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  1. Thread: Tohatsu M50D2

    by fastcatt
    Replies
    9
    Views
    962

    Hi Piston wash indicates the richness/leaness...

    Hi
    Piston wash indicates the richness/leaness of a motor. The more wash (or clear spot on the piston crown) the more rich condition=more fuel. If the pumping action and/or the imbalance of fuel to...
  2. Thread: Tohatsu M50D2

    by fastcatt
    Replies
    9
    Views
    962

    I added a couple boost ports, fixed the transfers...

    I added a couple boost ports, fixed the transfers where they enter the bore and the case where the transfers are fed. The piston wash on this motor (and other Tohatsu triples i've seen) always...
  3. Thread: Tohatsu M50D2

    by fastcatt
    Replies
    9
    Views
    962

    I have been doing some research to try see what I...

    I have been doing some research to try see what I can find but nothing so far that looks like even close to a direct fit. Some of the yamaha RD350/400/Banshee reeds look promising but they do not...
  4. Thread: Tohatsu M50D2

    by fastcatt
    Replies
    9
    Views
    962

    No I am not. Fastcatt is a play on my last name...

    No I am not. Fastcatt is a play on my last name which is pronounced "cheetah". Just a MN guy working on a fishing boat motor...
  5. Thread: Tohatsu M50D2

    by fastcatt
    Replies
    9
    Views
    962

    Tohatsu M50D2

    Hi All,

    Are there any reed blocks that can be swapped into my Tohatsu M50D2? I have a modified the ports, re-angled the squish on the stock head, 70 yamaha carbs, M50D1 tuner. My calculations...
  6. Thread: Nissan NS40D2

    by fastcatt
    Replies
    11
    Views
    3,881

    As far as putting larger than stock carbs,...

    As far as putting larger than stock carbs, cutting heads and port timing changes. I am still trying to retain some tractability with the motor and fuel as it is on a fishing boat. I will probably...
  7. Thread: Nissan NS40D2

    by fastcatt
    Replies
    11
    Views
    3,881

    Is the 50D1 tuner enough of an improvement that...

    Is the 50D1 tuner enough of an improvement that it is worth taking the powerhead off to install?

    Thanks,

    Mark
  8. Thread: Nissan NS40D2

    by fastcatt
    Replies
    11
    Views
    3,881

    Hi all The 40 carbs are smaller than the 50...

    Hi all

    The 40 carbs are smaller than the 50 carbs. The 40 carbs were only opening up 2/3 from the factory.

    I think I am going to go with Boyesen Reeds and remover the stops.

    Did the...
  9. Thread: Nissan NS40D2

    by fastcatt
    Replies
    11
    Views
    3,881

    thanks for the replys Are the reed stops which...

    thanks for the replys

    Are the reed stops which are set at about .250 on the 40hp vs .360 on the 50hp hurting top end power? I am probably getting more flow thru the carbs with them opening more. ...
  10. Thread: Nissan NS40D2

    by fastcatt
    Replies
    11
    Views
    3,881

    Nissan NS40D2

    Hi all,

    New to the site, love the info I have found so far.

    I have a Nissan(tohatsu) NS40D2 tiller on a 16 foot shallow v aluminum boat. It probably weighs 400-450lbs. the cavitation plate is...
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