21 Seacraft repower advice?

[Bushwacker]

FYI - they reduced weight while increasing displacement on those newer 4-strokes by eliminating the cast iron cylinder liners! That means they're a throw-away motor if you ever encounter a fuel starvation situation that leans out a cylinder and scuffs a piston! Might be worth checking out a "225" G1 E-TEC that's 240 hp at the prop with even less weight. Consider the HO model if looking for top end power or the standard model if you want the most mid-range torque.

[DonV]

Ditto!!!! Denny speaks the truth! The 225 eTec will run circles around a Yamaha.

Yamaha is very, very proud of their product! Their over priced $$$$ issues is killing them with the re-power group, which they could care less about. Notice the Suzuki following is growing like crazy. Keep in mind Yamaha's main focus is the new boat manufacturers, us little re-power folks are just bottom feeders that provide little profit or revenue.

I know that's a little rough....but it's fact.

[gofastsandman]

Originally Posted by DonV

Ditto!!!! Denny speaks the truth! The 225 eTec will run circles around a Yamaha.

Yamaha is very, very proud of their product! Their over priced $$$$ issues is killing them with the re-power group, which they could care less about. Notice the Suzuki following is growing like crazy. Keep in mind Yamaha's main focus is the new boat manufacturers, us little re-power folks are just bottom feeders that provide little profit or revenue.

I know that's a little rough....but it's fact.

The pink pantie dropper is correct. yammi bought every transom they could. They also
bought many brands. Many.

My `89 20 is factory rated for 235. Orig. data plate.
Go to a trophy shop and get a new one made.
My original transom is 2 3/8 at 25".

My brother just put an 08 etec 225 on his Mako 221 at 2600lbs and is very happy.
Replaced yami ox 66 250.

Torque baby.

Slacker out

[kmoose]

Originally Posted by Bushwacker

FYI - they reduced weight while increasing displacement on those newer 4-strokes by eliminating the cast iron cylinder liners! That means they're a throw-away motor if you ever encounter a fuel starvation situation that leans out a cylinder and scuffs a piston!

If it was a 2 stroke that would be more of an issue but internal piston oiling on a 4 stroke pretty much eliminates that issue as many car motors for decades turn fuel and spark off to cylinders to improve fuel economy. It's not an issue and it wouldn't surprise me if Evinrude makes a move in the same direction to reduce weight down the road.

Chip, Yamaha makes great motors that are inherently reliable but at a high price tag. I wouldn't hesitate a bit if you want to go with the Yamaha as plasma coated, non-iron cylinder linings are not some brand new technology that came out yesterday and have also not been problematic with engine manufactures that use them to lighten all kinds of motors including Yamaha.

I find it quite amusing to see the level of Yamahatred on all the boards but for the most part it is non-Yamaha owners that raise the most concerns. I'm quite surprised GFS hasn't started with the F350 flywheel rant yet.

[Terry England]

Originally Posted by kmoose

I find it quite amusing to see the level of Yamahatred....... I'm quite surprised GFS hasn't started with the F350 flywheel rant yet.

Hold on Big guy - GFS and I are not done with -
Elgin water pump driven bilge pumps,
Eska shear pins
Sea King motor mounts
Martin throttle grips
Homelight Bearcat prop selections
Keikhaefer Hurricane coils

So hold your horses, we'll get to those saber toothed frisbees soon.

[Snookerd]

No reason to NOT fan the flames of a good ole fashion THT style thread! Keep it rolling.....this should help....the Potter 23 is a poor knock-off of the true 21 by Carl! Talk amongst yourselves!

[Terry England]

Originally Posted by Snookerd

No reason to NOT fan the flames of a good ole fashion THT style thread! Keep it rolling.....this should help....the Potter 23 is a poor knock-off of the true 21 by Carl! Talk amongst yourselves!

What!! Now you show up with the C-4? You'er supposed to be down at the bottom monitoring the Gatherings!!
Up here we have to carefully balance being thin skinned, hard headed and have a lack of direction. It's like juggling!
Just sharpen up your Scallop spoon and get ready for the 16th, Zig-Zag's has French fries better than "5 Guys" and the CSC big guns (well, less Kmoose) will be "delivering the goods", so don't be late pull'in out of Sarasota, Bro'

Besides, I've been thrown out of better places than "Capt. Chucks". He'd throw me out except he wants to collect my bar tab!

[gofastsandman]

Originally Posted by kmoose

If it was a 2 stroke that would be more of an issue but internal piston oiling on a 4 stroke pretty much eliminates that issue as many car motors for decades turn fuel and spark off to cylinders to improve fuel economy. It's not an issue and it wouldn't surprise me if Evinrude makes a move in the same direction to reduce weight down the road.

Chip, Yamaha makes great motors that are inherently reliable but at a high price tag. I wouldn't hesitate a bit if you want to go with the Yamaha as plasma coated, non-iron cylinder linings are not some brand new technology that came out yesterday and have also not been problematic with engine manufactures that use them to lighten all kinds of motors including Yamaha.

I find it quite amusing to see the level of Yamahatred on all the boards but for the most part it is non-Yamaha owners that raise the most concerns. I'm quite surprised GFS hasn't started with the F350 flywheel rant yet.

I will run old school omc smokers until they legislate me out of existence.
I can fix em with a hammer and a feeler gauge...

The 8 6 4 gm engine was a wonker if there ever was one.
We owe much to NASA and Mobil 1.

[Bushwacker]

Originally Posted by kmoose

. . . If it was a 2 stroke that would be more of an issue but internal piston oiling on a 4 stroke pretty much eliminates that issue as many car motors for decades turn fuel and spark off to cylinders to improve fuel economy. It's not an issue and it wouldn't surprise me if Evinrude makes a move in the same direction to reduce weight down the road. . .

With regard to the fuel starvation/lean combustion/overheated piston issue, the 4-stroke motors do have one advantage, i.e., the wasted exhaust/intake stroke reduces the time that the piston is exposed to extremely high combustion temps by 50%, which would reduce the tendency of the piston to overheat/expand and seize in the bore. However the other problem that occurs with very lean combustion is detonation, and both 2 and 4 cycle motors are equally at risk for this destructive phenomenon, which can quickly fail rings, ring lands, or even blow holes in the piston, either of which can score the cylinder walls. Oil cooling of the pistons does not necessarily help reduce small local hot spots or glowing carbon deposits on the piston surface which can trigger detonation. Although you MIGHT be able to hear the valves rattling caused by detonation on a 4-stroke, there is no such warning on a 2-stroke, so BRP has installed knock sensors on the 3.3/3.4L G1 E-TECs and all the G2 models. If the EMM detects knock, it will enrich the fuel mixture and retard spark, but if that isn't effective, it will put the motor into safe mode and display a "knock detected" warning on the digital gauge. They've also used a higher strength/higher temperature NASA aluminum alloy for the pistons on all E-TECs to provide additional margin against these sort of problems.