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will F70 yamaha push a 1970 16' Katama
1970katamajs	#1  Posted on 04/27/20 - 7:14 AM
Member Posts: 2 Comments: 0 Joined: 04/27/20	I have a 1970 16' Katama...my present engine is a merc 75 four stroke...My engine is going into limp mode and I found that the water yube bushing was pinched and not seated properly. I replaced the water pump and water tube bushing and am hoping that fixes the issue. After all the problems narrowing down the issue I was considering a repower to a Yamaha F70 which is 100 lbs lighter that the Merc 75 four stroke. Does anyone have an F70 Yamaha on a Katama? that can provide performance stats? TIA (changed to proper boat model for clarification) Edited by Joe Kriz on 04/27/20 - 1:02 PM
Phil T	#2  Posted on 04/27/20 - 7:51 AM
Administrator Personal Page Personal Album Project Albums Posts: 7043 Comments: 6 Joined: 03/26/05	Lightly loaded, a Katama with an F70 will reach 35-39 mph at wide-open-throttle (WOT) when rigged and propped correctly. 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
reelescape1	#3  Posted on 04/27/20 - 10:22 AM
Member Personal Page Posts: 68 Comments: 0 Joined: 11/12/05	Good Youtube stuff by 3DSailor you might be interested in seeing. He takes an older 17' Montauk w/70 Yamaha 4S from NW to Key West. Similar set-up I think.
1970KatamaVB	#4  Posted on 05/19/20 - 10:37 AM
Member Posts: 1 Comments: 0 Joined: 05/19/20	We have a 1985 Johnson 60 HP on ours and it will push it quite well. We can even pull freeboarders or tubes, though they can pull the boat a bit Edited by Joe Kriz on 05/19/20 - 11:37 AM
biggiefl	#5  Posted on 05/19/20 - 11:08 AM
Member Posts: 890 Comments: 4 Joined: 05/08/06	FYI...I believe the 1985 60hp 2cyl was the last year of that model and replaced by a 60hp 3cyl in 1986. The 1985 60hp I believe is still powerhead rated hp so in todays engines would be more like a 55hp. I had a 1968 custom with a small gearcase mercury 60hp and yes she was pretty impressive for that small motor. 24 Whalers so far....