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Oh wow. I’m kinda scared to use the koso tensioner now as I’ve put far too much money and time into my engine to risk it going boom. I think I’ll go takegawa haha. Thanks for the info! Also how is your tensioner guide wheel holding up in the cylinder? Mine never really lasted so I swapped to the yuminashi one hoping I’ll get better results. Also swapping to their tougher flat chain as it’s supposed to be more gentle on rubber tensioner wheels
I've looked at the yuminashi flat chains. Do you know the correct length chain needed for a koso 4v? I saw there are multiple lengths available.
 

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I've looked at the yuminashi flat chains. Do you know the correct length chain needed for a koso 4v? I saw there are multiple lengths available.
I honestly don’t know but it very well could just be an 88 link chain. You can always pull your koso cam chain out and count the links
 
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