saullysaul78
17.06.2021 5:17:25
1) What Racingfrank7 says is true: same air intake, same jet, more oil, less petrol, mixture leaner than designed.
See full version: Yamaha outboard oil mix
1) What Racingfrank7 says is true: same air intake, same jet, more oil, less petrol, mixture leaner than designed.
It seems to be asking for trouble, it will lead to oiling of the plugs, huge amounts of smoke and a virtual oil slick behond you. more
When I bought mine, dealer said run it permanently on 50:1, even though book says 100:1. more
Although recreational engines may have used 100:1, 50:1 was usually recommended for commercial use.
The jet being a fixed size, will allow set amount of fluid through. If you mix oil into the petrol then the % of petrol in that fluid is reduced from 100% to 97% ish on a 30:1 mix. (30 parts petrol to 1 of oil) So less fuel in, hence a leaner mixture. Having said that if you increase the jet size by 3% to compensate that takes a 270 main jet up to 280 to the nearest jet size [links]
If you do run on 100:1 add a bit more oil to the last tankful before laying up, or "fog" the engine immediately before storage.
I followed the instructions in the owner's manual to the letter for initial break in. I have never been happy with the motor - particularly the cold starting. When I had about 20 hours on it I posted a question on the Yamaha forum about it and nobody could help me in that regard. But in the process of talking about it the Yami guru over there said I'd be stupid to run 100:1, because the motor will eventually fail. So, based on that advise I switched to 50:1. I troll too and that little SOB just smoked too much so I compromised and switched to 75:1. Still smoked too much to suit me.
I figure while anyone reads this i can add there is a little bit of surface rust on some of the bolts on the powerhead.What is the best chemical i can use to get all that surface rust off the bolts witout hurting aluminum as it is being a pain in the butt to get off?
Re: 100:1 or 50:1 with a 2006 yamaha 25hp 2stroke here
Near as I can tell the 100:1 mix has been fine. I'm not a mechanic and can only report the above as my personal experience. Like you I'd be curious if anyone has any firsthand experience SPECIFICALLY with this brand of motor that runs counter to using 100:1. here
Use ONLY 2-stroke outboard motor oil with an NMMA (National Marine Manufacturer's Assoc.) certified rating of TCW3.
Never use automobile motor oil in your 2-stroke outboard!
For 2-Stroke outboards that require a 50:1 premix of oil/gas we've put together the following chart to simplify the calculations.
Unleaded gasoline with a minimum octane rating of 87 is necessary; however, we recommend using an octane rating of 89, if possible, for best performance. here
During your initial break-in period you should use a 25:1 (double oil) mixture. See your owner's manual for complete details or view our Break-In Chart on-line. here
Unleaded gasoline with a minimum octane rating of 87 is necessary; however, we recommend using an octane rating of 89, if possible, for best performance. here
During your initial break-in period you should use a 25:1 (double oil) mixture. See your owner's manual for complete details or view our Break-In Chart on-line. [links]
We are uncompromising in our pursuit of outboard motors that are both durable and as light as possible. We pursue the ultimate in quality to deliver an inspirational engine experience.
The above oil brands are currently the only brands that have been tested and approved by our factory for use in TLDI systems. Brand names listed are trademarked by their respective owners.
For 2-Stroke outboards that require a 50:1 premix of oil/gas we've put together the following chart to simplify the calculations.