90 HP 4- Stroke Johnson with EFI or 4- Stroke Yamaha with carbs? - The Hull Truth

Lady Jayne · 10-06-2003, 08:23 AM

It has now come down to this. What would you do between these 2 motors? Don't forget the John is a Suzuki.

marti · 10-06-2003, 08:36 AM

Well oracoke, I have had 2 4/str carb engines, yam and merc, and now a efi 115/4 merc.
The difference in starting is amazing one click and the efi goes without pumping the primer ball and shoking??.
That is the main advantage I can think of, but if I'm right the john/suzi has a oil bath chain thing??? that need no adjustments, and no rubber belt.
Well some body will say some more technical things but I will go for the EFI.

greetings from holland
marti

cgrand · 10-06-2003, 10:00 PM

i have the F100 (carb'd) which was detuned for the F90- it runs smoothly, quietly, and faithfully

in three years only regular maintenance (oil/filter/lower unit/water pump)

i have no idea how or why it works, only that it does

"support THT- join the captain's club!"

warthog5 · 10-09-2003, 10:57 AM

I would pick the John/Suzuki. These motors have a timing chain that runs in the oil bath and have a higher alt. output. It swings a bigger prop too.

The Yamaha has a timing belt that is not a freewheel motor. What that means is if the timing belt breaks or strips some cogs off the belt, the pistons will colide with the valves.

http:www.classicmako.com

fishingdude · 10-09-2003, 11:11 AM

Would not the same thing happen with the chain too?

warthog5 · 10-10-2003, 08:22 AM

Timing chain's don't break. At least in my 30+ years of auto experiance. The timing gears can wear out, especially if they have a nylon coating over the teeth. They can strech. I pretty sure that the Suzuki has a idler on the chain to take up any strech.
Timing belts by their nature can rot. My brother had one on his old truck [2.0L Ranger] That I was able to grab with both hands and tear it in half. It had 80K miles on it.

http:www.classicmako.com