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Valve seats and Valves

Posted by Andy C <iframe src='https://members5.boardhost.com/classicbikemart/info/user=Andy+C' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 11:13 am

I said further down in another post how good the Morini valve seats look, and they do, in the head and on the inlet valves.

Taking a closer look at the exhaust valves, they are shot, both have a tiny crack from the edge of the valve accross the seating face, so I am amazed that the seats in the heads are so good.

Clearly the cracks would not have been good for compression or performance.

Valve clearances were correctly set by the way, perhaps I need to use Valvemaster or similar after the rebuild.

The hunt is now on for 2 new Ex valves.

Who needs a signature anyway......

Re: Valve seats and Valves

Posted by laverdabru <iframe src='https://members5.boardhost.com/classicbikemart/info/user=laverdabru' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 11:32 am, in reply to "Valve seats and Valves"

Good job you spotted them - could have been nasty & expensive if it had happened when you were out & about.

Re: Valve seats and Valves

Posted by Andy C <iframe src='https://members5.boardhost.com/classicbikemart/info/user=Andy+C' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 12:09 pm, in reply to "Re: Valve seats and Valves"

Tru, a chunk of valve falling off would not have been good

Who needs a signature anyway......

Re: Valve seats and Valves

Posted by Triton Thrasher <iframe src='https://members5.boardhost.com/classicbikemart/info/user=Triton+Thrasher' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 11:41 am, in reply to "Valve seats and Valves"

You don’t need fuel additives.

Re: Valve seats and Valves

Posted by Andy C <iframe src='https://members5.boardhost.com/classicbikemart/info/user=Andy+C' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 12:08 pm, in reply to "Re: Valve seats and Valves"

So I would be wasting money on something like Valvemaster?

Who needs a signature anyway......

Re: Valve seats and Valves

Posted by geoff the bonnie <iframe src='https://members5.boardhost.com/classicbikemart/info/user=geoff+the+bonnie' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 3:40 pm, in reply to "Re: Valve seats and Valves"

The valvemaster would not prevent the valve cracking. I only ever had a valve crack open on a 1965 Mini Cooper and they were expensive sodium filled valves .Not had any bike valve fail apart from wear on the valve tip.
Of course, JB weld will fix most things Andy

Re: Valve seats and Valves

Posted by Andy C <iframe src='https://members5.boardhost.com/classicbikemart/info/user=Andy+C' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 6:14 pm, in reply to "Re: Valve seats and Valves"

Of course I will dig out the hight temp JB weld I have in the shed

now why didn't I think of that.

Who needs a signature anyway......

Re: Valve seats and Valves

Posted by geoff the bonnie <iframe src='https://members5.boardhost.com/classicbikemart/info/user=geoff+the+bonnie' width='330' height='300' border=0 style='border:none;'> on October 5, 2025, 9:14 pm, in reply to "Re: Valve seats and Valves"

Spray some silver Sperex paint on and jobs a good un

Re: Valve seats and Valves

Posted by Leon Novello <iframe src='https://members5.boardhost.com/classicbikemart/info/user=Leon+Novello' width='330' height='300' border=0 style='border:none;'> on October 6, 2025, 7:24 am, in reply to "Re: Valve seats and Valves"

Attach a rubber cap to the valve stem for quieter operation. On Royal Enfields, loss of performance will not be noticeable.

Leon Novello

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