Disc retainer screw meaning the one with the left hand thread?


It should be tight. If the disc valve sticks then this screw is tight then there is something going on with the disk valve....Another thing to be aware of is if the motor has been apart...you need to make sure the crank pin is in the disc valve properly. If its not then you have the clicking noise you are describing. A new guy that pulls the motor apart will not realize that the crank pin fits in a specific part of the disc valve. Many times this gets put back together and its not aligned properly. I tried to run one a few years agao and it was not aligned properly. Would not even start up.

So if you have had it apart you need to make sure things are back properly. Its hard to describe the way it goes together even with words and photos....

But if you take it all apart (carb and backplate) you will see where the crank pin rides in the disc valve. Make sure this is properly aligned.

Troy Newman