Maintenance & Technical > KX500 Original

Cold Start

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hughes:
How does ya'lls 500's run when first cold started :?: Mine likes to rev a little high when she first starts. I pull the choke up and kick her one to two times push the choke down and next kick she starts but revs high. I then just pull the choke up half way for a sec. to get the rpm's back down or I just let out on the clutch and let her idle in first gear to warm up. After she's warm she will idle great with no reving even after hard runs. Is it normal for these things to several mins. to warm and clean all the cold start fuel out of the system :?:

mikesmith:
Mine doesnt rev when cold.

gowen:
I believe that means your pilot is lean or you have a air leak.

reknelb:
I just bought my bike a few months ago. I was getting it ready for the big thaw, and noticed the bike didn't return to idle without surging a couple times first. This was with the bike in nuetral, and cold. It got slightly better as it warmed but it would still do it. I took my carb off to check jetting and take a look at my reeds. I thought my bike could be jetted lean and the cold spring weather making it surge/idle high. Turns out I had a 60 pilot, and a 175 main. Thats a bit rich compared to the jetting chart. My reeds were in good shape. Figured I had an intake leak (also noticed some fuel dripping from the mouth of the intake before I took it off) After a close inspection, I found a nice hole in the intake rubber. Didnt find it the first time i looked it over. :shock: I've got a new intake rubber ordered and it should be here mon., I've also got an assortment of main jets and pilots. I've got a 168main and a 58 pilot in the carb now. I'll let you know if the bike runs a little better with the new boot.

hughes:
I will be needing a new intake boot myself. Mine is cracking on the out side but still looks good on the inside but that doesn't mean it alright. I will order new boot and play with the pilot. I would hope an air leak in the seals would make it rev. all the time and not just when cold.

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