Hi Guy’s, looking for info on how to check a Dyna ignition system that's fitted to my 1976 KZ900 with 16,500 miles. I don’t know age of Dyna unit, as it was already fitted to bike when I bought it, but it’s got Dyna 000 Electronic Ignition written on it. Problem started when bike was not running on ...

Head removed & found bent valve, but also small depression in combustion chamber wall opposite plug hole, which suggests something has gone into engine in past. Valve seat & valve also heavily carboned up, which also points to previous damage. Funny how bike was running OK prior to me doing ...

Thanks for replies. I can only think that the pistons caught the valve while holding it open to remove shim, which has bent the valve head slightly preventing it from closing. Whatever it is I need to remove head to check prior to running engine again.

I appreciate that the oil density can make a difference & if it was only 2 thou I wouldn't be worried, but the clearance went from 0.03" to 0.20" (0.5mm). I just can't understand why it would change so much, unless something has jammed the valve open. I don't think I have a choice but ...

Hi, I'm new to club so my first post is seeking some help. Checking the valve clearances on my 1976 Z900 I got a range of clearances from 0.00" to 0.05" so I needed to see what shim sizes I had. I used the tool supplied by Zpower to hold down the bucket on No 1 exhaust valve while I remove...