1987 Gl1200 engine into 1982 gl1100 frame


Information and questions on GL1100 Goldwings (1980-1983)
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lpburke86
Posts: 10
Joined: Sun Sep 16, 2012 1:24 am
Location: Rockport, Tx
Motorcycle: 1981 GL100I Interstate

1987 Gl1200 engine into 1982 gl1100 frame

Post by lpburke86 » Mon Jan 07, 2019 7:42 pm



Pre-Harvey I had a fully restored GL1100 Interstate. Harvey flooding came and screwed the engine beyond reasonable repair.

Today I happened on an almost ridable 87 gl1200 ascenpade for free. Problem is that it has no title, and is ugly as hell.

I am wanting to swap engines.

The 1200 is a complete bike with clutch issues and minor electrical issues, but it does start and run.

The 1100 is a complete bike minus the engine.

What issues am I going to run into... what other parts am I going to have to retrofit to make it work properly... and what kind of frame modifications am I going to have to make for it to fit?

Is there anywhere where I can get more information about doing it without wading through pages of posts telling me to just find an 1100 engine?



DaveO430
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Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: 1987 Gl1200 engine into 1982 gl1100 frame

Post by DaveO430 » Mon Jan 07, 2019 9:12 pm

It's really no problem, it bolts right in. The only problem is the ignition system. If it were my project I would use the entire 1200 ignition. Should be no problem to wire in the ignition module from the 1200.

DaveO430
Posts: 1120
Joined: Fri Jan 02, 2015 7:28 pm
Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: 1987 Gl1200 engine into 1982 gl1100 frame

Post by DaveO430 » Mon Jan 07, 2019 11:06 pm

And I forgot about the driveshaft. The 1100 uses a snap ring to hold the coupling to the output shaft, the 1200 uses a spring in the driveshaft to hold the coupling forward. The usual fix is to change the output shaft but I think I would either drill and tap the coupling for a set screw or put a spring in the driveshaft.

User avatar
lpburke86
Posts: 10
Joined: Sun Sep 16, 2012 1:24 am
Location: Rockport, Tx
Motorcycle: 1981 GL100I Interstate

Re: 1987 Gl1200 engine into 1982 gl1100 frame

Post by lpburke86 » Tue Jan 08, 2019 12:22 am

So there are no frame modifications needed? I had read somewhere that there were...


I am thinking that I should get this 1200 into good mechanical condition before trying to make the switch... Find out why the clutch is sticking, why the rear wheel won't spin when it appears to be in neutral, etc... Speaking of which... any ideas? When I picked up the bike today, we loaded it with a forklift, and now I need to get it off the trailer so I can use it to haul lumber Wednesday, and the rear wheel not spinning makes that near impossible....

It goes go into gear and the wheel spins in gear on the center stand while the engine is on, but that doesn't help it go backward..... it would be a long trip to try to roll forward enough to end up at the back of the trailer. :D

DaveO430
Posts: 1120
Joined: Fri Jan 02, 2015 7:28 pm
Location: Amity. Ar
Motorcycle: 2010 GL1800
2004 Suzuki DR200

Re: 1987 Gl1200 engine into 1982 gl1100 frame

Post by DaveO430 » Tue Jan 08, 2019 7:15 am

Brake stuck would be my guess.



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