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2stroke oil ratio for 15hp Yamaha 2015
- Thread starter Fishpaste
- Start date
Mate I'm not an expert on that specific 2-stroke motor, but the general rule is 2% for 2-strokes.
You really do not need to add more than this as you will simply foul the plugs and rings and make a mess of unburned oil - so 2% is the max you will need.
Just make sure it's Marine TC-W3 and not normal 2stroke oil.
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And then just some advice that you might want to use/loose. A very old marine mechanic said the had 2 tanks - one smaller one mixed at 1% for slow speed trolling. He complained that slow speed trolling at 2% usually left lots of un-burned oil and fouled plugs and eventual stuck rings. He had infact been running his motors on 1% for 90% of operation and all good. No internal stress of damage at all and first pull starts as the plugs stay clean.
So in effect 2% is probably over oiling a bit for general use but only you will know if you run your motor WOT from the start, or do you take it slow.
I'm happy to run 1,5% - less is more so long as you have good oil.
You really do not need to add more than this as you will simply foul the plugs and rings and make a mess of unburned oil - so 2% is the max you will need.
Just make sure it's Marine TC-W3 and not normal 2stroke oil.
---
And then just some advice that you might want to use/loose. A very old marine mechanic said the had 2 tanks - one smaller one mixed at 1% for slow speed trolling. He complained that slow speed trolling at 2% usually left lots of un-burned oil and fouled plugs and eventual stuck rings. He had infact been running his motors on 1% for 90% of operation and all good. No internal stress of damage at all and first pull starts as the plugs stay clean.
So in effect 2% is probably over oiling a bit for general use but only you will know if you run your motor WOT from the start, or do you take it slow.
I'm happy to run 1,5% - less is more so long as you have good oil.
Guppigetta
New member
Hi guys,Yamaha two stroke motors run on 100:1 mixture (ie 1% ). A lot of boaters use 50:1 which is 2% when they mix oil in their fuel tanks. Don't know why. My 60 hp Yammy has been running on factory specs of 100:1 all the time and nothing wrong with it.