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Fuel-Oil Mixture for Newer Yamaha Two-Cycle
|Author||Topic: Fuel-Oil Mixture for Newer Yamaha Two-Cycle|
posted 04-01-2009 11:26 PM ET (US)
[For a] 2006 Yamaha 25-HP two-cycle, what is the proper mixture of gas and oil? [When I] bought the motor, the dealer said to use a 50:1 mixture. [When I] showed him the 100:1 sticker on the side, he said it was mislabled. [The] owner's manual says 100:1, but [I] wonder if [Yamaha] is just trying to get better emissions. [Would] it be better for my motor to run at 50:1? [Would] it last longer at 50:1? [Thanks]
posted 04-02-2009 07:05 AM ET (US)
100:1 is correct ratio! I have had 4 of these engines and always used above ratio and put on lots of hours. Two of my engines were oil injected so not a concern. Now, 50:1 would be ok, I think, but a waste of oil! Beam me up... Clark... SCN
posted 04-02-2009 07:25 AM ET (US)
I would use the manufacturers recommendation of 100:1. If 50:1 were acceptable, it would say so in the manual. Will 50:1 cause your engine to blow up? Probably not. But you will likely be fouling plugs more often and receive decreased overall performance, not to mention the extra expense of the oil itself.
posted 04-02-2009 07:55 AM ET (US)
With such a high ratio of gasoline to oil, be sure to use good oil to lubricate that motor.
|Tom W Clark||
posted 04-02-2009 09:15 AM ET (US)
If you use the motor quite frequently, the 100:1 ratio will be fine. If you use the motor infrequently, I would hesitate to use so little oil.
OMC went to a 100:1 gas/oil ratio in the late 1980s for their non-VRO models. The motors ran fine and used only half as much oil. But a problem developed when a motor was not used very often.
There was so little residual oil left on the cylinder walls, corrosion or rust would begin degrade the cylinder surfaces of motors left unused over along period of time. Motors run daily, or near so, did not suffer this problem.
OMC went back to the 50:1 recommendation and recommended the motors sold with the 100:1 stickers and manuals do the same as well.
Again, motor that were used a lot and spent little time between operations were not affected.
posted 04-02-2009 12:09 PM ET (US)
tom, thanks for the reply, solid information.
posted 04-02-2009 01:43 PM ET (US)
Tom is dead on....as usual. I usually ran my Yamahas with 75:1 just to be sure. 50:1 is probably overkill.
posted 04-02-2009 04:29 PM ET (US)
check the manual to see if it specifies a specific oil or specific type of oil for the 100:1 mix.
posted 04-02-2009 04:36 PM ET (US)
Virtually all Yamaha manuals (I have yet to see one that doesn't) will specify Yamalube. They may also suggest that other TC-W3 rated oil is acceptable.
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