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  1. #16
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    Quote Originally Posted by Toffy View Post
    my dutch friends say : don't prop to 6000rpm, be aware your engine will need a rebuilt after every race. If your engine is doing 6000rpm and your boat and prop go airborne you are overrevvin' the engine. when you reach 7000rpm you have the real possibility of a blow up.

    Find some new friends!

  2. #17
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    Quote Originally Posted by 6Killer View Post
    Find some new friends!
    yeah, yeah, yeah... I saw that reply comming
    Add some facts please, as only those will be convincing

  3. #18
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    I have been modifying Yamaha motors for 25 years now. There are a few that are still running with out being rebuilt for that long. They have been propped to turn 6000 or so. Some have had the limiter removed and been propped to turn 6400-6800 on those good days when light.
    The limiter kicks in instantly when hooked up. In drag race form, turning 9000 or so is not unusual.
    I don't know your Dutch friends, but I personally belive they are full of s**t and don't have a clue what they are talking about.
    Belive what you want and who you want, but you have become insulting and demanding of people who do know and have tried to tell you what their experience relates. They are under no obligation to try to answer your questions.
    Ray Neudecker Over The Hill Gang Outboard Racing

  4. #19
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    Quote Originally Posted by Ray Neudecker View Post
    but you have become insulting and demanding of people who do know
    Ray, that was absolutely NOT my intent ! I tried to explain the situation I'm in here. Thanks for your answers, usefull and to the point as always

  5. #20
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    Quote Originally Posted by Ray Neudecker View Post
    Belive what you want and who you want, but you have become insulting and demanding of people who do know and have tried to tell you what their experience relates. They are under no obligation to try to answer your questions.
    Have another cup of coffee Ray.................lol


    Toffy, "Let it Eat!"
    Last edited by 6Killer; 05-10-2013 at 11:12 AM.

  6. #21
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    Quote Originally Posted by 6Killer View Post
    Toffy, "Let it Eat!"
    OK, you made your point guys... As I'm turning 6000rpm it only eats fuel and not the pistons by the wrist pins

  7. #22
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    Quote Originally Posted by Toffy View Post
    2/ is it true that you need quite often a rebuilt when turning 6000rpm with this engine ?
    No. Prop it to 5800+ to make it live as long as possible between rebuilds.
    Markus' Performance Boating Links:
    www.toastedmarshmallow.com/performance

  8. #23
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    Quote Originally Posted by Ray Neudecker View Post
    I have been modifying Yamaha motors for 25 years now. There are a few that are still running with out being rebuilt for that long. They have been propped to turn 6000 or so. Some have had the limiter removed and been propped to turn 6400-6800 on those good days when light.
    The limiter kicks in instantly when hooked up. In drag race form, turning 9000 or so is not unusual.
    I don't know your Dutch friends, but I personally belive they are full of s**t and don't have a clue what they are talking about.
    Belive what you want and who you want, but you have become insulting and demanding of people who do know and have tried to tell you what their experience relates. They are under no obligation to try to answer your questions.
    i run my excel on the limiter my buddy with the same motor spun his 7000 rpm and it stayed together so far he bought it used a year ago.. the yammis are strong motors and can take a beating for decades.. great motors

  9. #24
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    I found some more info on the riscs of overpropping your engine... seems to be worse compared to underpropping as there is no warning.
    full load at too low rpm leads to detonation.
    http://2strokeonly.com/Propellers.html (at the bottom "RPM vs PITCH")

  10. #25
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    Drive the sh*t out of it I turned mine to 7000 too often and never was easy on it and it stayed together for five years of my foot not to mention it was used and on a hydrostream when I got it. So no tellin how it was treated prior to me getting it. And I ran Walmart oil mixed 50to1 and regular gas with ethanol

  11. #26
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    Quote Originally Posted by brockshydro View Post
    Drive the sh*t out of it I turned mine to 7000 too often and never was easy on it and it stayed together for five years of my foot not to mention it was used and on a hydrostream when I got it. So no tellin how it was treated prior to me getting it. And I ran Walmart oil mixed 50to1 and regular gas with ethanol
    i need to run 89 octain or higher to stay out of the knock sensor.. it runs like crap on regular..and is noticeably faster on premium..

  12. #27
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    The Excell does require premium fuel to stay off the knock sensor. Otherwise it cuts the timing way back to prevent detonation. Not a knock sensor on the 200 or Pro V 200 since the motor was not designed to need premium to live.
    Ray Neudecker Over The Hill Gang Outboard Racing

  13. #28
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    I have a Yamaha 200 on my Venus. When I prop it to run 6000, it actually runs better at all points throughout the rpm range. If I know I'm going on a long run, where I won't be running WFO for any extended period of time, I will prop it up a little to bring the cruise rpm down. I only do this with a light load. It helps with mileage.

    I agree that loading the engine too much will drive it into detonation. I have a Laser II, 23 pitch that puts mine right at 6000, maybe 6100. The bottom end is great, it pulls skiers like a champ.

    That Yamaha has been such a good runner that I'm thinking of pulling it and selling the boat without a motor. I really want to put it on a deck boat.

    I would listen to the Yamaha guys on here. I have gotten a lot of really good info from them. Do what has worked for people who have "done", not from someone who has "heard".
    The Reverend, (Cedar Machine Service on Facebook)
    1989 HST 2.5 260 Merc Offshore
    1991 Vaserette YT 200 Mercury
    1988 Venus XT 200 Yamaha
    1983 Viper II Merc 90
    1977 Viper
    Mini GT tunnel, 25 Merc
    "African Queen" pontoon 25 Merc
    Aluma fishin tub, 20 motors to choose from!



    GUESS WHAT?...I gotta fever,...and the only prescription...IS MORE COWBELL!!

  14. #29
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  15. #30
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    Quote Originally Posted by rev.ronnie View Post
    I have a Yamaha 200 on my Venus. When I prop it to run 6000, it actually runs better at all points throughout the rpm range. If I know I'm going on a long run, where I won't be running WFO for any extended period of time, I will prop it up a little to bring the cruise rpm down. I only do this with a light load. It helps with mileage.

    I agree that loading the engine too much will drive it into detonation. I have a Laser II, 23 pitch that puts mine right at 6000, maybe 6100. The bottom end is great, it pulls skiers like a champ.

    That Yamaha has been such a good runner that I'm thinking of pulling it and selling the boat without a motor. I really want to put it on a deck boat.

    I would listen to the Yamaha guys on here. I have gotten a lot of really good info from them. Do what has worked for people who have "done", not from someone who has "heard".
    the only thing it needs is more cow bell

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