Posted January 30, 2003 - 05:48 PM
When I took my flywheel off to replace my woodruff key the fit between the flywheel and crank did not feel as tight as on other bikes I have owned.I pressed the rotor onto the crank by hand without the key in place and was able to spin the flywheel freely.All the other bikes I have worked on when doing the same thing have all had some type of friction.
To me it seems as if the taper might be off slightly.It seems a little tight on the out side or small dia. of the rotor hole.I will bring home some spotting dye friday and see how they match under different torque specs.If they are off slightly it can usually be fixed pretty easily by lapping the two surfaces together with valve grinding compound.
Posted January 31, 2003 - 02:58 AM
"Certain types of small tools and machine parts, such as twist drills, end mills, arbors, lathe centers, etc.,
are provided with taper shanks which fit into spindles or sockets of corresponding taper,
thus providing not only accurate alignment between the tool or other part and its supporting member,
but also more or less FRICTIONAL RESISTANCE for DRIVING
There are several standards for "self-holding" tapers, but the American National, Morse, and the Brown & Sharpe
are the standards most widely used by American manufacturers.
The name self-holding has been applied to the smaller tapers¾like the Morse and the Brown & Sharpe¾because,
where the angle of the taper is only 2 or 3 degrees, the shank of a tool is so firmly seated in its socket that
there is considerable frictional resistance to any force tending to turn or rotate the tool relative to the socket."
On mine their is no frictional fit .It is as if the flywheel hits up against a stop.You should be able to feel
resistance between the flywheel and crank even with hand pressure before you put the fly wheel nut on.
Posted January 31, 2003 - 03:42 AM
Please let us know what you find out in your research for the truth.
Posted January 31, 2003 - 09:57 AM
Just wondering, because I don't know if a dealer would take that much time to check something like that when they fixed it for you.
Posted January 31, 2003 - 10:27 AM
P.S. Just the fact that Yamaha has placed not less than three different successive torque values (for the rotor bolt) in the manual tells you they know there is a problem and they've been fishing for a cure. Bad business indeed.
If I had one of these bikes I would immediately check the rotor by pulling it to check the fit.
Posted January 31, 2003 - 01:48 PM
Posted February 02, 2003 - 04:21 PM
p.s.thanks Utvols,jetting workingout great so far ,just waitting for starter jet
Posted February 03, 2003 - 04:40 AM
I had read somewhere in TT that the flywheel puller is different on the 03 WR450 than the 426's. Is this true, do I need to order a new puller?
Posted February 03, 2003 - 05:00 AM