GL1200 Valve Guide


Information and questions on GL1200 Goldwings (1984-1987)
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ggiggogg
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GL1200 Valve Guide

Postby ggiggogg » Sun Apr 24, 2016 8:10 pm



Does anyone know GL1200 intake valve guide(12204-371-305) different or same exhaust valve guide(12205-371-305) in dimension.If it different,How different? Now I have not been take off the engine head.Can I use 8 of intake valves on the head.

Sorry for my English,Thank you.



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twocams
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Re: GL1200 Valve Guide

Postby twocams » Sun Apr 24, 2016 8:24 pm

If you are asking if intake valves can be also used for exhaust....NO. The heads are different size.

twocams

ggiggogg
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Re: GL1200 Valve Guide

Postby ggiggogg » Sun Apr 24, 2016 8:53 pm

Thank you twocams

I am asking about valve guide dimension not intake or exhaust valve.I know in different between intake head and exhuast head.

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alanc1100
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Re: GL1200 Valve Guide

Postby alanc1100 » Mon Apr 25, 2016 3:00 am

I just replaced all of mine a couple months ago. They came as a set of 8. I didn't notice any differences in size, shape or otherwise. So after I cleaned them up and ran them through sandpaper attached to a thick piece of glass to ensure flatness, I installed the seals, valves, springs and keepers.
Also, I did a good hand hone on each valve and seat. Put her all together and she works like a dream!

Alan

ggiggogg
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Location: Bangkok, Krung Thep Mahanakhon, Thailand
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Re: GL1200 Valve Guide

Postby ggiggogg » Mon Apr 25, 2016 5:13 am

Thank you Alan.

What did you ran by sandpaper?,8 pieces of your new valve guide and why did you do that? If I guess you got a used set of 8.

Thank you.

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alanc1100
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Re: GL1200 Valve Guide

Postby alanc1100 » Mon Apr 25, 2016 12:12 pm

I ran the head mating surface over the sandpaper. I guess "through" wasn't the best word to use in that situation. You should find or have made a thick piece of glass that you can use to sand the block cylinders.
The valve stem seals were new. Just soak them in engine oil for a couple minutes then install them.
The reason I mentioned the sandpaper was in preparation to reinstall the heads. Two things, one you need to ensure that both sealing surfaces ( cylinder heads and block cylinders) have no gasket or other crud left on the mating surfaces and they are smooth. And two, get a valve lapper tool and lapping compound, lap each valve until each one makes good solid 360 degree contact. This needs to be done before you install the springs.

Hope this helps,
Alan

ggiggogg
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Re: GL1200 Valve Guide

Postby ggiggogg » Tue Apr 26, 2016 8:29 pm

Thank you Alan.
You mean you sandpaper cylinder heads and block cylinders surfaces.You don't do anything with valve guides?

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alanc1100
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Re: GL1200 Valve Guide

Postby alanc1100 » Sun May 15, 2016 3:59 am

I checked each one and only had 2 or3 that was close to tolerance. I checked all valves for stretch. When I put them back in lubricated, there wasn't any side play that I could see. So the knurled brass valve guides are good for at least another 80,000 miles :)




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