Maintenance & Technical > KX450F / KX250F

FCR Carb Dirt

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KXcam22:
I was changing my needle setting and was shocked to see that the under side of the top cover on my FCR carb was poluted with dirt after 20hrs from new.  Is this normal?  I can't tell where it came from and the cover oring was clean.  Any ideas. Cam.

don46:
I've had the carb off my 07 and never noticed and foreign debris in the slide area. thinking about it there are only a couple of entry points to get to the top of the slide, either the cap gasket or the shaft coming from the throttle cam. neither seems likely, oh yeah I forgot the throttle position sensor.

kaw rider:
throttle cable :-D

hughes:
http://7602racing.com/catalog_Yamaha.php

It's time for these

http://www.brpmoto.com/product_info.php?cPath=45_287_699&products_id=1914

maddoggy:
at first i was thinking that there was no way that dirty air would be flowing through the vent tubes. i was thinking that the intake air would be following the path of least resistance theory which would mean that 100% of intake air would flow through the airbox. then i got to thinking about a time my atv wouldn't run right at higher rpm's. i found that some of the vent tubes were plugged up on the carb. after i replaced the vent tubes the issue went away. i've assumed that the issue was that the carb wasn't venting properly,  but now i am wondering if it was not allowing the suction that the carb was wanting. i have my doubts but one never knows. those filters that hughes suggested may be a good idea. they certainly can't hurt.

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