GS850 vm inlet boots compatibility

[GSjohnnie]

Hi, i have a 1980 GS850. i have some vm26ss carbs fitted to it using some modified inlet rubbers off a GS750. ive had it running but it runs very rough. i thought until recently they needed a good balancing but when i attached the vacuum guages only one of the carbs showed a vacuum reading. i think this is due to the gs750 inlet boots that i used.

Is there a uk company that supplies these new or are there any compatible from other bikes that used the same carbs like the early kawasaki z1000?

any info would be greatly appreciated

many thanks, john

[razooki]

I had exactly the same issues with my '80 GS850. It has VM29 carbs and the previous owner used the stock inlet pipes for that year. They fit the head but were too large for the carb spigots so the more I tightened them the more they ripped. I bought some KZ1000 inlet pipes from Z1 and enlarged the holes ( had to open them really because the difference in bolt distance was that big) and fabricated some oval washers. They seem to be OK but I'm still not convinced as it idles fine before a ride but when it gets up to operating temps the idle jumps to 1500 and stays there. There are generic inlet pipes that you can get apparently but I have not gone that route yet because I like the fact that mine have the spigots for car synching.
http://www.denniskirk.com/jsp/tpl/cm...randId=488&np=

Do you have carb spacers? Mine came with carb spacers because otherwise the VM29 carbs won't clear the cam chain tensioner.

[BassCliff]

Greetings and Salutations!!

Hi Mr. GSjohnnie,

Some of the local blokes will have to help you find vendors close to you. But if you don't mind, let me dump a TON if information on you and share some GS850G lovin'.

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Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

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Thank you for your indulgence,

BassCliff

[GSjohnnie]

Thanks for the Welcome info and replies
razooki i have no carb spacers but if i remember correctly i spaced off part of the thtottle spring mechanism which was touching the cam tensioner. ive had the bike a while now but only just getting time again to play with it.

i saw that link in your thread too, was wondering if anyone in the uk has them stocked. i have seen a set of kawasaki ones on ebay and they have the spigots on each inlet which i think would help because as far as i can no1 carb has no vacuum take off so not sure what to do about that yet.