Valve job questions?

[Guest]

After 25 years of hibernation I have decided to restore my 1981 GS 1100E. After destroying the origional engine I put a motor from a 1082 in it that had zero miles on it. I might have put a thousand miles on it but I doubt it. I am going through the entire motor. I am having a valve job done on it now. Can I use the old valve springs and retainers? Do I need to replace anything like valve seals?

[Nessism]

Why would you do a "valve job" on an engine with 1000 miles on it? This makes no sense.

Yes, replace valve stem seals since 30 year old rubber parts are a big risk. Your valve springs and retainers can be reused, particularly on a low mileage engine.

[Steve]

What's a "1082"?

Maybe you mis-typed and meant "1982"?


.

[BassCliff]

Greetings and Salutations!!

Hi Mr. Earl Jaguar,

As long as the valve springs are within the service limit spec, why not reuse? But yes, replace all of the 30 year old rubber parts, i.e. intake boots and O-rings, etc. For more suggestions, hit the links below.

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[Earl Jaguar]

Valve Guide O-Rings

Ed,
While turning the motor over with the plugs out I dropped an aligator clip down the #3 cylinder and messed up the seat on one of the valves and took a chunk out of the piston! STUPID HURTS!

Steve,
The real reason for the restoration is that it is 930 years old! Sorry, fat fingers.

All,
After driving out the valve guides can they be re-used with new o-rings? The shop manual says to ream out the guide holed and install oversized guides. Is this necessary???

[DanTheMan]

Don't, Don't, Don't drive out the valve guides. You do that with an engine with many miles and worn valve guides. You shouldn't need to do that step on such a low mileage engine. You also don't need to replace all the valves or seats, maybe just the damaged one if it can't be ground out.

[koolaid_kid]

IMHO, if the machine shop you are going to take the head to cannot answer these questions for you, I would take it to another shop. I took mine to someone in Ohio, and he not only answered all my questions, but made excellent recommendations at minimal cost to me. He covered everything you asked about and a lot more.

Oh, and welcome to GSR.

[silverhorse47]

Yes, it is necessary. Properly, the head is heated then the guide alone is cooled, then drifted out. After that, a minimal amount of metal is removed from the hole with a bit/reamer, perfectly centered over the hole that houses the valve stem.......? and then the new guide is shrunk by cold and drifted into place. Then the valve seats are reground and etc. If you have this done by the wrong machinist a mating disaster is possible.
I am not sure how you got your valve guides out, but if you aren't certain, I'd find a machinist to advise you. Though I could be wrong, and just beating them out and bashing in new ones may work. If so, let me know please.
If you love your bike, take it to a machinist with the right equipment and thirty years experience. *S*
S.

[SqDancerLynn1]

1082 ? isn't that the size of the 1100 motor ? Like said DO NOT DRIVE THE valve guides out !!! You need to remove the valves and replace the valve seals.. If you did remove the guides ? It may be cheaper to find another head, or at least find a good machine shop to see if it is fixable.
If it is a terminology problem and you only drove the valves out your ok...