I wasn't aware that any of the triple cylinder 25's had oil injection. 40's yes (P40 and some of the 40's but never the C40, IIRC) but I don't remember the 25 having it. Twin cylinder twin carb up to 2001 I think, yes but later no.
Yamaha was 100:1 up to 40hp, up until 2009 when the 25 2 stroke was discontinued. They will run forever at 100:1 as long as the oil is good quality Yamalube or equivalent.
The triple 25 can make up to about 80 hp give or take, depending on how far you want to go with it. They are mod-friendly but the more you do, the less reliable they get. Experience speaking. Had one, it was fast and fun but I worked on it as much as I got to use it. Change jetting with big weather swings among other things.
The stock motors, un-modded, can bring a lot of money to the right person. WAY more than any other Yamaha 25. I saw one recently...clean, bone stock, sat more than it got used...sold for $3100. Motor alone, no boat.
I think some of the 30hp and I know for sure some of the 40's had Autolube. In this area, many of the 30's and 40's were used as "25hp" by changing the cowling, from the 30 or 40hp cowling to the 25 3 cylinder cowling. Lot of the public duck hunting areas are 25hp max. Game commission got smart and started checking the serial numbers. 6H4 serial prefix was 40hp. And a lot of them had the actual model number on the tag (e.g. 30ETLJ which would be a 30hp). The triple 25, the 30, and some of the 40's were the same block, same foot, same mid section..different carbs, ignition, reeds, and tuner, among other smaller differences. Actually thats why they're worth more in this area. The duck hunters (boat racers) love the 3 cylinder model. Have spoken to many who have driven a thousand miles (literally) to buy them from east coastal areas, even some going to Minnesota, Wisconsin and one went clear to Idaho to buy one. They're crazy about them out here. Duck hunting...in this area...is a rich man's sport anyway and the spoiled rich kids drive for days, buy the motor they wanted, bring it back and the first time out in the flooded timber, run over every log, stump, tree, booskios, run it aground, and just destroy it. All this while trying to be the first one to the "hole", hence the mods.
Another good one is the Suzuki DT25, once you get past the short tiller.
Just amazes me that people will get crazy over those two motors, even the manual start models. Guess I am spoiled now with electric start. The Yamaha 3 clyinder was only made a few years (97-02 I think) and they were all manual start. Electric not offered to my knowlege, so if you find an electric start 25 3 cylinder, it's probably either been converted or it is a 30 or 40 with a 25 cowling.
