valve grinding


Information and questions on GL1000 Goldwings (1975-1979)
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ntintruder
Posts: 66
Joined: Tue Jun 28, 2011 9:07 pm
Location: Willoughby,OH
Motorcycle: 1976 GL1000
1972 CB750K2
1977 CB750f

valve grinding

Post by ntintruder »



Does anyone know if you can grind the valve faces on a 1976 Goldwing ? I am going to clean up some cylinder heads and I have been told to have the seats ground but the valves should be replaced, I have also been told the valves can be ground, so which is it?


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Maz
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1979 CB750L
1990 Yamaha FJ1200
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Re: valve grinding

Post by Maz »

ntintruder wrote:Does anyone know if you can grind the valve faces on a 1976 Goldwing ? I am going to clean up some cylinder heads and I have been told to have the seats ground but the valves should be replaced, I have also been told the valves can be ground, so which is it?
Both. You grind the valves into their respective seats. If the valves are damaged beyond grinding, they should be renewed, but you will still have to grind the new valves into the seats.
If there is major damage to the seats, they can be re-cut, but, again, valves will need to be ground into the re-cut seats.

Maz
Ironically, Common Sense is the LEAST common of all senses!
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dingdong
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Re: valve grinding

Post by dingdong »

Don't grind the valves. You can cut/grind the seats. But these valves have a thin stellite coating on them. Grinding will remove it and they will burn. Lap them into the seats but don't grind them.
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Maz
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1979 CB750L
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Re: valve grinding

Post by Maz »

dingdong wrote:Don't grind the valves. You can cut/grind the seats. But these valves have a thin stellite coating on them. Grinding will remove it and they will burn. Lap them into the seats but don't grind them.
Dingdong, I think the terms 'grinding' and 'lapping' get confused between the US and the UK. :oops: I was, indeed , referring to 'lapping' the valves with paste. Apologies to ntintruder, too, for any misunderstanding.

Maz
Ironically, Common Sense is the LEAST common of all senses!
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dingdong
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Re: valve grinding

Post by dingdong »

Maz wrote:
dingdong wrote:Don't grind the valves. You can cut/grind the seats. But these valves have a thin stellite coating on them. Grinding will remove it and they will burn. Lap them into the seats but don't grind them.
Dingdong, I think the terms 'grinding' and 'lapping' get confused between the US and the UK. :oops: I was, indeed , referring to 'lapping' the valves with paste. Apologies to ntintruder, too, for any misunderstanding.

Maz
Yeah, you guys need to learn to speak proper English. :lol: ;) :roll:
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Maz
Posts: 785
Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: valve grinding

Post by Maz »

dingdong wrote:
Maz wrote:
dingdong wrote:Don't grind the valves. You can cut/grind the seats. But these valves have a thin stellite coating on them. Grinding will remove it and they will burn. Lap them into the seats but don't grind them.
Dingdong, I think the terms 'grinding' and 'lapping' get confused between the US and the UK. :oops: I was, indeed , referring to 'lapping' the valves with paste. Apologies to ntintruder, too, for any misunderstanding.

Maz
Yeah, you guys need to learn to speak proper English. :lol: ;) :roll:
I guess I need to watch some more US program(mes) on TV......not that you could get any more over here! :D
Maz
Ironically, Common Sense is the LEAST common of all senses!
ntintruder
Posts: 66
Joined: Tue Jun 28, 2011 9:07 pm
Location: Willoughby,OH
Motorcycle: 1976 GL1000
1972 CB750K2
1977 CB750f

Re: valve grinding

Post by ntintruder »

Yeah I know about lapping the valve to the seat after the seat has been ground and I was pretty sure that you can't grind the valves. I've done Honda 750 heads and we always replaced the valves with new, so I thought that that would be the case with the Goldwing. Anyway, thanks for the confirmation.


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