1987 Gl1200 engine into 1982 gl1100 frame - Steve Saunders Goldwing Forums

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post #1 of 22 (permalink) Old 01-09-2019, 11:00 PM Thread Starter
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Arrow 1987 Gl1200 engine into 1982 gl1100 frame

Its been a while since I have been on this forum, but when I got my first wing and it was completely beat up and barely ran, this forum helped a ton to get her going..... but now she died again and I need advice again....

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?
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post #2 of 22 (permalink) Old 01-10-2019, 01:56 AM
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Yes, it can be done with minimal alteration.

Why ain't we ridin'?
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post #3 of 22 (permalink) Old 01-10-2019, 03:16 AM Thread Starter
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Minimal meaning what? Seriously... If I could find somewhere that described the process of someone that documented the process and I could dig through that, I would... But, alas I can't find anything... What I do know is that they made some minor changes to the frame or something, because the 1200 isn't as much fun to ride... So my thinking is that that drive train in a frame that is a bit sportier aught to make one helluva scooter.

Also, If I can remember to take pictures and such, I plan to document it and post it, because where I didn't find anyone else documenting it, I found A LOT of people asking how to do it.....
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post #4 of 22 (permalink) Old 01-10-2019, 06:02 AM
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Here's one https://www.goldwingfacts.com/forums...100-frame.html.
I wasn't yanking your chain on the other forum, only trying to help.

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post #5 of 22 (permalink) Old 01-10-2019, 06:06 AM Thread Starter
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Originally Posted by DaveO430 View Post
I wasn't yanking your chain on the other forum, only trying to help.
I know you weren't... Its just kinda one of those things that I really need as many opinions as possible.
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post #6 of 22 (permalink) Old 01-10-2019, 06:21 AM Thread Starter
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Thank you for that. I thought that I had read almost all of them. That has all kinds of info I need.
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post #7 of 22 (permalink) Old 01-10-2019, 10:38 AM
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Actually, Honda went to great lengths to make the 1200 better handling than the 1100.

Why ain't we ridin'?
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post #8 of 22 (permalink) Old 01-10-2019, 11:09 AM
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Too lazy to read the entire post. It will drop into the frame easily. The 1200’s have a “black box” ignition, which receives input from transmission and vacuum from intake. you will need that.

Your biggest change before you put it in will be adapting the output shaft. The 87 was a one-year output shaft and since your 1100 has a snapring to hold the shaft on and the 1200’s has a spring to keep it in place they don’t work. The 84-86 years you can just trade output shafts, but the 87 is different.

Options:
1. Have a groove cut in the 87 output shaft by a competent machine shop so you can keep your 1100 swingarm and final drive. This one will be quicker. One guy tried it without it and the shaft fell off.

2. Move the 1200 swingarm and final drive, brakes, shocks over to your 1100 frame. You will have a higher road gear for better mpg ( 2.83:1 vs 3.09:1 but the 1200 has a 15” rim vs your 82’s 16” rim). You’ll also have plentiful parts as many 1500’s use similar parts and you can even use a 1500 final drive unit which permits a taller tire (16” vs 15”) All of this requires a little modification. I believe, as best as I recall, you can grind a little off each side of the 1200 swingarm at the pivot and it will work. I did it on a 1000 frame and it was quite a bit.

I would use the 1200 carbs. Easy to clean or rebuild cheaply unless the diaphragms are torn. They have ports to match the heads and better overall flow characteristics IMO. Others will say the 1100’s are better because they’re bigger exit diameters, but the 1200’s have as large an entrance with a little better bell-mouth to for e the charge through the slightly smaller venturi and runners. The 1100 carbs will work but are 1/4” short in width. I just put the elbows correct on one side and tighten the other with wider T-clamps. They may require some jetting changes.

I can’t recall if the air box from the 1200 will work without mods. The filter fits on mine (on a 1000) but not the cover.

There are several similar builds at NGWClub as well as Classicgoldwings.com. Wingrider has a fairly recent build with the problems with an 87 at NGW.
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post #9 of 22 (permalink) Old 01-10-2019, 03:56 PM
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I recognize that engine swap
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post #10 of 22 (permalink) Old 01-10-2019, 04:54 PM Thread Starter
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Originally Posted by Ekvh1 View Post
Too lazy to read the entire post. It will drop into the frame easily. The 1200’s have a “black box” ignition, which receives input from transmission and vacuum from intake. you will need that.
How big of a deal is that to move over?

Quote:
1. Have a groove cut in the 87 output shaft by a competent machine shop so you can keep your 1100 swingarm and final drive. This one will be quicker. One guy tried it without it and the shaft fell off.
Consider that MPG is of little concern to me (unless we are talking 80 vs 35), and due to the way I ride, bottom line speed and acceleration is of much more concern to me, would this be my best option? My fire Chief is a very competent machinist, so for wouldnt be a big deal, and would likely cost me nothing....

Quote:
I would use the 1200 carbs. Easy to clean or rebuild cheaply unless the diaphragms are torn. They have ports to match the heads and better overall flow characteristics IMO.
Thats the plan.... the carbs on my 1100 ended up messed up with the flooding.....

Quote:
There are several similar builds at NGWClub as well as Classicgoldwings.com. Wingrider has a fairly recent build with the problems with an 87 at NGW.
THATS what those sites were named.... I have been beating my head against a wall trying to remember. Thank you.

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Originally Posted by MysticFour View Post
I recognize that engine swap
Im currently on page ten of your thread. How did it work out for you in the long run?
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