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Valve Adjustment Method, Vote for Yours!

How do you adjust your valves?


  • Total voters
    5
For newbies like me reading this you don't need to put a straw down the hole and don't put a pencil down the hole, That piston will grab that straw or pencil against the cyclinder wall and chew the tip off, then you have a straw tip or worse a pencil tip in your motor. Though a pencil can be consumed maybe a straw can't ? Been there done that. I went to MotoXotica mechanic to teach me how to find close to TDC for valve adjusting. Yes take out the sprk plug, Put the bike in neutral use a rag to protect your hand and then use your hand to move the kick starter to rotate the piston and valves. the TRICK is getting the piston and valves to stay in place JUST prior to SWOOSHING around again. WHen you get it right then one set of valve tappets will be up and loose to touch ready for adjust ment. Loose to touch means you can grab them with your fingertips and lift them and feel the clearance ever so slight. Roll it again for the other set to poke their heads up and hold steady then adjust those.

This is a fast efficient way. I can do my valves (the actual find it, feel it, adjust it by 1/6 turn method part all in like 20 minutes.
 
What I want to know is why you can use the 1/6th method if the screws have a 1mm thread ?
Or have I got the pitch wrong ? There seems to be alot of difference between 1/6th & 1/8th method in actual size ( 0.041) why are both methods ok to use if so important they are correct ? I use the 1/8th turn method & have no problems but am now confused by the 1/6th turn business. Just thought I'd ask for all the newb's. :lol:
 
I think the tappet screws have a thread pitch of 0.7mm which is 0.027".

1/6 of 1 turn = 0.12mm or 0.0045" (four and a half thousandths).

1/8 of 1 turn = 0.09mm or 0.0035" (three and a half thousandths).

I think some folk use 1/8 turn if they want to tighten up the clearances and perhaps compensate for the locknut pulling the screw up when you tighten the nut.

I fact the recomended clearance is 0.1mm which as you can see is in between 1/6 and 1/8.

The difference of 0.001" or 0.025mm is very small and perhaps debatable whether it's worth worrying about
 

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