Jets for 750

[DannyBoats]

Hello. I'm starting to put a '78 750 on the road. It has a K&N Air filter in the original air box and 4 into 1 pipes. I'm giving the carbs a cleaning/rebuild and see I have 102 main jets, which is what comes with the carb kits. Does anyone know what a good starting point for the Main and Pilot jets would be for this set-up?

[TheCafeKid]

Leave the pilots alone and bump the main to 105 or maybe 107.5. Just depends on altitude And state of tune etc. Might have to move the needle down a notch maybe.

[BassCliff]

Greetings and Salutations!!

Hi Mr. DannyBoats,

A proper cleaning and rebuilding of your carbs should include a nice 24 hour bath in Berryman's chem dip and a new set of O-rings from our friend Robert Barr @ http://cycleorings.com/ . There are many more maintenance tips in your "mega-welcome". Let's get started.
I just stopped by to welcome you to the forum in my own, special way.

If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", the Carb Rebuild Series, and the Stator Papers. Now let me roll out the welcome mat for you...

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

[DannyBoats]

Jets for 750

Thanks! I was pretty sure I needed to go bigger.

[DannyBoats]

Jets for 750

Thanks Mr. BassCliff,
I've been lurking for a good year and a half, which is when I got my first GS, a '79 550L, all stock. Between the manuals for her, and this site I've been able to keep her running well. Late last summer I got a good deal on the '78 750 with 11,000 miles, which I'm just starting to get road-ready. The carbs were gunked-up so I rebuilt them, and she fires-up and idles fine, but the throttle response is slow. I expected the Jets were small with those Pipes. I am rebuilding seized brake calipers now, when done I can see how she rolls. Other than getting the carbs set-up right, and the brakes, she's in great shape.
I retired my car one year ago and use my 550L as my everyday rider, all year, excluding snow/ice days. She's a great bike and I love her dearly. When the 750 is up and running properly, the 550 will start to get a much deserved complete going over, which means I'll be asking questions.
Thanks for the welcome, and a great site for us GS lovers!
Dan

[TheCafeKid]

Well while I still think you need to bump the mains, keep in mind that with the older VM carbs a little more finese is required to romp on the throttle. Because those carbs are more or less a single stage design, whacking the throttle open, even when in perfect tune, will result in a slight, quick bogging action because you've effectively dumped the vacuum the carbs need to draw air across the jets from the motor. Quick throttling these carbs requires more of a fast smooth roll on than a herky jerky wrist snap. If you get good at it, they're just as street friendly as the CVs. Just takes a little practice