SOURCE: changing engile oil 2007 yfz 450
the service manual is on this link .
http://www.scribd.com/doc/2634179/yzf-r1-manual
SOURCE: Yamaha YFZ 450 engine serial number
im unsure but arent they on the sterering stem on a metal stamp or perhaps under the gear shifter I am unsure
SOURCE: 04 yfz 450 wont start with electrical start
i have a 04 yfz 450 quad. the compression ratio like yours is extremely high. ive had my battery go bad and found that another battery other than factory would turn over the engine, but would not start. i paid the 100 dollars for the factory battery and it fired right up. because of the high compression you need a high cranking battery.
SOURCE: carburetor adjustments yamaha 450yfz 2004
Turn both the air screw and throttle screw inward until they LIGHTLY seat. Now back each one outward one and one half turns. This is the factory setting. I am going to give you a web site where you can download a free PDF factory service manual for a YZ450FR. I believe the model is a bit different but the carbs are the same.
Go to this site and you can download a free PDF service manual. The site may take up to 25 seconds to fully load the list of manuals. It is worth the wait. www.carlsalter.com/motorcycle-manuals.asp The service procedures are there in detail and a lot of diagrams and photos. Don't mess with the pilot screw unless you have to, Part #11 in the diagram.
Can I get a Very Helpful" rating out of this?
SOURCE: how do i remove and clean the carburetor on a 2005
The easiest way is to remove the seat and then remove the entire rear sub-frame - the airbox is attached to the subframe, so it will go with the subframe. Loosen the rear clamp on the intake boot. The sub-frame is only held on by three bolts so it's a piece of cake to remove.
Once the subframe is off, the carb will be wide open and easy to remove from there.
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