Performance build question

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  • Chuck78
    Forum Sage
    Past Site Supporter
    • Aug 2012
    • 3691
    • Columbus, Ohio
    #31
    I've got no complaints about nicely tuned OEM forks with better springs and emulators...
    You have wire spoke wheels? A 3.50x18 or 4.25x18 rear Excel and 2.50x18 or 2.75x18 (Sun doesn't offer 250 only 275) front rim with Buchanan's s.s. GS spokes is a killer setup

    I've got 3 sets of vintage D.I.D. rims 2.50/3.50 & one set of Suns in same. Great size. I run 130/80-18 or 140/70-18. Only advantage to a 150 on a 3.5 rim is the fatter appearance, it's heavier and has less contact patch on the 3.50 rim.

    Welded crank, better clutch hub, stock or mild aftermarket cam (I'd personally stick with .354" megacycles or .365" Web Cams max for a "reliable" long term build. Others will say you'll have no trouble with the .380" MegaCycles or the .365" Web Cams though.
    .410" Web cams require shim under bucket, which is better if you have big cams and run it hard a lot, but a real pain for valve adjustments (have to remove cams)
    '77 GS750 920cc heavily modded
    '97 Kawasaki KDX220R rugged terrain ripper!
    '99 Kawasaki KDX220R​ rebuild in progress
    '79 GS425​ stock
    PROJECTS:
    '77 Suzuki PE250 woods racer
    '77 GS550 740cc major mods
    '77 GS400 489cc racer build​
    '76 Rickman CR1000 GS1000/1100
    '78 GS1000C/1100

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      • Fjbj40
        Forum Sage
        • Oct 2012
        • 1221
        • Dartmouth Nova Scotia
        #32
        If you don't want to jeopardize the S frame then no bracing should happen. Maybe try and get another frame so you can do that.

        I have owned 3 1000's over the years. My current one is braced with C,D and E in the oldskoolsuzuki link. Max weight increase is 5 lbs with the bracing. I also updated to Bandit running gear. All I can say is I can change my line in a turn with no upsetting the frame. On my first 2 1000's that would have led to a possible bad outcome! This is the most stable 1000 I have owned, maybe it's the newer suspension and radials, maybe I am a better driver (not!) but it is day and night to my first 2 1000's.

        My engine has the Yosh 1085, ported head, stock dialed in cams, VM33 smoothbores, Yosh header, dyna ign, accel coils, welded basket. Weighs in at 461lbs wet, if memory serves me right now. It lifts the front end at a twist of the throttle in first, sometimes it gets very light in second, I weigh 175 plus gear.

        Will VM29's be adequate for an 1100?
        1978 Gs1085 compliments of Popy Yosh, Bandit 1200 wheels and front end, VM33 Smoothbores, Yosh exhaust, braced frame, ported polished head :cool:
        1983 Gs1100ESD, rebuild finished! Body paintwork happening winter 2017:D

        I would rather trust my bike to a technician that reads the service manual than some backyardigan that THINKS HE KNOWS how to fix things.

          Comment

          • Guest
            #33
            The 29mm smoothbores likely will not be enough for the engine when it's all done, but I'm still not sure if I'm doing cams and porting, just because I want to make sure I have a bike I can ride on a trip. If I go with just the pistons the 29's will be fine but if I go with porting and cams I'll likely go with some RS34's.

              Comment

              • rapidray
                Forum Guru
                GSResource Superstar
                • Oct 2006
                • 8195
                • So Cal
                #34
                Rob, PM me your cell # & I will send you pics of the head I did for another build for a guy here. It is a small port head that got big port manifolds & 34 RSs. The ports gained a good amount of airflow and actually GAINED port velocity at the same time. The guy told me the thing runs GOOD too. I also built him a custom clutch hub for his motor, from a 16 valve 1100 hub.
                Ray.

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