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Dirt Bike Brands - Other
Carb Issues
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[QUOTE="Grashopr, post: 375479, member: 28542"] I have NO idea what my altitude is...I'm in Kansas...it can't be very high...maybe 400-500 ft max. My compression is solid...I've developed a bad case of foot bruising from kicking the thing over (with alpinestars on even). It WILL NOT move at all without the Comp Rel lever after you bring it up on compression. Thank you all for your info...but....I think I found out what the problem was though. When I took my carbeurator apart, I took the float bowl off, then removed the float from the lower section of the carb that I call the metering block (it has the fuel metering 'circuits' in it..one for pilot circuit and one for main circuit). Then I removed the 'metering block' from the bottom of the carb's main housing. There were four VERY small allen-head bolts that held this peice on, and Yamaha or Keihin had filled the heads of these with some sort of hard-pack epoxy that was apparently supposed to keep you from being able to get an allen wrench in there to take the peice off. Well, I took a pick and cleaned out the allen head bolts and removed the metering block from the main body...this block has the 'venturi assembly'...the peice that determines the size of the carb (38mm, 34mm...etc) and the same peice that the needle sits in and slides up and down through. When I removed this...there was a gasket that is very small and very intricate that seperates all of the passages for the pilot 'circuit' and the main 'circuit'. When I put the thing back to gether, this gasket had moved and fuel was getting from one hole in the main circuit area into the pilot circuit area...that explained the hard starting...EXTREMELY RICH! WORD TO THE WISE: DON'T TAKE THAT PART OF THE CARB APART!!!! If you check the carb break-apart diagram in your manual against the actual carb...it does not show that the carb comes apart there...it doesn't even show the bolts that I took out. If you go to Yamaha and ask them..their schematics don't show this part of the carb either..and they CANNOT sell you those gaskets...Sudco, Int (the distributor of Keihin parts to your local Yammy dealership) has gaskets for the carb, but as of today, they still aren't sure if they will fit, as the carb on our bike is not the same as the regular (HRC??) Keihin carb...our float is different and our throttle-rotator assembly is different. They are shipping the only gaskets that they have..but they had me call Yamaha...and Yamm USA said that there is NOONE in the USA that can tell me whether those gaskets work for sure or not...but if I could speak Japanese, they would patch me through to Japan when they opened up (sometime around 4am our time??) so I could ask them whether the gaskets were the same....so...if you decide to clean your carb...STOP AT THE FLOAT! Thanks again for your help guys. Grasshopper [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Carb Issues
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