Honda-SOHC

The washers stick in the head recesses but if really missing are still available new.
On the adjuster is the thread stripped all the way down or just at the end? Honda should never have put that slot in there it gets abused.
New pattern ones are available but expensive and dont often come up used in good order any more.
I MAY have a used one but it wont be cheap

The early K's had some problems but they were inline 3 or 4 cylinder bikes, i was taught by a good bm mechanic how to stop tappet rattle and will pass that on if you wish

Trouble with the Haynes Ash it tries to cover the 350,400,500 and 550 the smaller ones are different enough to make that cnfusing rading.
I was told that Haynes had bought Clymer but not sure how true that is, their museum is worth a visit

Bike or manual? The parts book on there is Japanese.
I supplied them all to Ash by the way.

I can still burn the all to a dvd for a small fee if wanted

Alladins cave on here but you need the 500 manual plus the supplementsup to your model

Delta, i disagree,
On the asvise of an ngk rep who was a well respected sidcar racer i used D7EV in my 500 that went all over the UK and to the Isle of Man regularly plus commuting 7 miles to work.
Never fouled, never failed yes nearly twice the price but well worth it  the =L was always sold as a "half grade"

I think its 3/16 whitworth socket that will hammer onto that and undo it, never failed me when working for a Honda dealer, might be 1/4, its a long time since i did this

If its realy that much of an angle use one from a bmw airhead where the master is under the tank and operated by cable from the lever