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1976 GL1000 2018 DRZ400(15,xxx miles) 2009 Sportster(82,xxx miles and still running strong)
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Discussion Starter #1
These readings indicate a ring job, correct?
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How many miles on the motor,these motors aren’t known to be needing rings for way over 100 /200 hundred thousand miles,get it started,add some marvel mystery oil in the cylinders and some in the oil and run it and then check it again
 

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More info please. Has it been sitting for a long time? Have you had it running? Was the compression test done cold?
 

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1987 GL1200 Interstate
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Sounds more like a cold test with the throttle closed. Do the job right and you may be surprised.

Oh, and it's not a good idea to jump from a running car.
 

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1976 GL1000 2018 DRZ400(15,xxx miles) 2009 Sportster(82,xxx miles and still running strong)
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Discussion Starter #6
Thank you for your input Gentlemen! The bike has been sitting for five years. I have not had it running and the test was done cold with the intake runners unbolted and shimmed up away from the head. The odometer shows 49,500 miles. The spark plug threads on cylinder number three are in need of repair.
 

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Thank you for your input Gentlemen! The bike has been sitting for five years. I have not had it running and the test was done cold with the intake runners unbolted and shimmed up away from the head. The odometer shows 49,500 miles. The spark plug threads on cylinder number three are in need of repair.
Not surprising the compression is low. Get it running and it will probably come up to normal.
 
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Definately run it before anything else, were valve clearances checked first? Possible valve seat corrosion/crap on an open valve.
I have built a few of the fours and its not easy to do plus some parts are getting scarce now
 

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1976 GL1000 2018 DRZ400(15,xxx miles) 2009 Sportster(82,xxx miles and still running strong)
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Discussion Starter #9
Thanks for all your help Gentlemen. Yes, the valves were checked and adjusted before the test. Now to address the spark plug threads.
 

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Thanks for all your help Gentlemen. Yes, the valves were checked and adjusted before the test. Now to address the spark plug threads.
How much repair is required for the spark plug threads? Can you just run a thread chaser through the hole or is it too stripped? If it needs a major repair use an insert and not a Helicoil. Helicoils do not work well in that application.

If you go to an automotive shop and leave a deposit they would have the tools and insert required, Otherwise traileer the bike to them and they might do the job right on the trailer. It is best to have the intake valve open and blow air in the cylinder while you do the drill and tapping. The air blowing out the spark plug hole will keep the metal out of the cylinder that way.

 

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How much repair is required for the spark plug threads? Can you just run a thread chaser through the hole or is it too stripped? If it needs a major repair use an insert and not a Helicoil. Helicoils do not work well in that application.

If you go to an automotive shop and leave a deposit they would have the tools and insert required, Otherwise traileer the bike to them and they might do the job right on the trailer. It is best to have the intake valve open and blow air in the cylinder while you do the drill and tapping. The air blowing out the spark plug hole will keep the metal out of the cylinder that way.

Could also get another head.
 

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1976 GL1000 2018 DRZ400(15,xxx miles) 2009 Sportster(82,xxx miles and still running strong)
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Discussion Starter #12
My plan is to remove the head and deliver it to a reputable, local, automotive machine shop to do the thread repair on it. The number three spark plug threads are seriously in need of repair. Does anybody have a recommendation for a machinist to do the repair, local to 29720?
 

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My plan is to remove the head and deliver it to a reputable, local, automotive machine shop to do the thread repair on it. The number three spark plug threads are seriously in need of repair. Does anybody have a recommendation for a machinist to do the repair, local to 29720?
Many cars, trucks and bikes with aluminum heads have that issue. Most any shop should have no trouble doing the rather simple process. It just requires drilling, tapping, screwing in the new insert and stake it in place. 15 minute job. You can remove the head for the repair but it really is not necessary.
 
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