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Author Topic:   13 REPOWERING 25HP 2STROKE VS 4 STROKE

HIGHLANDER posted 12-15-2000 03:43 PM ET (US)
I HAVE A 1967 13 FOOT AND I AM REPOWERING.MY 2 ENGINE CHOICES ARE MERC 25 HP 2 STROKE AND 25 HP YAM 4 STROKE. THE MERC IS MANUAL NO ALTERNATOR, THE YAM IS ALSO MANUAL BUT HAS AN ALTERNATOR.COST FOR THE YAMAHA IS APPROXIMATELY 400.00 MORE. ANY IDEAS? ALSO HOW FAST WILL THE BOAT BE WITH THESE MOTORS? LAST I HAVE TELEFLEX STEERING ANY ADAPTERS AVAILABLE SO THE CABLE END DOES NOT HIT THE TRANSOM? ANY HELP/IDEAS IS APPRECIATED
Dick posted 12-15-2000 07:04 PM ET (US)
I have a 17 Montauk with a Merc 50 4 stroke and it will run 38 mph. Haven't run a 13 in many years and then didn't have a speedo on it.
Go with the 4 stroke, it's a little heavier and a few bucks more but once you have run one you will never have a 2 stroke again. Smooth, quiet and no oil smell.
Dick
Easy E posted 12-15-2000 11:05 PM ET (US)
A friend of mine has a 13' whaler with a yamaha 30hp it runs at 34mph.The thing with 4 strokes are they aren't as powerfull as a 2 stroke but they are nice 'n' smooth.I myself have a 13' whaler with a 2000 35hp Johnson.It's VERY fuel efficient.I run it with a powertech 15pitch cupped polished stainless steel prop giving me 39-40mph and i get better fuel efficiency than my friends whaler with the 30 yamaha.I would go with the two stroke but it depends on what you want out of your engine and boat.
Well i hope this helps~Whalin 4 life~Easy E~
andygere posted 12-16-2000 11:37 AM ET (US)
The mid 80's merc on my old 13 has not been a reliable motor. In my opinion, it's a piece of junk, and parts availability has always been lousy. My advice is to look at other threads in this section and see what others have said about various brands. I have heard nothing but good reports on Yamahas. There are also some posts discussing Nissan/Tohatsu motors available at really good prices. It will be a consideration for me when/if I repower the 13.
AZdave posted 12-17-2000 09:16 PM ET (US)
I just put a 30hp three cylinder Yamaha on my 1968 13ft Sport. I also added Teleflex steering, and was disappointed that the ram hit the transom. If you call Teleflex, they will direct you to an employee who knows exactly how to fix this problem with this boat. You need to mount a sort of ball and socket stand-off on the transom. You may need a cable that is one size shorter. It will be worth it!
kevin posted 12-18-2000 08:22 PM ET (US)
we repowered our 1971 13' sourpuss this past summer (another note by me explains how NOT to do it).
anyways, we're now very happy with a yamaha 4-stroke 25 with elec start. for what we use this boat for (puttering around on an inland lake) the motor is wonderful. it only goes about 27mph. i've never played with props and we keep the trim way down to prevent porpoising, but i bet 30mph is about the max.
but the motor is so quiet at trolling speeds with no smoke or odor, and no premix. for our needs this wins over better top speed and less weight that the 2c would offer.
the mechanical steering setup was no problem, used a clamp block (p275 in west marine catalog) altho this is a source of some vibration.
i do think the yamaha vibrates more than the old '79 johnson 35 it replaced. or maybe the yamaha is just quieter so now we notice the dancing rod holders...

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Author	Topic: 13 REPOWERING 25HP 2STROKE VS 4 STROKE
HIGHLANDER	posted 12-15-2000 03:43 PM ET (US) I HAVE A 1967 13 FOOT AND I AM REPOWERING.MY 2 ENGINE CHOICES ARE MERC 25 HP 2 STROKE AND 25 HP YAM 4 STROKE. THE MERC IS MANUAL NO ALTERNATOR, THE YAM IS ALSO MANUAL BUT HAS AN ALTERNATOR.COST FOR THE YAMAHA IS APPROXIMATELY 400.00 MORE. ANY IDEAS? ALSO HOW FAST WILL THE BOAT BE WITH THESE MOTORS? LAST I HAVE TELEFLEX STEERING ANY ADAPTERS AVAILABLE SO THE CABLE END DOES NOT HIT THE TRANSOM? ANY HELP/IDEAS IS APPRECIATED
Dick	posted 12-15-2000 07:04 PM ET (US) I have a 17 Montauk with a Merc 50 4 stroke and it will run 38 mph. Haven't run a 13 in many years and then didn't have a speedo on it. Go with the 4 stroke, it's a little heavier and a few bucks more but once you have run one you will never have a 2 stroke again. Smooth, quiet and no oil smell. Dick
Easy E	posted 12-15-2000 11:05 PM ET (US) A friend of mine has a 13' whaler with a yamaha 30hp it runs at 34mph.The thing with 4 strokes are they aren't as powerfull as a 2 stroke but they are nice 'n' smooth.I myself have a 13' whaler with a 2000 35hp Johnson.It's VERY fuel efficient.I run it with a powertech 15pitch cupped polished stainless steel prop giving me 39-40mph and i get better fuel efficiency than my friends whaler with the 30 yamaha.I would go with the two stroke but it depends on what you want out of your engine and boat. Well i hope this helps~Whalin 4 life~Easy E~
andygere	posted 12-16-2000 11:37 AM ET (US) The mid 80's merc on my old 13 has not been a reliable motor. In my opinion, it's a piece of junk, and parts availability has always been lousy. My advice is to look at other threads in this section and see what others have said about various brands. I have heard nothing but good reports on Yamahas. There are also some posts discussing Nissan/Tohatsu motors available at really good prices. It will be a consideration for me when/if I repower the 13.
AZdave	posted 12-17-2000 09:16 PM ET (US) I just put a 30hp three cylinder Yamaha on my 1968 13ft Sport. I also added Teleflex steering, and was disappointed that the ram hit the transom. If you call Teleflex, they will direct you to an employee who knows exactly how to fix this problem with this boat. You need to mount a sort of ball and socket stand-off on the transom. You may need a cable that is one size shorter. It will be worth it!
kevin	posted 12-18-2000 08:22 PM ET (US) we repowered our 1971 13' sourpuss this past summer (another note by me explains how NOT to do it). anyways, we're now very happy with a yamaha 4-stroke 25 with elec start. for what we use this boat for (puttering around on an inland lake) the motor is wonderful. it only goes about 27mph. i've never played with props and we keep the trim way down to prevent porpoising, but i bet 30mph is about the max. but the motor is so quiet at trolling speeds with no smoke or odor, and no premix. for our needs this wins over better top speed and less weight that the 2c would offer. the mechanical steering setup was no problem, used a clamp block (p275 in west marine catalog) altho this is a source of some vibration. i do think the yamaha vibrates more than the old '79 johnson 35 it replaced. or maybe the yamaha is just quieter so now we notice the dancing rod holders...