16-11-15, 01:37 AM
Not possible to get and only as sadlonelygit says if you grind them down.
Have you checked all the shim sizes as you might be able to swap some around to get the clearances close to what you need.
The size etched on the shim is not always 100% accurate and you would be well advised to check them with a micrometer.
I will check my stash tomorrow and see what I have close to 1.89.
Note:-
The specs for the exhaust valves is 0.21 to 0.30 not 0.21 to 0.25 as stated in the Yamaha service manual and the Haynes manual.
Have you checked all the shim sizes as you might be able to swap some around to get the clearances close to what you need.
The size etched on the shim is not always 100% accurate and you would be well advised to check them with a micrometer.
I will check my stash tomorrow and see what I have close to 1.89.
Note:-
The specs for the exhaust valves is 0.21 to 0.30 not 0.21 to 0.25 as stated in the Yamaha service manual and the Haynes manual.