wizzard0
27.04.2021 0:56:52
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scrap the compression test on that engine, its useless.
use a leak down test.
if well maintained, more importantly kept correctly propped for the load, and run hard, your not really quite broke in.
run ring free, have a true decarb with the yamaha injector system, not just a spray can, once a year and maintain the cooling system. keep the incoming fuel clean with at least a 10 micron filter, try to run it above 4000 RPM and 3500 hours is fairly normal, 5000 hours I see occasionally.
usually something external to the motor kills it long before it wears out.
I have seen a few that the rings rotated and the gaps lined up.
so far no cure for that.
[links]
Five years ago Mercury rolled out a new 2.1-liter outboards in 75, 90, and 115 HP ratings with engines that have close to the most displacement in their class while keeping weight at the lowest end of the class. At 359 pounds, in fact, it under-cuts the older 1.7-liter Mercury offerings by 40 pounds. Our Outboard Expert Charles Pluddeman described these engines as running “sewing-machine smooth,” and according to Mercury, an amazing 17,000 testing hours went into developing these outboards.
Enter the new 2021 Verado 600 horsepower V12 outboard engine that delivers simply some of the most extraordinary performance numbers in the history of outboard engine manufacturing - along with many new innovations and game-changing technologies. Advancements in handling and control are made possible by the outboard segment’s first steerable-gearcase and an industry-first two-speed transmission. more
You want neck-snapping acceleration and Yamaha-style power? The V-Max SHO 115 will do the trick. more
The builder is now taking orders for rounds two and three, likely to be delivered in 2022, while the first round are slated to be delivered before the end of 2021. These remarkable 330-pound outboard motors work in tandem with the company's 160-watt-hours per kg batteries. Evoy says the motor is best suited for boats 18-25 feet long for single installments, and 25-35 feet long for dual outboards. The plan is to start with the 150, and develop the product line rapidly from there, releasing a 300 HP outboard next, followed by a 450 HP flagship outboard eventually. That is something we look forward to seeing!
david girard (Tuesday, 01 September 2020 14:44) [links]
Marek (Tuesday, 30 March 2021 10:41) here
Peter Hristov (Friday, 06 March 2020 09:42) [links]
Yamaha 25J/ 25X/ 30D/ 30X Service Manual [en].pdf
Yamaha 250B/ L250B Service Manual [en].pdf