1980 Gl1100 poor running condition.


Information and questions on GL1100 Goldwings (1980-1983)
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Nbs garage of ND
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Joined: Sat Aug 10, 2019 6:25 pm
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Motorcycle: 1980 gl1100

1980 Gl1100 poor running condition.

Post by Nbs garage of ND » Sat Aug 10, 2019 7:09 pm



Howdy y'all my name is Mike and I'm a founder of a small word of mouth shop in Fargo North Dakota. We go by the name NBS garage, now I don't mean to sound like I'm advertising for myself I would just like y'all to know where I'm coming from. A while back a customer brought me a 1980 GL 1100 that was his father's and he would like to bring back to running condition. Normally I turn away all old Japanese bikes just from the headache that they usually are. Finding parts information excetera. But I made an exception with this bike because it was a family heirloom. Fast forward six months and I am at the end of my rope on this bike. It sat for over 12 years in poor condition exposed to the elements rats living in it snow ice rain the whole shooting match. After having the carbs professionally gone through new timing belts and properly time in the engine scrub the interior of the gas tank new fuel filter new fuel lines new spark plugs went to crank over the bike and she ran like absolute garbage. Discovered that the customer in his own attempts to revive the bike managed to bend a valve so the cylinder head was replaced with an eBay unit that what is removed from a running bike. The valves, cam and mating surfaces of the eBay head were better quality than the head on the bike. Slap it all back together and the bike now runs but shutters horribly and backfires through the exhaust and the carburetor. check the synchronization of the carbs and when it was not backfiring the synchronization level was pretty even across the board. Check resistance on ignition coils got a secondary resistance of 14.3 kohms on one and 14.7 kohms on the other. Primary resistance on both coil came out to be about 2.4 ish ohms. The bike shutters horribly when idling and barely revs at all. It sounds like the connecting rods in the case are battling it out over who's top dog. Is there anything else that I should check on this bike before I give the dreaded call that we have to split your engine or find a replacement?



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DenverWinger
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1980 GL1100 STD Vetter (2005-)
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Re: 1980 Gl1100 poor running condition.

Post by DenverWinger » Sat Aug 10, 2019 9:47 pm

Welcome to the forum, Mike. Sounds like you've done everything right so far....

By your description this almost sounds like crossed sparkplug wires on one side... One coil supposed to go to the front two cylinders, the other to the rears.

Don't remember offhand if it's the left coil or the right that goes to the front cylinders but if you find each coil connected to a front and rear cylinder, switch the wires on one side. if correct, it will run, if no run, switch the wires back and swap them on the other side.

These 4 cylinder 'Wings typically rattle like a bucket of bolts if they aren't running right, it's just the primary chain slapping.

Report back with your findings.... :D
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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Nbs garage of ND
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Joined: Sat Aug 10, 2019 6:25 pm
Location: United States
Motorcycle: 1980 gl1100

Re: 1980 Gl1100 poor running condition.

Post by Nbs garage of ND » Sat Aug 10, 2019 10:39 pm

Check the plug wires there were swapped plugs front to rear. after putting the coils on the correct plugs the bike idles better but still backfires horribly through the carburetors at higher rpm.

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Aussie81Interstate
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Re: 1980 Gl1100 poor running condition.

Post by Aussie81Interstate » Sun Aug 11, 2019 3:56 am

They sound like a bucket of bolts if the sync is not correct and will stumble off idle. My suggestion could well be another carb clean. Backfiring sounds like a blocked jet. Check each float bowl - when on the centre stand and fuel tap off, to measure the volume in each carb bowl. Could be one of the floats is stuck or maybe even overflowing.

good luck

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Maz
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Re: 1980 Gl1100 poor running condition.

Post by Maz » Sun Aug 11, 2019 4:56 am

+1 on the above, but do a compression check too. Could be a poorly seated valve.
Maz


Ironically, Common Sense is the LEAST common of all senses!

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