Carbs and Sea Foam

i never use nothing in fuel and never had dirty carb ....but the sled aways sleep inside ...
 
daman said:
The best thing to do is fogg then treat fuel OR drain carbs, kiss her good night and tell her see ya next winter.
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In Michigan all high octane fuel uses ethonal (and doesn't require lableing).

Therefore, with a sled that requires high octane fuel, according to Yamaha draining and using in season fuel is the best thing to do.

Plus the differences in RVP between winter and summer blends causes other issues. The affects are more pronounced using winter blends in unseasonably warm ambients (i.e. vapor lock), but hard starts and tip in hesitations are common going the other way.

...and any sled whether high octane is a requirement or not, fogging not running during storage is also what Yamaha recommends.
 
snomofo said:
In Michigan all high octane fuel uses ethonal (and doesn't require lableing).

Therefore, with a sled that requires high octane fuel, according to Yamaha draining and using in season fuel is the best thing to do.

Plus the differences in RVP between winter and summer blends causes other issues. The affects are more pronounced using winter blends in unseasonably warm ambients (i.e. vapor lock), but hard starts and tip in hesitations are common going the other way.

...and any sled whether high octane is a requirement or not, fogging not running during storage is also what Yamaha recommends.
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thats why i sad "OR drain carbs" i agee tho....cant say all, theres plenty of stations around here that are eth free because i've asked,they'll tell you if you ask.

Not sure what you mean by summer winter rvp causing issues because the octane of a particular grade is constant throughout the year, the RVP vapor pressure(evaporation) spec changes with the seasons as does Butane.

but anyway.....yes i agree with you....


'
 
daman said:
thats why i sad "OR drain carbs" i agee tho....cant say all, theres plenty of stations around here that are eth free because i've asked,they'll tell you if you ask.

Not sure what you mean by summer winter rvp causing issues because the octane of a particular grade is constant throughout the year, the RVP vapor pressure(evaporation) spec changes with the seasons as does Butane.

but anyway.....yes i agree with you....


'
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I wouldn't rely on what the station owner says. According to the fuel and lube engineers I've talked to, there is no such thing as high octane fuel in Michigan without ethonal. And even lower octane (87) fuels are using ethonal too.

The change in Reed Vapor Pressure doesn't affect the octane rating, but does affect the boiling point and atomization. As I said before, the bigger affects are using winter blend in higher ambients, but using summer blend in cold ambients can affect driveability (hes, stumble, hard start).

Anyhow, I think we can all agree that because ethonal is so prevalent, using fresh in season fuel regardless of octane requirements is the best approach.
 
snomofo said:
The change in Reed Vapor Pressure doesn't affect the octane rating, but does affect the boiling point and atomization. As I said before, the bigger affects are using winter blend in higher ambients, but using summer blend in cold ambients can affect driveability (hes, stumble, hard start).

Anyhow, I think we can all agree that because ethonal is so prevalent, using fresh in season fuel regardless of octane requirements is the best approach.
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Agreed....
 
nosboy not that I did'nt believe you. I think I just read about it last year. If anyone is in dought. Try it and take a look at the carbs at the beginning of winter. Nothing to lose but a little bit of atf.
 
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