60HP Yamaha 2 stroke modifications

Discussion in 'Outboard Maintenance' started by kingofsea, Mar 27, 2017.

  1. kingofsea

    kingofsea Active Member

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    Has anyone out there done any work/modifications on a 60HP 2 stroke Yamaha(2004)? I found a website out there called Hydrotec Marine Performance that sells big carbs, Exhaust tuner, fuel jets, and all gaskets needed to take your 60HP to around 80HP.

    Anyone ever done this? Just wondering?
     
  2. firecat1981

    firecat1981 BBA Counselor

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    The general consensus over the years here have been don't do it. Adding more power then what they were designed for with lead to you buying a new motor a lot sooner.
     

  3. kingofsea

    kingofsea Active Member

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    Got it. Thanks for the heads up.. I always wondered about it, and if it would even be worth it.
     
  4. firecat1981

    firecat1981 BBA Counselor

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    Only you can decide that. I'll just say this, there might be a reason the 70hp is a seperated class.
     
  5. kingofsea

    kingofsea Active Member

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    Thanks for your help! Would rather have the relaibility than speed.
     
    firecat1981 likes this.
  6. No Bait / Lures Only

    No Bait / Lures Only I Love microskiff.com!

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    Yes I currently have 2 motors modified with Hydrotec parts, built 90>115 1987 on Hoog 16'8" and still in service, built 25>35 2006 currently on 17'6" Spear Glade X, run it 3-4 days per week. No issues at all with longevity or reliability. In addition the modded motors burn less fuel as the cruise speed is substantially higher than stock. Only downside is they require premium fuel vs regular for top performance. In addition I have a 18' Shipoke with a lightly modded Mercury 2.5 EFI 150 exhaust tuner, solid mounts, carbon fiber reeds. Runs great no premium fuel as no head modifications. All my motors are modded and no issues....
     
    Last edited: Mar 30, 2017
  7. RunningOnEmpty

    RunningOnEmpty I Love microskiff.com!

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    I did a hydro tec style modded yamaha. It was a fun project and fast. Probably won't do it again though. Buying a bigger motor is so much easier!
     
  8. No Bait / Lures Only

    No Bait / Lures Only I Love microskiff.com!

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    You sounded disappointed, what motor did you modify?
     
  9. KnotHome

    KnotHome "I got to stop wishin'. I've got to go fishin

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    The only difference in the 60 and 70 are the carbs. Wouldn't hurt to change those.
     
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  10. No Bait / Lures Only

    No Bait / Lures Only I Love microskiff.com!

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    Hydrotec modifies the bore of the carbs and the jets, not just a stock carb. Since 1990 I have had good experiences with their products. Company was Yamaha Rebuild/Warranty Center, and so lots of experience with stock and racing motors as well.
     
  11. kingofsea

    kingofsea Active Member

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    Thanks guys!! really appreciate all the input!
     
  12. RunningOnEmpty

    RunningOnEmpty I Love microskiff.com!

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    I wasn't disappointed at all. I had the 3 cylinder 30hp and it was almost as fast as the yamaha 50hp that replaced it. I will say that the 50hp had a much better gear case and the prop shaft size difference is huge. The little 30hp has a wimpy lower that's very fragile with a modded motor. The 50hp also gave me confidence to explore because it was stock and it turned less rpm's.
     
  13. No Bait / Lures Only

    No Bait / Lures Only I Love microskiff.com!

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    Still have the 50? If so you left it stock? Only drawback to the 25/30 lower unit is the delicate prop shaft, had to have mine straightened........cypress stumps are tougher.....
     
  14. RunningOnEmpty

    RunningOnEmpty I Love microskiff.com!

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    I straightened my 30 shaft 2 times. I kept the 50hp factory and only ran it a few times before selling it to a fellow forum member. Now I'm running a yamaha 200 hpdi while searching for a 250 or 300.
     
  15. nativejax

    nativejax Well-Known Member

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    If you were going to mod a yamaha with anything, the hydrotech boys are the ones to use. Lots of guys in the bass world use them and I dont recall them having any more issues than what just normally can occur with a stock motor.
     
    No Bait / Lures Only likes this.
  16. No Bait / Lures Only

    No Bait / Lures Only I Love microskiff.com!

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    Surly you are looking for a 2 stroke ? Rightttttt
     
  17. RunningOnEmpty

    RunningOnEmpty I Love microskiff.com!

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    I think I'm gonna stick with another yamaha hpdi vmax or a mercury optimax xs. I still love my 2 strokes.
     
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