Maintenance & Technical > KX500 Original

High Rev Closed Throttle

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petro:
Hi all! I'm new here and just bought a k5 about a month ago. I have run into a couple things I need some clarity on. First off I was out riding this past weekend when all of a sudden I came up on the mother of all washes and needed to come to an abrupt halt! Well pulled in the clutch and slamed on the brakes but the rpm's were pind. I played with the throttle figuring the slide was stuck. Well I soon noticed that the bike was lurching when riding after that. Also when pulling in the clutch after wot the rpm's took a while to wind down. I thought of a couple possible things. 1) Dirt in carb 2) Air leak. Looking at the carb after the ride there is a lot of dust on it as if fuel is leaking and the dust is sticking. Same thing on reed cadge. Any ideas what it may be and what to do. Thanks. Oh by the way bike is a 94 5hundo (of course) with a fmf pipe and silencer, stock engine.

Mike

KXcam22:
Mike,
  That reving is mostl likely caused by a too lean condition.  It can come from an air leak somewhere or from starving for fuel.  As a suggestion heres where I would start:

1. verify carb jetting (with the chart on the site) for your elevation and set the float level.
2. inspect the base gasket, reed gasket and carb clamps.  On my 92 I didn't like how the stock carb clamps worked so I replaced them with std automotive hose clamps.

Being it is fairly new to you it may be worth pulling off the reed valve and replacing the gasket plus it is cheap insurance.  On important gaskets like base and reed I like to use a gasket cement (like pematex motoseal - cheap & good) to coat the gasket to ensure that no air gets in.  Hope this helps. Welome to the site. Cam.

petro:
As far as the base gasket goes are you referring to were the jug and the crank case meet? I'm going to tear down the carb and the reed cadge and check jetting. First I'm going to clean and spray some break cleaner on and around the intake and reed box while the bike is running at operating temp to see if she revs up when hosed with brake cleaner. Do you have any sug about v-force 2 or 3 which is better? Think I might up grade while apart need some more power raced my buddies 450 and we were neck and neck. Dunes for thanksgiving gotta smoke the 4stokes!!!

Motorrad:
Check the gaskets by starting the bike.   Then spraying somthing lie carb cleaner around the base gaskets.  Head gaskets.   IntakE gaskets.    If it dies. Or changes the way it's running.  Check given gasket.   (make sure you check the entire gasket. Not just one side

Hillclimb#42:
They will also rev like the way you describe, when they start running out of fuel. I.e. clogged fuel line, petcock or carb issue. Idle screw turned way in caused mine to have extra run-on after I shut the throttle off, too, but not really a high rev.

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