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Tappet adjuster tool dominator 99 1961

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Hi does anyone happen to know what size tool is required to adjust the tappet? Is it 5/16
​​​​​​ Thx 

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0.44 " ( 11.3 ) mm                                                                               

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That's 3/16" BSW or 1/4" BSF 

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... for a Triumph twin which uses a similar method. A short length of 1/2" diameter alloy rod drilled centrally (about 6mm IIRC) then a tapered square section drift hammered into it. Then knurled to make it look posh.

Actually just realised it was for a Honda but the same applies.

Here it is:

tappet tool

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Assume it simply needs something to hold it still while the nut locks it up right? 

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Didn't the rear shocks adjuster spanner had a square hole?

 



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