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Head Service advice. #754406 10/29/18 1:02 am
Joined: Feb 2018
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Tracey Spear Offline OP
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I've removed the valves from the head. They are pretty rough. Both the seats and the edges of the valves have considerable rust/corrosion. After all this motor has sat for 30 some odd years. I plan to order new valves, and springs for sure. However I'm unsure about the guides. I took several measurements of the guides using a telescoping gauge and a mic. All measured within spec .0312-0.313. Should I replace guides just because, or are the originals serviceable?

Recommendations requested for quality valves and springs.

Once I get the parts I'll turn over to a machinist to do the rest.

Thanks y'all.

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Re: Head Service advice. [Re: Tracey Spear] #754436 10/29/18 8:30 am
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kommando Online Content
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Changing guides carried a risk of destroying the head, if the guide bores are in spec leave well alone.

Re: Head Service advice. [Re: Tracey Spear] #754440 10/29/18 9:50 am
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Mark Parker Online Content
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If the guide bores are not in spec I've found K-liners the best when used with nitrided valves(black) MAP has nice ones. I only ever remove guides to work on the ports. The K-liners can run close tolerance and are more true being machined in the head and will last well.


mark
Re: Head Service advice. [Re: Tracey Spear] #754465 10/29/18 1:55 pm
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bodine031 Offline
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mite want to check in with www.shopevengineering.com.

Re: Head Service advice. [Re: Tracey Spear] #754482 10/29/18 4:48 pm
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Tracey Spear Offline OP
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I have received so much help from this forum. I've got most of the parts cleaned, and am starting on parts list. Since this forum has been so helpful I've decided to source all my parts from sponsors. Unless I come across something in a swap meet or some thing.

Therefore I've requested a quote from EV. I will have to see how that fits into the budget, what with shipping and all.

Re: Head Service advice. [Re: Tracey Spear] #754489 10/29/18 5:42 pm
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DMadigan Offline
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When replacing the guides the shop has to be careful to remove any carbon buildup around the outside before driving them out. Also, if the guides are bored out within a 1/16" or so of the O.D. there is less chance of dragging head material out with the guide. Oversize guides are available. Depending upon how you plan to use the bike, the more interfaces between the guide and head, the less heat transfer since you never get 100% contact between surfaces.

Re: Head Service advice. [Re: Tracey Spear] #754492 10/29/18 6:37 pm
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PFribley Offline
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Clean them up and put it back together.


Moderated by  Allan Gill, Jon W. Whitley 

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