1976 GS750 VM26 Carb settings

[Guest]

Working on restoring a 76 gs750 with stock mikuni vm carbs.

I need new main jets - they're all missing for some reason - what size do i need?

The pilot jets and air adjuster jets have been removed. how many turns out should each of these be? Stock exhaust and airbox.

What routing should the hoses be? There are multiple vacuum lines on the carbs, but I dont know if they should be capped or should go somewhere special.

[Agemax]

a 76 GS750???? i think you may be out by a few years, check again. it has to be 78 onwards......maybe.

[OldVet66]

Welcome to the forum. I believe that was the first year for the GS750. They also were selling the GT750 that year. The main jet is a 105 and pilot jet 22.5 according to the stock factory specs. They list the pilot screw as 1.25. The air jet is adjusted for highest idle, roughly twice the pilot jet initial setting to get the bike started. There is only one vacuum line, carburetor #3 (from left to right as you sit on the bike) for petcock vacuum to open the petcock . The brass barbs on #2 and #4 are vents that rout over the air box I believe. I'm jetted for pods so mine are just left off so I never paid too much attention to those vent lines. The four on the bottom are bowl overflow lines routed through a square open casting on the right rear side of the transmission on my bike, not quite sure if it is the same on the 750. At any rate they drain below the bike in case a bowl needle sticks and overflows gas. This is a good site to find model history: http://www.suzukicycles.org/All-Suzu...ki_models.html

[Agemax]

oh ok, i just couldnt find a 76 GS750 on the alphasports website, just a GT750 stroker

[splazoid]

oh ok, i just couldnt find a 76 GS750 on the alphasports website, just a GT750 stroker

And thats why I need help looking this stuff up . The bike was manufactured in 7/1976, engine number 435 . This model history page details the '76, but not with the info I need.

I've now read 100 mains, 105, and 125, and two dealers I called didn't want to touch these carbs by even making a suggestion.

If anyone has an idea on the two settings for the fuel and air adjusters, I would appreciate it.

[chuck hahn]

Go to the top of the carbs section and click on the STICKY at the top.

I have that bike and have had the 78 E model to. Pilots ( bottom ) are set at 3/4 to 7/8 out from lightly seated and Mixture screws are at 1 3/4 to 2 out from bottom.

Dont hold me to it, but i think the mains are 95 and pilots are 17.5 They went up on the mains to 102.5 in the 78 E models. I have a brand new ( 102.5 ) in the package set if you want them

[chuck hahn]

Here..find your ENGINE number ( down on the flat by the top of the clutch cover) and reference this chart..

http://free-pu.htnet.hr/medo/carbs.jpg

[chuck hahn]

Oh...and I have read that there were 76 GS 750s in the Canadian testing markets back in the day...BUT..the "official" model launch was in the spring of 77. My 77 was actually built in August of 76.

[OldVet66]

 and two dealers I called didn't want to touch these carbs.

Don't let a dealer touch your carburetors. There is more than enough information and help on this site to have you rebuilding them yourself. There is also a lot of horror stories about Dealer rebuilds. If you do it yourself you will save tons of time and money. Just ask me how I know.

[splazoid]

 and two dealers I called didn't want to touch these carbs.

Don't let a dealer touch your carburetors. There is more than enough information and help on this site to have you rebuilding them yourself. There is also a lot of horror stories about Dealer rebuilds. If you do it yourself you will save tons of time and money. Just ask me how I know.

Oh, I wouldn't let them rebuild them, but they sent me away after even a short conversation. Glad this forum is so helpful compared to others i've been on.

[azr]

I've got an original 1976 GS750 in the shed, even know the original owner maybe it was a Canadian thing.

[OldVet66]

Your information is in my first post, don't know if you caught it I was editing a few things.

[Steve]

And thats why I need help looking this stuff up . The bike was manufactured in 7/1976, engine number 435 . This model history page details the '76, but not with the info I need.

The GS750 page on suzukicycles.org says:

Presented in October 1976, GS750 was the the first four-stroke engined Suzuki motorcycle after 22 years of only 2-stroke engines from Suzuki.

It stands to reason that, in order to present them in October, at least a few of them had to be made before October.

Yeah, July was quite a bit before October, but they had to start some time. And, with a serial number of 435, it was DEFINITELY one of the early ones.

That sounds like a very good candidate for a proper, FULL restoration.

.