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Thread: 6 mpg problem solved.

  1. #1


    Default 6 mpg problem solved.

    I am one of several owners on this site of 90's yamaha 600 twin motors that are/were getting poor mileage. It was frustrating to me because when new the sled got 12 mpg. Tried a lot of fixes over the years but none had any affect on mpg. Finally heard of something new(to me) and it sounded like what I needed. It was the main nozzles mentioned by 74Nitro. I'm back to 11 mpg and a happy camper. They are scarce so hurry if you'll need them. Thanks to 74Nitro- now the needle on the fuel gauge doesn't move as fast as the one on the speedo.

  2. #2


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    SR540 do you have any pictures of the main nozzles? where do they go on the carb?

  3. #3


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    JohnnyG383: If you saw my previous reply, please disregard. Go down about 6 threads from mine to: "1997 v-max 500 mid range rough, using lots of gas". Go to page 4, then down 4/5 threads. You will see 2 from 74Nitro. They should contain answers to your questions. Good luck.

  4. #4


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    Where did you happen to find nozzles?

  5. #5
    Senior Member Stock
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    Feb 2020
    Location
    Dublin, On
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    For owners of these sleds with the 5/600 twin engines, it is also important to inspect the oil pump drive shaft every few thousand kms. It is the flat 'male' bar attached to the pump that inserts into the female slot in the end of the pulley shaft. Make sure it is not worn too much and put grease on it, or some choose to clean everything up and put some RTV silicone on it and let it dry.

  6. #6
    Senior Member Improved
    Join Date
    Nov 2011
    Location
    Yellowknife, NWT
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    What happens if the oil pump drive shaft is not lubricated?
    1977, 79, 81 Yamaha SRX
    1979 Skidoo Blizzard Cross Country
    1981 Yamaha SS440(s)
    1981 John Deere Spitfire
    1989 Yamaha ET400TRN
    <90 Phazers
    1991 Yamaha Phazer ST
    1991 Yamaha Phazer 144 Rev (piped)
    1992 Yamaha Ventures XL + TF
    1994 VMax 600
    1999 VMax 600SX redhead
    1999 Venture 700 triple

  7. #7


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    I think I am having the same problem with my 600 twin. Where did you happen to find the nozzles? I haven't been able to find any, looks like they are discontinued.

  8. #8
    Senior Member Stock
    Join Date
    Feb 2020
    Location
    Dublin, On
    Posts
    182


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    I've seen the male portion wear right off and then the oil pump doesn't drive anymore resulting in an expensive engine failure.

  9. #9
    Senior Member Improved
    Join Date
    Nov 2011
    Location
    Yellowknife, NWT
    Posts
    283


    Default

    I have the opposite problem. The thing drinks two stroke oil. Different pump failure I guess
    1977, 79, 81 Yamaha SRX
    1979 Skidoo Blizzard Cross Country
    1981 Yamaha SS440(s)
    1981 John Deere Spitfire
    1989 Yamaha ET400TRN
    <90 Phazers
    1991 Yamaha Phazer ST
    1991 Yamaha Phazer 144 Rev (piped)
    1992 Yamaha Ventures XL + TF
    1994 VMax 600
    1999 VMax 600SX redhead
    1999 Venture 700 triple

  10. #10


    Default

    Quote Originally Posted by ironman_gq View Post
    Where did you happen to find nozzles?
    I happen to call a yamaha dealer in Baxter.mn who had no nozzles, but had a list of dealers who did have them. He steered me to a dealer in South Dakota and one in Toronto.

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