Valve adjustment cb750k 1981

Rampton

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Hi šŸ˜Š to all I own a cb750 k Dohc 1981, I have had this bike for two years and it is really a great ride when it runs. The latest fix was regulator stator and rotor to sort the charging system. Now poor spark number 4 but great on number one also number 3 intermittent. When bike warm #1&2 cylinders plus headers hot but #3&4 cold to touch ordered a new /used set of pick up coils. For peace of mind did compression test highest reading 115 psi and lowest 105 psi so now got more problems old bikes are great but wtf.my question is I have read that know one adjust the valves and this burns the valves, so why don't they adjust the valves is it a major job to do on my own. Would I have to change the valves or just adjust/ change shim's never done these on a Dohc before. Anyone out there got some good advice šŸ˜ƒ thanks
 
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