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GSX-R 750 Pictures of how I cleaned and adjusted the carburetors on my 1985 1986 1987 Suzuki GSX-R750 motorcycle.


These carbs are ganged. Bolted together and their function syncronized. How that works is something like this.

But first, lets pay some bills:
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  1. Here is the choke rod. Choke rod? That can't be right. Anyway, the choke rod controls all 4 starter plungers on all 4 carbs. This ensures that all carbs get the same amount of "choke". The choke rod passes through this hole, where this ball bearing presses on it to keep it where you set it. When I try to install the rod, it pushes the ball bearing out of its seat. So I used that handy ice pick again to press the ball bearing down into the spring while I installed the choke rod.
    Choke rod     Ball Bearing     Ice pick


  2. Similarly, all 4 butterfly valves are operated sycnhronously. The linkage between butterfly valves can be adjusted. To do this, I loosened the likeage between carbs 2 & 3.
    Lock Nut


  3. I adjusted the synch between carbs 2 & 3 by turning the balance screw until both butterfly valves exerted the same pressure on the little wires. I was careful not to let the wires scratch the butterflies or the throat of the carbs.
    Synch Adjust Screw     Butterflys, Butterflies?


  4. This balance screw spring was out of place and not putting the proper pressure on the next carburetor. I straightened out the spring and reinstalled it correctly. Then I balanced those carbs. This is a bench balance. Balancing them with the engine running using a vacuum gauge will generally yield better results.
    Balance Screw Springs     Balance Screw Lower Spring     Balance Screw and Upper Spring


  5. Next I sold out to make 02ยข so I can fulfill my lifelong dream of owning a 1986 944 with blown head gaskets.
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    But no minivans!


  6. Then I finished my beer.
    Beer

All 5 pages dissecting carbs:
Carbs1_Remove
Carbs2_Description
Carbs3_Disassembly
Carbs4_Synchronize
Carbs5_Floats


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Disclaimer: The technical information in these documents is provided without any warranty whatsoever and at no cost.   All information is in general terms and is not meant to apply to your particular situation, be current at the time you read it, or even be correct in the first place.   Improperly maintained vehicles can lead to serious injury, death, or unavoidable accidents. The author is not responsible for any errors on this site, and does not make any claim at all about the validity, safety, or veracity of the information contained on this website. Any work you choose to do or not to do on your vehicle is done at your own risk. The information on this site is not intended to serve as a replacement for professional advice, professional workmanship, dealer service, union labor, or psychological counseling.   The author disclaims any and all liability directly or indirectly arising from the application or use of any information or idea contained on this or any other web site.   By opening this page, you agree to never sue anyone ever or allow anyone to be sued on your behalf.   The appropriate professional should be consulted regarding your specific condition.    BeerGarage.com does not take responsibility for the information posted on other sites to which it links.

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Last modified: 11/25/2014
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