Hello and Welcome Ben . I cant say if the carb mix will creat a problem for you . Perhaps we can have a Moderator move this to the Technical forum . there it will have alot more exposure .
Help 78 gl1000 carbs (Tech Question)
I know this Is a beat topic on this forum, but during the process of a complete rebuild and restore of my bike (1978 GL1000) I needed my carbs rebuilt. Got Randakks kit and video. Went to tackle them and well broke a corroded float post. Got a couple full racks of carbs on eBay and junk yard. Then it was my turn for over time at work. So I turned over 4 racks of carbs and the kit and video to a knowledgable local mechanic. I thought all the carbs were 769a but one set was 771a. He used two 769a bodies and two 771a bodies. He built the rack in an X pattern with the 769a diagonal from each other and 771a diagonal from each other. Now to get to the nitty gritty. The bike runs and it pops on the right exhaust. I haven't synced them yet as I was working on other parts getting the rest of it back together. Is this set up going to work for me? Or is it never going to he right. If I have to redo it I will but best case scenario what can I look for once it's synced?
Info of the bike that I will put in my signature here in a bit. Still new to the forums. 78 GL1000 dyna s ignition, dyna coils, dyna wires, motor rebuilt, heads rebuilt, new water pump, new timing tensioners and belts, new gasket kit top and bottom, drag bars, cut fenders, solo seat, repain frame, fixed the drain holes in frame, new lower frame to engine mounts, bare bones wiring with modern fuse panel, reg/rect combo, cleaned gas tank, rebuilt fuel pump, after market mirrors, rebuilt calipers and new stintered brake pads, new thermostat, cleaned radiator, coolant brake and fuel hoses. And many many more things to come and go
Info of the bike that I will put in my signature here in a bit. Still new to the forums. 78 GL1000 dyna s ignition, dyna coils, dyna wires, motor rebuilt, heads rebuilt, new water pump, new timing tensioners and belts, new gasket kit top and bottom, drag bars, cut fenders, solo seat, repain frame, fixed the drain holes in frame, new lower frame to engine mounts, bare bones wiring with modern fuse panel, reg/rect combo, cleaned gas tank, rebuilt fuel pump, after market mirrors, rebuilt calipers and new stintered brake pads, new thermostat, cleaned radiator, coolant brake and fuel hoses. And many many more things to come and go
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You're not going to know, till you know, ya'know?
I'm surprised you bought Randall's kit and video, but didn't buy the post repair kit.
I'm surprised you bought Randall's kit and video, but didn't buy the post repair kit.
I bought the kit and video prior to breaking the post off. Then I started working alot of overtime so I just gave it to the mechanic. So when I got off of doubles I could continue the reassembly. It wasnt until I already had it all together minus the false tank when I realized the carbs were different. Ill be syncing them tonight after work. Built a diy manometer today. It seems like they are pretty close already and I think that once I get them to run the same it's gonna be running rich on the two cylinders with the 771a carbs. Bigger jets in those I found out
Great. Now you'll be driving in circles......:sadguy:it's gonna be running rich on the two cylinders with the 771a carbs. Bigger jets in those I found out
As the mechneck put them on opposite sides it would run like an Army bike "Left, Right, Left,Right...ETC."Great. Now you'll be driving in circles......:sadguy:
Seriously I don't think you'll have problem as the jets are matched to the carburetor bodies not the year of bike.
Well the 769a carbs are off of a 1978 gl1000 and the 771a carbs are off of the emissions version of the 1978 gl1000. Damn California always has to make things complicated. I believe the main jet for 769a is a #120 and the 771a is a #140. But I just synced them and she runs like a top so I don't see any issues. It smokes on one side a little when its being reved up but I think that's a little oil. It's a fresh rebuild less than 45 minutes of total run time in the garage. In theory if it were smoking or running rich it would be put both exhaust as the carbs are opposite running opposite cylinders.
Thanks guys for a little encouragement. Ride on and hopefully I start remembering I have neighbors now. Got a citation at 6am for revving it up too much. However the officer complemented on how the sportster pipes sounded on a goldwing. Deep sound and doesn't sound like a 4cyl goldwing.
Thanks guys for a little encouragement. Ride on and hopefully I start remembering I have neighbors now. Got a citation at 6am for revving it up too much. However the officer complemented on how the sportster pipes sounded on a goldwing. Deep sound and doesn't sound like a 4cyl goldwing.
If a jetting imbalance becomes a issue after a plug-read some miles from now, then adjusting the sparkplugs on a cylinder pair may be the answer.
That's a great idea. I didn't think of adjusting that. I'm putting the new shinko's on tonight. Then I have to fiddle with the clutch. It's sticking together. Everything is new and like a goof I added some oil onto the plates/pads before assembly. Now I think that they might be gummed up a little so I hope I can put a couple miles on it and get some fresh hot oil to separate them cause its currently not engaging. Then ill be off to go for a lovely state inspection. Where ill have to beg the guy to pass all the mods. In pa it is supposed to be exactly stock. Cut fender, aftermarket taillight, side ways lisc plate, aftermarket blinkers, drag bars, and a few other things I've done are apparently illegal mods. But it's a back country custom shop so they usually let me get away with things. So we'll see. Ill update after I put some miles on it if the carbs work out. I'd hate to have to buy another set and another kit from randakk. Love the parts he sells but 150 for a kit and 100 for another carb set are gonna put me over budget. I sold all the original parts to make up cost and I'm at 1500 for the build which includes the 300 I paid for the goldwing cause she was in many many boxes and pieces.
Hay back up and think about this!you bought the same kits for all carbs right?so the jetting is the same , the only DIF. could be the MM.bore of the carbs.that could diff.
No jets in Randakks kits. The old ones are reused.Hay back up and think about this!you bought the same kits for all carbs right?so the jetting is the same , the only DIF. could be the MM.bore of the carbs.that could diff.
Yeah randakk kits are gasket only. It replaces all factory gaskets as well as gives you a new gasket for the petcock. You run cleaners down jets and reuse them. What I'm hoping that I found out is that everything is the same minus the spark gap and jet sizes between the emissions and non-emissions versions of the carbs. Hopefully he realized when I had him do it and just out the correct jets in the wrong carbs. Some of the carbs were pretty much junk and the aluminum cast bodies were actually deteriorated. I synced them and it seems to run like a champ. I got all the body work and the solo seat and crash guards on as well as my new tires and brakes. So hopefully if all goes well I will be able to take her out and see what a fresh rebuild feels like on the naked wings. By the way don't ever throw something away cause you are gonna get a new one...some parts are really hard to source for these. And I seem to put all the hard parts in the trash. And sometimes I dumpster dive my own dumpster looking for that littler washer that is a specialty washer and not something I can get at my local hardware store.
Thanks guys. Ill bring back a road report before next week.
Thanks guys. Ill bring back a road report before next week.
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