look at these gl1000 carbs


Information and questions on GL1000 Goldwings (1975-1979)
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winguyjo
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look at these gl1000 carbs

Post by winguyjo »



i know nothing about these carbs other than i was told they are 1978 gl1000 ...

look at the bores where the aluminum puck belongs ... in carb #2, (the first pic) one of the three holes is much larger than it is in the other 3 carbs.
is this normal ?






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Maz
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Re: look at these gl1000 carbs

Post by Maz »

I'm gonna guess that someone has stripped those carbs before and, as that puck was difficult to remove, they drilled it to use a screw to get it out, but drilled too deep.
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winguyjo
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Motorcycle: wing1 : 1982 gl1100 interstate; resurrection complete. SOLD
wing2 : 1980 gl1100 interstate; resurrection complete. SOLD.
wing3 : 81gl1100i frame/82gl1100a engine/81cb900 bits. resurrection complete. naked. SOLD.
wing4 : 1977 gl1000 black w/ blue pinstripes; resurrection complete. SOLD
wing5 : 1977 gl1000 black w/gold pinstripes; nearly roadworthy when purchased, NOW RIDING.
wing6 : 1975 gl1000 blue; SOLD

Re: look at these gl1000 carbs

Post by winguyjo »

that was my guess, too, but since the hole was so clean and even, i wanted to make sure that it wasn't factory. wouldn't make any sense for honda to make it that way but one never knows. now i gotta figure out what to do there. i am thinking fill it with lead and smooth it off as best i can.
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Maz
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Re: look at these gl1000 carbs

Post by Maz »

The puck will seal it anyway. That's what it's for.
Maz
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winguyjo
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wing2 : 1980 gl1100 interstate; resurrection complete. SOLD.
wing3 : 81gl1100i frame/82gl1100a engine/81cb900 bits. resurrection complete. naked. SOLD.
wing4 : 1977 gl1000 black w/ blue pinstripes; resurrection complete. SOLD
wing5 : 1977 gl1000 black w/gold pinstripes; nearly roadworthy when purchased, NOW RIDING.
wing6 : 1975 gl1000 blue; SOLD

Re: look at these gl1000 carbs

Post by winguyjo »

ok . i don't understand what those 3 tiny holes are for.
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Maz
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Re: look at these gl1000 carbs

Post by Maz »

I believe they are the starting point for some of the internal drillings. Various jets / holes will be joined by them but the starting point for the drilling is blanked off. That's as I understand it, but happy to be corrected if I've misunderstood.
Maz
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winguyjo
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Motorcycle: wing1 : 1982 gl1100 interstate; resurrection complete. SOLD
wing2 : 1980 gl1100 interstate; resurrection complete. SOLD.
wing3 : 81gl1100i frame/82gl1100a engine/81cb900 bits. resurrection complete. naked. SOLD.
wing4 : 1977 gl1000 black w/ blue pinstripes; resurrection complete. SOLD
wing5 : 1977 gl1000 black w/gold pinstripes; nearly roadworthy when purchased, NOW RIDING.
wing6 : 1975 gl1000 blue; SOLD

Re: look at these gl1000 carbs

Post by winguyjo »

well, we were right with the "stuck puck" hypothesis. he actually drilled through 2 of them (i found the damaged ones in a separate container). on carb #2 he obviously went too far but on the other puck he went all the way through the puck but didn't contact the carb body itself. the throttle plate is right there but fortunately it looks like it didn't get nicked by the drill bit. if i ever have to do this at least now i know that the pucks sit "raised" from the carb body, so if one is careful not to drill too deep this extraction method is quite do-able.
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Maz
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Re: look at these gl1000 carbs

Post by Maz »

I had to use this method myself. Sharp drill bit, nice and slow and a bit of tape round the bit to mark the maximum depth that you want.
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winguyjo
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wing2 : 1980 gl1100 interstate; resurrection complete. SOLD.
wing3 : 81gl1100i frame/82gl1100a engine/81cb900 bits. resurrection complete. naked. SOLD.
wing4 : 1977 gl1000 black w/ blue pinstripes; resurrection complete. SOLD
wing5 : 1977 gl1000 black w/gold pinstripes; nearly roadworthy when purchased, NOW RIDING.
wing6 : 1975 gl1000 blue; SOLD

Re: look at these gl1000 carbs

Post by winguyjo »

thanks for all the feedback , maz. i am still concerned about that big hole though. the 3 tiny holes don't appear to be access portals for the factory to drill other internal passageways. looking at it, they are right where the throttle plate touches the carb body when the throttle is closed, and my guess is that they are using venturi vacuum to draw fuel for the idle circuit ... but that's only a guess, based on my limited understanding of carbs in general. hoping a carb guru can advise whether this now significantly enlarged hole should be repaired somehow or will it have a minimal effect on the carb performance.
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Maz
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Re: look at these gl1000 carbs

Post by Maz »

Are you saying that if you look into the carb throat, you can see the oversized hole at the base by the throttle plate? If so, then yes, I would be concerned. You could do worse than PM 'Old Fogey'. He owns Wingovations and has stripped/repaired more of these carbs than I have had hot dinners. It may be that you will need a replacement carb body.
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dingdong
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Re: look at these gl1000 carbs

Post by dingdong »

copied from Randakks.
This "puck" is a critical part about the size and shape of a large aspirin tablet and is located beneath the fuel bowl gasket in the main carb body. It's necessary to cover the access point used in the manufacturing process to create the by-pass transfer ports for the idle circuit.
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winguyjo
Posts: 415
Joined: Sat Aug 11, 2018 9:26 pm
Location: b.c. Canada
Motorcycle: wing1 : 1982 gl1100 interstate; resurrection complete. SOLD
wing2 : 1980 gl1100 interstate; resurrection complete. SOLD.
wing3 : 81gl1100i frame/82gl1100a engine/81cb900 bits. resurrection complete. naked. SOLD.
wing4 : 1977 gl1000 black w/ blue pinstripes; resurrection complete. SOLD
wing5 : 1977 gl1000 black w/gold pinstripes; nearly roadworthy when purchased, NOW RIDING.
wing6 : 1975 gl1000 blue; SOLD

Re: look at these gl1000 carbs

Post by winguyjo »

thanks for the replies ...

yes, the (now) oversized hole is in the base of the carb throat, you can see it clearly in the first pic and you can also see the shiny throttle plate peeking through behind it.

the puck isn't going to be an issue; the PO did what i consider to be an acceptable repair by filling the holes that he made in them with solder and, at any rate, i am sure that i have some spares in the hoard somewhere.

will check out 'old fogey'. thanks.


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