Carb rebuild? 1985 Interstate


Information and questions on GL1200 Goldwings (1984-1987)
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newoldwing
Posts: 2
Joined: Tue May 07, 2013 10:10 pm
Location: mount royal,nj
Motorcycle: 1985 GL1200 Interstate

Carb rebuild? 1985 Interstate

Postby newoldwing » Tue May 07, 2013 10:48 pm



I traded my race bike (2009 Buell 1125R) for a 1985 Interstate that needs some help. I probably should have waited for a better deal, but its mine now and I am enjoying bringing it back to life.

I had some electrical issues, but after removing 21 lights and about 1000 bad connections i seem to be on the right track.

The motor stumbles badly,vibrates and bogs at low rpm. If i get on it, it smooths out but it needs to be addressed. I was all set to disassemble,inspect,clean and synchronize the carbs(or at least attempt to) but i want to run something by you experienced Goldwing guys.
There is an excellent post from someone rebuilding their carbs and it pretty much walks you thru the whole process which is awesome- thanks!(puffut/virgilmobil)
BUT here is what i noticed....
when the bike runs at normal operating temp( about halfway on the temp guage) the stumble pretty much goes away. It hasnt been warm here yet so it hasnt gotten up to temp all that often. I let it warm up (takes a long time) until its up to temp and it runs pretty well but it after a few mins on the road, the temp drops and it starts running badly. I thought maybe the thermostat was stuck open so i removed it and tested it. I put it in a pot of water , heated it up and it does open and close. It is a 180 degree tstat. The antifreeze was straight antifreeze and seemed very thick so i made an approx 50% solution and reassembled. It did seem to run a little warmer but not all that much/
My question is...Am i barking up the wrong tree with rebuilding/synching the carbs? Has anyone run across these same symptoms? If I apply the choke while riding it runs better but of course revs pretty high between shifts.
I have run it almost empty, ran seafoam through it and seafoamed through the airbox and it helped a little.

Thanks in advance for your help, this is a great Site!



User avatar
virgilmobile
Posts: 7647
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Carb rebuild? 1985 Interstate

Postby virgilmobile » Wed May 08, 2013 12:26 pm

Even a generic Google search about the 1200 yields carb problems and mods needed.
When I serviced and synced mine soon after I got the bike,it ran pretty much like yours.
Ugly till warmed up and then only fair.
A complete cleaning inside,removing the cap to get to the fuel trim adjustment and the mods greatly improved it.At dead cold it will usually run badly...The engine won't process the gas well till the engine hits over 100+ degrees.

At the last running....from dead cold....2 minutes with a little choke in the drive,1/2 mile down the road and by the end of the boulevard it was just a rocket.

I did however start with no mods....just cleaning.The mod was necessary to relieve the 2500 rpm stutter.
As always,only mod the carb if it really needs it...don't just arbitrarily re-jet and alter the metering needle.

newoldwing
Posts: 2
Joined: Tue May 07, 2013 10:10 pm
Location: mount royal,nj
Motorcycle: 1985 GL1200 Interstate

Re: Carb rebuild? 1985 Interstate

Postby newoldwing » Sun May 19, 2013 9:08 am

thanks for your reply virgilmobile I appreciate it. sorry i havent responded faster but life has thrown me a curve...again.
BUT i tell ya what man im digging this bike! I finally have just about all of the accessories removed and its pretty much back to stock..or less. i also removed the hack job radio and cb for now. the dash looks a lil funky with everything missing but its just cosmetics. You know how it is...i wont feel comfortable until i know everything about the bike. I've never owned a motor like this so thia is all very new for me. I worked in a vtwin repair shop and also as a heavy duty equipment service mechanic so I am mechanically inclined but not a master by any stretch of the imagination.
I'm basically broke so i'm doing things a little backwards at the moment. I would love to do a full tune up including belts if neccesarry but as i said i'm broke. Actually, many of the lights i removed are pretty cool so i may try to sell them here so i can have some dough for the tune up.

I do have a question though. The bike runs pretty good(not great) when its warmed up. Good enough to make me second guess a carb rebuild/synch project until i resolve this issue. If the weather is less than 70 dgrees or so the bike cools off drastically when riding. Almost down to the blue section of the guage. Then it runs pretty crappy. It acts like a stuck thermostat but as i said, i've already had it out. Maybe its still hanging open a little when running? I did replace the coolant and the temp issue is the same although i sleep better lol.
I did just come into $200 but i need a rear tire yesterday so i was hoping to score a tire and have enough leftover for a tstat. my hope is to get it running at the correct temp before screwing aroiund with the carbs. whatcha think?

User avatar
virgilmobile
Posts: 7647
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Carb rebuild? 1985 Interstate

Postby virgilmobile » Sun May 19, 2013 12:38 pm

Yea..ya really can't get the carbs right till the engine is stable temp.
They really don't like running very well below 140*.
It's best to sync the at temp(185-190),right before the fan usually comes on.




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