yfz 450 2004 broken off needle / fuel mixture
#1
yfz 450 2004 broken off needle / fuel mixture
Just bought a 04 yfz 450. Noticed the header glowed at idle after about 1 minute. I wanted to clean up and familerize myself with the carb, so i started going through it and noticed the needle tip to the thumb screw thats located on the bottom of the bowl was broken off and stuck in the carb. I beleive it is the air bleed for the idle mixture. I tried pushing it out by pushing a small tack down through the top but im not sure how small the top of the needle seat is. I dont want to enlarge the top of the seat. Any ideas????
#2
i believe the factory carb. is a kehein fcr. they are mechanic friendly. the thumb screw you are describing should be the idle screw, if it is located on the actual bottom of the float bowl it is either the bowl drain or the accelerator pump. i would take the carb. apart if you are comfortable and do you have a repair manual or can you take the carb. to your mechanic. either way dont be intimidated it should be an easy repair and carb. parts are abundant.
#3
#4
I have already looked at the replacement needle. Here is a pic. Fuel Mixture Screw Keihin FCR Carbs CRF YFZ 450R 450:eBay Motors (item 140344756622 end time Jan-06-10 06:03:33 PST)
It is the very tip. It is only about .030 at the widest point of the needle and about .125 long.
It is the very tip. It is only about .030 at the widest point of the needle and about .125 long.
#5
ok i see the image of the mixture srew, could you use a welder tip cleaning tool, paper clip diameter, or if it is bottomed out in the bore can you use compressed air through the mixture passages, i used to run into same problem in certain auto trans valve bodies. if it is steel use a magnet and paper clip or use grease on the end of a paper clip or similar. i share your pain it can be frustrating.
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