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Prop Choice
action	#1  Posted on 10/09/17 - 3:23 PM
Member Personal Page Posts: 208 Comments: 2 Joined: 01/03/15	My brother just got a 1996 Montauk with a Yamaha 70HP 4 stroke on it. It looks like it has the stock aluminum 17" pitch prop. What prop do some of the other members like with this combination? It has a top end close to my 1988 Montauk with the ETEC 90 and Viper 15" but does not come up on plane near as fast
Phil T	#2  Posted on 10/10/17 - 6:17 AM
Administrator Personal Page Personal Album Project Albums Posts: 7043 Comments: 6 Joined: 03/26/05	Action - These recommendations came from members with the F70. Note the F70 has a WOT RPM max of 6300. Engine should be mounted two or more holes up. 13 x 16 PowerTech SCD 13.25 x 14 SCP (6100 rpm's, 3 holes up) 13 x 17 Yamaha Painted SS 13.25 x 14 Yamaha Performance Series (polished) 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
JRP	#3  Posted on 10/10/17 - 6:30 AM
Member Posts: 755 Comments: 2 Joined: 08/29/14	action wrote: My brother just got a 1996 Montauk with a Yamaha 70HP 4 stroke on it. It looks like it has the stock aluminum 17" pitch prop. What prop do some of the other members like with this combination? It has a top end close to my 1988 Montauk with the ETEC 90 and Viper 15" but does not come up on plane near as fast A different prop may help, but a 70 HP 4-stroke engine probably won't compare too favorably with a 90 HP 2-stroke for hole shot. If the new prop makes a big improvement, be sure to let us know. It would be very impressive if the Yamaha 70 can close the gap with that ETEC 90. The Yamaha 70 4-stroke is a nice lightweight engine, which may make all the difference.
44thomas44	#4  Posted on 10/10/17 - 7:08 AM
Member Posts: 21 Comments: 0 Joined: 10/20/12	I have a 1970 Katama 17 with powertech 13.25 x 14 on a brand new 70 hp Yamaha 4 stroke . I also have a 1988 Custom 17 with a Yamaha 90 hp 2 stroke . The 70 hp 4s performs almost identically as the 90 hp 2 s. Hole shot very close , but from 5000 to 6100 rpms , the 70 hits a passing gear and really takes off . The only real difference I see between the 2 engines is the 4 stroke gets incredible fuel economy .