Point Adjustment

[Hydroman]

New to the sport (20SS) have an Yamato 80. Would like to put new plugs in, what should the gap be?

[Jack Stotts]

Point and Plug Gap

I use NGK B9ES plugs gapped at .025. You may want to check the breaker points also. They should be gapped at .012. The timing should be at 220 thousandths before Top-Dead-Center. Use a dial indicator to determine the rotation and a timing light or buzz box to determine when the points open. I set the top cylinder first by gapping then do the timing. Tighten the mag plate and check again. They sometimes move when tightened. Then do the bottom cylinder. I adjust the timing on the bottom cyl. by adjusting the point gap. The idea here is to have the cylinders firing exactly opposite one another

[mercguy]

New to the sport (20SS) have an Yamato 80. Would like to put new plugs in, what should the gap be?

first, which head does it have, the 14MM or 18MM????? The info Jack gave is if you have the 14MM head, but I bump my timing up to .235.

[Hydroman]

Point Adjustment

Thanks for the quick replies, I believe I have the 14mm. Will make appropriate adjustments.

[mercguy]

Thanks for the quick replies, I believe I have the 14mm. Will make appropriate adjustments.

14C........who are you?

[mercguy]

Thanks for the quick replies, I believe I have the 14mm. Will make appropriate adjustments.

14C........who are you? If you need any help, and are going to be at the Divisionals this weekend in Oroville.........look me up, if you need any help! We are always glad to have another 20SSH driver in California!

[Hydroman]

I use to run 10C, Frank Banducci's boat. Bought Ken Mallot's old boat. Will be in Oroville early Friday. Slowly getting the engine in line. Will appreciate any help. Having fun, hope to be in a long time.