1985 gl1200 carb sync question


Information and questions on GL1200 Goldwings (1984-1987)
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supercharger
Posts: 4
Joined: Sat Jan 25, 2020 7:51 pm
Location: paducah kentucky
Motorcycle: 1985 honda gl 1200 interstate

1985 gl1200 carb sync question

Post by supercharger »



when i go to sync these carbs cylinder # 4 left side of bike rear the lbs are about 17 lbs and the other 3 are about 5 lb and they all match.i read that # 4 is not syncable and there is only 1 adjustment screw on that side..do i need to get all 3 to match # 4 or just match all three and i am good..i have already fouled a set of plugs and thinking that when i cleaned it i did something wrong i pulled them back out..when i pulled the intake off # 2 cylinder i had fuel setting on top of valve all others no fuel..far as binch sync i used a plastic razor blade and adjusted the screws to that thickness is that ok too to get me started..i am new to this site and i am really mechanically inclined and i amd embarressed to ask..also checked my floats and set them to 7.5 mm and removed the pilot screws and they are set at 2 1/4 turns like manual says and that is what they where when removed...please help me in any way you can please..thank you...the # 4 cylinder has me stumped..also i have a another 85 gl1200 interstate and checked it and it is the same way..i set all 3 carbs except # 4 to about 5.5 lbs and number 4 was like 17 lbs..i have read till i am blue in the face and the fumes about got me last night..i live in paducah ky..thank you again



OldCrow
Posts: 7
Joined: Wed Jun 05, 2019 5:39 pm
Location: Knox, Maine
Motorcycle: 1987 GL1200 Aspencade, 1981 BMW R100RT

Re: 1985 gl1200 carb sync question

Post by OldCrow »

I don't know what kind of synchronization tool you are using to get lbs. My experience is looking for a vacuum reading in either in/mm of Hg. My shop OEM shop manual for my 1987 GL1200A says to sync to the number 4 at (1.6inch)40mm HG.

My manual also says the pilot screws are set to 2.25 turns 49state as INITIAL then fine tune with RPM Drop check while adjusting each pilot. Before moving on to the sync.

OC

supercharger
Posts: 4
Joined: Sat Jan 25, 2020 7:51 pm
Location: paducah kentucky
Motorcycle: 1985 honda gl 1200 interstate

Re: 1985 gl1200 carb sync question

Post by supercharger »

Thanks for getting back to me.I figured it out.I bench synced the carbs then set pilots at 2.25 set floats at 7.5 mm put on bike start the engine then warm up.
set 2 to 4 then went to # 1 set to match 4 then 3 to match all the others.All are set dead on 9 lbs of vac.bike runs and purrs great.I did notice in front of the engine it sounds like a tensioner wineing or something.bike has been setting and has not been ridden for a while.Should i ride and see if it quiets up a bit.this was a 1 owner bike but owner is deceased now and seems they took care of it.i think i know the awnsers but would like feedback from others.this is first goldwing.i love this sit and it is very helpful and true down to earth people in this little club.Let me know .my name is jeff and i appreciate all..

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julimike54
Posts: 579
Joined: Sun Feb 01, 2015 12:21 pm
Location: Euless, Texas
Motorcycle: 1986 GL1200A original owner
2016 HD FLTRU

Re: 1985 gl1200 carb sync question

Post by julimike54 »

My belt tensioners were whining after a prolonged rest. I ordered 2 new ones and by the time they arrived the whine had diminished. By the time I found the time to replace them, there was no noise at the tensioners, checked with a stethoscope, so the new ones are still in the box. I'd run a few miles with the ones you have and see if they don't get quieter.
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Riding anything is a good day!
Mike

supercharger
Posts: 4
Joined: Sat Jan 25, 2020 7:51 pm
Location: paducah kentucky
Motorcycle: 1985 honda gl 1200 interstate

Re: 1985 gl1200 carb sync question

Post by supercharger »

Thank you bunches will do that.As far as the carb sync it turned out very nicely.Thanks again.



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