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Author Topic: What jetting for 540 VMax carbs on 1981 SRX 440  (Read 248 times)

82SRX500

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What jetting for 540 VMax carbs on 1981 SRX 440
« on: May 10, 2017, 02:48:23 AM »
Guys, need some expert advice.  I have several sets of 540 Vmax carbs standard 1983-87 era.  Elevation is Wi IL.   Airbox, stock pipes, stock everything.  Looking for what has worked for trail riding in the midwest using 540 Vmax Mikuni Roundslides from a Vmax. 38MM. Main Jet, pilot, needle position.  Let me know.... thanks. Jon
Specializing in 1981 SRX 440's 1982 SRX 500's and all Bender Race and Specialty Built Yamaha's

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    YAMMIEGOD 3:16

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    Re: What jetting for 540 VMax carbs on 1981 SRX 440
    « Reply #1 on: May 11, 2017, 12:31:29 AM »
    jon, follow my info on fb. you will be fine. and use early vmax carbs, know tors. 3:16x (yammie tony)
    WELCOME TO YAMAHA HEAVEN. / VMAX 4 800. KICKING ASS AND TAKING NAMES. 5.91 e.t.
    1995 VMAX 4 800. AMERICAN SNOWMOBILER MAGAZINE SHOOTOUT SLED. FASTEST YAMAHA OF ALL TIME. MPH . 105.16mph
    2000 SRX 700 (10.45 @ 121.92 mph on tar) 
    2002 SRX 700 (110mph in a 1000 f.t.)
    1979 SRX 440

    rminier

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    Re: What jetting for 540 VMax carbs on 1981 SRX 440
    « Reply #2 on: May 11, 2017, 12:13:26 PM »
     Couldn't find your FB page 3:16?? I'm sure you have some good info.
    OP, I see you posted the question on the vmax site, too. No doubt you have read the interview there under the "Article Index" about the '82 SRX with the Asst. Prod. Mgr-Snowmobile Tom Berkley.
     In discussing the '81 SRX, he answered:
     "Machines like the SRX, with radical porting and carbs to match, have a tendency to be very sensitive to carburetion. They require frequent adj. to suit the temp and altitude.

     "The SRX has a rather narrow tolerance for fuel mixture".

    "It was an intolerant engine".

    If there was ever a factory engine, IMHO, that deserves an excellent, quick responding EGT probe and gauge set up, this one would qualify.
     Most engines I wouldn't worry....but this may be the exception.
     The expense to install these might save a lot of grief in the future.   8)
    « Last Edit: May 11, 2017, 12:15:13 PM by rminier »
    75 Snojet Astro SS, 79 Kawasaki Invader 440, 82 Blizzard 9500, 83 Yamaha Vmax 540, 97 MXZ 670, and holding...for now.

    YAMMIEGOD 3:16

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    Re: What jetting for 540 VMax carbs on 1981 SRX 440
    « Reply #3 on: May 19, 2017, 02:08:36 PM »
    and block those power jets. 3:16x (yammie tony)
    WELCOME TO YAMAHA HEAVEN. / VMAX 4 800. KICKING ASS AND TAKING NAMES. 5.91 e.t.
    1995 VMAX 4 800. AMERICAN SNOWMOBILER MAGAZINE SHOOTOUT SLED. FASTEST YAMAHA OF ALL TIME. MPH . 105.16mph
    2000 SRX 700 (10.45 @ 121.92 mph on tar) 
    2002 SRX 700 (110mph in a 1000 f.t.)
    1979 SRX 440