb rebuilt with a clear plastic tub coming out of carb drain plug it measures 7mm above bottom of carb (not including carb float bowel). The manual says it should be 6.5mm +/- 1mm below the carb bottom. Could this be a typo as no matter how much I adjust the float height it wont come close to that . I spoke to a dealer & he said he would firstly change the float valve. I did this at the cost of £19 (even though the original looked fine, going against my gut feelings). It's still the same & now I have a spare float valve. This is starting to drive me crazy as all I wont to do is ride my bike with my daughter. Oh yes I've even check all jets with a magnifying glass. HELP !!!! :-(

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What about turning up the idle screw? Clockwise turns up the idle as if your looking at it. You can even turn the fuel screw all the way back. Count the turns, then turn it out a little further. Noone mentioned that

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What about turning up the idle screw?
Good point. He wrote nothing about how it runs at various throttle positions - after it is started.

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It runs perfectly at all throttle positions.
So you saying problem solved because you turned up the idle speed screw? Or you ignoring that it does not run when closed/idle?

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It runs perfectly until I turn the choke off, then it dies. As I turn the choke off slowly I've tried opening the throttle and it feels just as if there is no fuel getting through as if it was running out of petrol. I'm going to strip it all down again today & get an air line to it as there MUST be some dirt still in there and there is no damage to any of the component parts. "Once more into the breach my friends"

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It appears that I forget to say that it all fixed now. I spoke to a local off road specialist & he suggested that the throttle slide cover could be on the wrong way.....he was right. The no replacing experience with these things. Will never make that mistake again. We live & learn. Thanks for all your help on here. :-)

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