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  1. #1
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    Yamaha V6 200hp gear ratio ? max rpm ?

    Hi S&F !


    I'm trying to set up my boat and engine... and it seems I lack some basic specs of my engine. I'm running a stock Yamaha V6 200hp. Carbed engine. I think 90's.
    Mod nr: 200CETO ; Serial nr: 61HL300746
    Standard 20" midsection and gearcase with the normal waterintakes at the side.


    1/ I'm looking for the gear ratio. If not available on paper, what is the best way to measure this ? manually turn the flywheel ?


    2/ I allready got the engine upto 6000rpm. But what is the rpm of max power ? I don't want to overrev... Also, is there a ignition cut off on these engines ?

    Thanks!
    T.
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  2. #2
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    There is a 6100 rpm limiter and the gear ratio is 1.86/1.
    Ray Neudecker Over The Hill Gang Outboard Racing

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    Thanks Ray !

  4. #4
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    Hello !

    - what is my engine weight ? (factory spec)
    - what happens when you hit the rpm limiter : engine shut down ?

    Thanks,
    T.

  5. #5
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    410 lbs. Unlike a Mercury, that includes the gear case. When you hit the limiter it will misfire one cylinder at a time.You want even feel the miss.
    Ray Neudecker Over The Hill Gang Outboard Racing

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    Thank you for quick reply Ray !

    my carbed V6 Yamaha 200hp : 410lbs=186kg
    V6 Mercury Optimax 200hp : 497lbs=225kg (20" shaft ?, without gearcase you say ?,...)
    V6 Evinrude E-tec 200hp : 418lbs=190kg
    I've always thought my old Yammie to weigh a bit more, but it turns out very OK.

    Don't know the weight of the Merc and rude 200 cowls, but mine is veeeerrry heavy when I compare it to my rude V4 140 cowl. Don't know if my Yammie cowl is original with this engine. It fits perfectly on the part around the shaft, but it states "PRO-V". Is this a PRO-V engine in your opinion ??

    thx, T.


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  7. #7
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    The difference between the Pro V 200 and standard 200 is the ProV 200 has a horizantal front half as well as the cowling.
    That is a very heavy cowling.
    Ray Neudecker Over The Hill Gang Outboard Racing

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    Sorry to bather you again Ray, but you'r the man to talk to :

    A very heavy cowling indeed.
    But I don't understand : "the ProV200 has a horizontal front half as well as the cowling" ?

    So the standard 200 and the 200 PRO-V are technically identical ?
    Can you see this on my serial number what engine I have : PRO-V or the standard ?

  9. #9
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    Quote Originally Posted by Toffy View Post
    But I don't understand : "the ProV200 has a horizontal front half as well as the cowling" ?

    So the standard 200 and the 200 PRO-V are technically identical ?
    No, they are not identical.

    The front half of the block of the Pro-V 200 takes horizontal reed blocks.

    The front half of the block of the regular 200 takes vertical reed blocks.

    Horizontal reed blocks allow greater air flow.

    There are some other differences as well.
    Markus' Performance Boating Links:
    www.toastedmarshmallow.com/performance

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    Hi guys,

    I"m looking for rpm facts again
    What's the full throttle rpm range ? and what's the max power rpm in this range ?

    Friend of mine says it's 4500-5500 with max @5000rpm... but this seems fairly low...
    Hoping to do some proptesting this summer and I expect to replace my 25p prop with a 26p.


    Thx, T.

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    Hello,

    My friend mailed me this link.
    http://www.yamahamarineservice.com/P...n_l200aetx.htm

    So I need to prop according to 5000rpm as the 200 horses are unleashed at this rpm ? Or can I safely go for 5500rpm ?
    Fairly important as I'm turning 5900-6000rpm and I don't want to mess up my engine...

    Thx, T.

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    Closer to 6000, the better. RPM limiter is at 6100.
    Ray Neudecker Over The Hill Gang Outboard Racing

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    As Ray says, prop it to 6000. At 5000 rpm WOT, the wrist pins will eat into the pistons.

    The 200 hp at 5000 rpm is probably just a way of letting the engine make more than 200 hp higher up while still claiming to be a 200 hp engine.
    Markus' Performance Boating Links:
    www.toastedmarshmallow.com/performance

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    Quote Originally Posted by Markus View Post
    As Ray says, prop it to 6000. At 5000 rpm WOT, the wrist pins will eat into the pistons.

    The 200 hp at 5000 rpm is probably just a way of letting the engine make more than 200 hp higher up while still claiming to be a 200 hp engine.
    Thanks for those replies guys !

    So it's safer to run full load at 6000 in stead of 5000 to avoid excessive wear on the piston wrist pins ?
    What hp does this engine make at 6000rpm then ? 220hp ? Seems likely : I always felt this is a light strong running engine

    Just to be sure : are these propshaft horses ? did Yamaha always rate horsepower at the propshaft ?
    By wich I want to ask if there could be a difference in actual hp between my older Yam and the recent Yam of my friend ?

    T.

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    My Dutch friends beg to differ about the rpm to prop this engine to...

    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.

    my S&F friends say : do prop it to 6000rpm to avoid excessive wear on the piston wrist pins...




    2 clearly different opinions from 2 well-respected boating enthousiast groups of people.
    Now, as I want to make sure I'm not messin' up my engine, I'd like to discuss this further.
    I just want to learn by looking at the facts here.

    What I would like to know is :
    1/ how does the limitter work exactly ? How quick does the 6100rpm limitter kick in if you are airborne, and therefore is it safe to run your engine so close to the limitter ? Is this realistic you will reach 7000rpm and have a blow-up ? And as a result : how carefull should you as a throttleman be not to overrev the engine ?
    2/ is it true that you need quite often a rebuilt when turning 6000rpm with this engine ? If your intent is to run your stock Yam engine safe without frequently rebuilts and wear, to what rpm should you prop ?


    Thanks for sharing your constructive thoughts,
    T.

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