Re-bored 79 gl1000


Information and questions on GL1000 Goldwings (1975-1979)
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YukonGold
Posts: 2
Joined: Sat Apr 21, 2018 3:41 pm
Location: Whitehorse Yukon, Canada
Motorcycle: 1979 Honda Goldwing gl1000

Re-bored 79 gl1000

Post by YukonGold » Sat Apr 21, 2018 5:33 pm



Hi to you all,
First of all, love this forum! Invaluable information in this “little” project of mine.
Bought a 79 gl1000 that was unfortunately left sitting for 9 years. Decided to take responsibility for this classic as it deserved a better life than the salvage yard. Saw it had less than 10k on it so thought, how bad can it be?My first mistake was finding this site too late...haha
Read enough posts on here to know that the carbs needed rebuilding.
Did valves after that and tried to sync it. No miracles yet.
Compression test should have been done earlier but what can you do...
All cylinders were under 100 :(
Moving right along, re-bored all four to first oversize with lots of help. Bent conrod and worn down crankshaft bearings made for interesting online research as most of you can imagine. Thanks for bearings R!
New pistons, rings, bearings and replacement conrod.
Question: does the re-bore affect valve clearance, timing, etc?
Any information would be appreciated.
Cheers to you all.



DaveO430
Posts: 613
Joined: Fri Jan 02, 2015 7:28 pm
Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: Re-bored 79 gl1000

Post by DaveO430 » Sat Apr 21, 2018 6:47 pm

No, the rebore 1st oversize is only .010" or .25mm so it won't affect anything. Wouldn't really bother any of that if you could bore it 1/2".

YukonGold
Posts: 2
Joined: Sat Apr 21, 2018 3:41 pm
Location: Whitehorse Yukon, Canada
Motorcycle: 1979 Honda Goldwing gl1000

Re: Re-bored 79 gl1000

Post by YukonGold » Fri Apr 27, 2018 1:33 am

Thanks for the information Dave0430!
Next issue I’m dealing with is 0 compression on 1 & 3...
120 on 2 & 4.
Spark on all coils. Valves seems ok.
I’m thinking timing?
Any info helps. Thanks all

DaveO430
Posts: 613
Joined: Fri Jan 02, 2015 7:28 pm
Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: Re-bored 79 gl1000

Post by DaveO430 » Fri Apr 27, 2018 6:24 am

Recheck the right side cam timing, you may have an oops!!!



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