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Are the tappets manually or hydraulically adjusted ?
The 'valve clearance' is set by various sized 'tappet blocks'. Measure the clearance, compare what it should be,(Clearance, when the engine cold: Intake : 0.125 - 0.25 mm (0.0049 - 0.0098 in) Exhaust : 0.325 - 0.45 mm (0.0128 - 0.0177 in).) and select a suitably sized one.!! ;)
 

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...hmmm: tappet blocks sound a bit like the 'bucket & shim' setup on some older Japanese motorcycles...

...nice to know - even tho' I doubt I'll ever go anywhere near them!

Joe
 

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...hmmm: tappet blocks sound a bit like the 'bucket & shim' setup on some older Japanese motorcycles...

...nice to know - even tho' I doubt I'll ever go anywhere near them!

Joe
I called them 'blocks' but in fact there are 25 different height size 'inverted buckets' no shims involved. !! ;)
 

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...the bucket & shim setup always seemed dubious to me: another way for the manufacturer/dealer to get more money out of riders at regular intervals...

...although most of my bikes had spanner adjustable tappets: and my Royal Enfield Bullet has spanner adjustable pushrods with zero clearance!...

Joe
 
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