Suzuki GP100 carb woes

GP100Kid · L Plate Warrior Joined: 13 Dec 2009 Karma :

Hi all, I am new to motorcycles after years of working on classic cars. I have recently purchased a trio of Suzuki GP100s. I have a carb issue with one bike and have tried to refer to the other two for a resolution but they are earlier models and have a different carb.
The bike I have the issue with is a 1986 model which someone abandoned an engine rebuild on. I have fitted a newly built engine which came with the bike but am unsure to which pipe fits where on the carb. There are two larger brass inlets of the left of the carb body, one points straight up and one at a 45 degree angle. Behind these is a smaller inlet which I assume is the oil feed? The right hand side of the carb has two overflow hoses still in situ, I assume these are just contained within the casing and dont connect to anything on the other end? I hope this makes sense! Got the new motor bolted in, wired up etc just need now to do the final set up, put some oil in and it should be away again!
Thanks for your help in advance! Very Happy

stirlinggaz · World Chat Champion Joined: 22 Jul 2007 Karma :

Hi,
~what carb is it?
(should be narked on the side)
as i should have achematic for it here.
your right in thinking 1 will be fuel inlet & another oil inlet.
iirc, its 2 smoke, right?
so the thinner inlet, probably at an angle will be the 2t feed.(any others should be breathers)
didnt these bikes have 6v electrics?
i vaguely remember them, but never owned one.
let us know how you get on.
cheers,
GAZ

GP100Kid · L Plate Warrior Joined: 13 Dec 2009 Karma :

Hi mate, cheers for getting back to me! I will have a look on the carb and get back with the details, was stupid of me not to have thought to do that in my original post Confused

GP100Kid · L Plate Warrior Joined: 13 Dec 2009 Karma :

Have had a look on the carb and it just says 'Mikuni' no serial number etc visible. Its similar to this one........

https://cgi.ebay.co.uk/SUZUKI-GP100-GP-100-CARBURETTOR_W0QQitemZ190357464839QQcmdZViewItemQQptZUK_Motorcycle_Parts?hash=item2c52306707

Is that any help Confused

Yes the bike is a 2 smoker and it does have 6v electrics Smile

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

I believe this is correct.
____________________
Some shite cruiser. Now with guns and FREEDOM!

GP100Kid · L Plate Warrior Joined: 13 Dec 2009 Karma :

On the inlet on the left, labelled 'fuel' on your picture, I have another inlet of the same bore below it but at 90 degrees to the carb body rather then 45 as the higher inlet is set. Also on mine, the oil feed pipe is behind the upper left hand fuel inlet rather than being on the right hand side of the carb? Will take a pic tomorrow and post it up Very Happy

Many thanks for your help

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

check this out

https://www.cmsnl.com/suzuki-gp100-1983-ud_model13384/partslist/FIG-05.html
____________________
Some shite cruiser. Now with guns and FREEDOM!

GP100Kid · L Plate Warrior Joined: 13 Dec 2009 Karma :

https://i.ebayimg.com/16/!BhUpORQBWk~$(KGrHqUOKjMErzSTSQEZBLInjhmQJg~~_35.JPG

This is the carb I have, obviously this is a rear shot of it. You can see on the right hand side of this pic, the two larger bore pipes I mean, obviously the small pipe entering the carb mouth is the oil pipe and the overflows are on the other side of the carb so what is this mystery second large pipe? (One at a 45 degree angle and one at 90 degrees?

neilo · Derestricted Danger Joined: 07 Jan 2009 Karma :

Hi there are 2 over flow pipes used on the gp100/125 carbs that's what the 2 pipe outlets are for .The carb id number is just behind the tick over screw it will say 39201. This makes it a Mikuni vm22ss which is for the gp100 or 39111. this is a Mikuni vm24ss which is for the gp125 Hopefully this answers your question
Neil

GP100Kid · L Plate Warrior Joined: 13 Dec 2009 Karma :

Cheers Neil, thats a massive help! Thank you Very Happy