Changing engine size 1200 => 1100 frame? - Steve Saunders Goldwing Forums

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post #1 of 579 (permalink) Old 02-03-2016, 08:19 PM Thread Starter
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Changing engine size 1200 => 1100 frame?

My bike has been down past couple years, but I now have access to a 1984 gl1200, I need to know if the carbs from my gl11 will fit the 1200 engine.
From what I was reading in the forums that engine should bolt right up. The engine in pic looks like starter is still on it but can't tell for sure. I doubt my starter will fit. Has anybody else done this on here? turning the 1100 into 1200?
How much stronger is the 1200 compared to the 1100?
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post #2 of 579 (permalink) Old 02-03-2016, 08:30 PM Thread Starter
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gl1200 engine

Another question I have is how hard would it be to hook up the hydraulic clutch, or would it be better to hook up the cable clutch?
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post #3 of 579 (permalink) Old 02-03-2016, 08:46 PM
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I wouldn't bet on the "bolt right up" thing.
I doubt if the carbs will fit, and, you will need to get all the plumbing for the hydraulic clutch.
There are people who stuff the 12 motor into an earlier machine but you should just find a motor from an 11, if you need a motor. It's easier.

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post #4 of 579 (permalink) Old 02-03-2016, 08:59 PM
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The 1200 engine is wider than the 1100 engine so no they won't fit.

There's also the issue with the ignition system which is totally different between the two.

Advise given here is free and comes with no warranty "Caveat emptor"

Ken.
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post #5 of 579 (permalink) Old 02-03-2016, 09:04 PM Thread Starter
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gl1200 engine

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Originally Posted by westgl View Post
That Is good you could swap the 84' GL1200 engine into that GL1100 frame.

that 84' GL1200 is a one year engine it is a cross between a GL1100 and a later GL1200.

Think of the 84' GL1200 as a larger displacement GL1100.

The 84' GL1200 has a Clutch & trans like the 83' GL1100.

Your 84' engine has a Hydrualic slave cylinder on the rear of it, you could put hydraulic clutch on your GL1100 you would need a hyd. clutch master from a salvage yard.

Or you could pull the Cable pull clutch cover, off of the GL1100 and put it on the 84' GL1200 engine to make it a cable pull clutch.

What I am saying is you have a GL1200 that is more like your GL1100 than the 85' and up GL1200 are.

That is good for you as they are like engines, if it were to have a 85'-87' GL1200 they would be to much different, not much swappable

The 85' GL1200 and up Clutch & transmissions are way Different.
This is from forums here
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post #6 of 579 (permalink) Old 02-03-2016, 09:26 PM
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What I meant by "They won't fit" is the carburetors to the engine not the engine to the frame.

Advise given here is free and comes with no warranty "Caveat emptor"

Ken.
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post #7 of 579 (permalink) Old 02-03-2016, 09:39 PM Thread Starter
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Damn, I don't have the carbs to 1200, I just got great deal on a 1200 engine
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post #8 of 579 (permalink) Old 02-03-2016, 10:05 PM
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I have some '85 carbs (CA) and all of the hydraulic lines for the clutch. The master is rough but may be salvageable. The carbs will need cleaning.

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post #9 of 579 (permalink) Old 02-04-2016, 10:29 AM
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If you could find some heavy duty radiator hose that fit the carbs and take the rubber of the 1100 intake runners, cut the hose to fit and clamp it on the runners and carbs the 1100 carbs could be made to work. Then you have the problem with the ignition system. The 1200 PGs could be wired to the 1100 system but there would be no timing advance. You would have to get an ignition module for a 1200 and wire it into the 1100 system and run a vacuum line to it. If it is an 84 engine I think the 1100 advance unit could be substituted.

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post #10 of 579 (permalink) Old 02-04-2016, 08:50 PM Thread Starter
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what would you want for carbs and hydraulics? Will radiator hose stand up to gas? And the engine is an 84, I picked it up for 200 dollars plus 100 shipping, I am hoping that the starter is attached but not holding my breath. They removed carbs so I would bet starter isn't there. My 1100 carbs were fine, but it has been sitting for last 2 years, so I don't know now.
Not sure how the throttle hooks up yet but will figure it out when time comes.
I just wanna ride again, should be more power
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