Carb question?

[Anonymous]

Hello all,

I have an 80-gs850g and I have a couple of broken float posts. I am wondering what other yr/cc carbs will slide in as there seems to be alot of 80-85 carbs for sale in different places but not 850's.

I have seen a pic of a set of cv's from an 83 gs1000 and they look to be exactly like mine but I don't want to buy with out knowing if they will swap.

If I remember correctly the 1000 and 850 are identical except CC's? or do they use a larger carb that looks the same?

any help would be greatly appreciated!

[duaneage]

750 and 850 carbs should work, they are 34 mm I believe.

[shaftzuki]

The CV carbs on the 1000's are BS34SS('s) - the 850's use the BS32SS('s), keep an eye out on Ebay for a set of 32mm carbs from another 850. You could also try to repair the broken posts - there are a couple of other members that have done it with some success, I just can't remember who they were!! 8)

[duaneage]

I stand corrected, they are 32, mine are 28 I believe.

I repaired my float posts. I used a ceramic epoxy to build up the area around the post and then a dremel to grind off enough excess to get the bowl back on. No problems so far.

I used the float pin to aligh the tower while it cured, placed a 75 watt bulb nearby to heat the part and speed curing. Ceramic based epoxy is expensive, my father happened to have some. JB weld allegedly fails in a gas environment, there are marine epoxy solutions ( google for sources) that can be had for about 30 dollars, enough to do plenty of carbs.

I also bought another carb as a backup should I need it. I cut a block of wood the right height to support the damn posts so I don't break another.

[shaftzuki]

I stand corrected, they are 32, mine are 28 I believe.

I repaired my float posts. I used a ceramic epoxy to build up the area around the post and then a dremel to grind off enough excess to get the bowl back on. No problems so far.

I used the float pin to aligh the tower while it cured, placed a 75 watt bulb nearby to heat the part and speed curing. Ceramic based epoxy is expensive, my father happened to have some. JB weld allegedly fails in a gas environment, there are marine epoxy solutions ( google for sources) that can be had for about 30 dollars, enough to do plenty of carbs.

I also bought another carb as a backup should I need it. I cut a block of wood the right height to support the damn posts so I don't break another.

I knew we had a member or 2 that had been there .... 8)

[earlfor]

There is a way to repair broken float posts. Assuming the break is below the pin, you can file both broken ends of the post flat. Then drill and tap them for a #4/40 threaded insert. Its like installing a dowel. With it threaded at both ends, once the float pin is inserted, there is no way the post can unscrew itself and come loose. No epoxy is needed.

A steady hand with a drill and good light is needed though. :-)
Blocking the carb in place and using a drill press makes things easier.

For a #4/40 threaded insert, hobby shops carry 1 1/2" long 4/40 bolts. Just snip the head of one of them and thread a nut full length to restore the end threads.



Earl

[Anonymous]

Thanks for the replies guys! I did try jb weld and you are right it fails

I have emailed a couple of people on this site that had 850 parts bikes and carbs. I'll see where that leads, in the mean time I will look for the ceramic epoxy.

The dowel type fix is a good one but unfortunately they are broken at nearly a 45 degree angle or more and I would believe it would be a hell of a time trying to even get the bit started, plus I wouldn't be able to screw it down all the way as the point on the post would be hitting the carb about 1/8 inch before fully seated.

I really appreciate your guys' responses
thanks
John

[Rock]

I had a post welded back on and it has worked great. It was no big deal and saved $$$$.

[duaneage]

The product I used is Ceramic-R metal 1311 made by Belzona inc. I don't know if they sell small quanities to the general public. My dad was a dealer for them years ago and he had some left over from a job he did with it. It uses an activator and is really neat stuff. Lasts about 100,000 years.

Their number in Miami is Toll-Free 1-800-238-3280 if you want to give them a call.