Opinion: Repowering '75 170 with Suzuki 60hp?

[flyboyo2]

Thanks for your input and I see your point.  I have a 32 gal fuel tank plus the engine and pax plus gear and we are indeed pushing 2000lbs. 
I was hoping that someone had hung a 60 on a 170 or 175 in order to see the results.  Decent mid range two strokes are impossible to find and you really don't know what you'r getting.  My 89 Mariner 75 runs and I get 23mph at 3800 rpm which is a high as I will push it.  However, after every outing I have to repair something and now my lower unit is suspect.  I'm in a quandry as I don't use it enough for a major outlay of funds.

[Jimmies]

Man I got the motor on my boat and almost forgot about you guys over here. At some point I'll try to get some photos up so you can see how it sits in the water relative to the scuppers. For me, weight was my main concern, not speed. So I did opt for the 60 Suzuki 4 stroke. At 6,000 RPM with a light load I am getting 24 knots. The sweet spot for my rig seems to be around 5,100 rpm / 20 knots. This is about what I expected out of the motor and I'm happy with my choice so far. I should add that fuel consumption is noticeably better than my old 70 Nissan 2-stroke.

[Levi]

If you're able to turn 6k I might would go up a pitch on the prop and gain a couple mph on the top and have a lower cruising rpm  also 5100 is pretty high for a cruise rpm and the Suzuki's gear ratio has the grunt to turn a bigger pitch with less effect on the rpm

[JimInPB]

  I have a 32 gal fuel tank plus the engine and pax plus gear and we are indeed pushing 2000lbs. 
I was hoping that someone had hung a 60 on a 170 or 175 in order to see the results. 

I put a 60 on a brand new 170 back around 1984.  I would not go ANY smaller.  The 60 was just enough to get the boat up on plane with 2 people & minimum gear in semi-friendly sea conditions.  An older boat that is a bit water logged & a bit heavier may have trouble getting up with a 60.

You have a 32 gal tank?  I thought that the originals were like 27 or 28.  I'd love to get an extra 5 gallons into mine.  Where did you get that tank?

[boatnamesue]

  I have a 32 gal fuel tank plus the engine and pax plus gear and we are indeed pushing 2000lbs. 
I was hoping that someone had hung a 60 on a 170 or 175 in order to see the results. 

I put a 60 on a brand new 170 back around 1984.  I would not go ANY smaller.  The 60 was just enough to get the boat up on plane with 2 people & minimum gear in semi-friendly sea conditions.  An older boat that is a bit water logged & a bit heavier may have trouble getting up with a 60.

You have a 32 gal tank?  I thought that the originals were like 27 or 28.  I'd love to get an extra 5 gallons into mine.  Where did you get that tank?

The member who started this thread already bought and installed a 60hp zuki, Fyi.  This thread ended a few months ago.

[deepdropper]

A 60hp would be to small for my 222. with my 175 i cruise at 3100-3500 and that gives me 22-24 knots which seems to be a good speed for these boats. Since a lot of the original 222 can with twin 70hp I figure I would put a single 140.

To me it sounds like your 60 is working to hard. Your RPMs should be around 4500.

John