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post #1 of 10 (permalink) Old 01-11-2010, 07:03 AM Thread Starter
 
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2 stroke

Hi all having a few problems with my 2004 yz 250 did a fresh mix of oil and fuel last week and i think i put to much 2 stroke into the fuel as it smokes alot can i just put stright fuel into the tank till its not as smokey
thanks
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post #2 of 10 (permalink) Old 01-11-2010, 07:09 AM
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i like to err on the side of caution. the total amount of fuel mixture you created is probably 5 gallons right? premium fuel, around here is 3.35 per gallon.

i would drain your tank, trash the old stuff, and re-mix a new batch using the proper ratio. for 30 bucks you can be back on the bike with peace of mind.

thats just me though.

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post #3 of 10 (permalink) Old 01-11-2010, 07:25 AM Thread Starter
 
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Fuel

hi mate what is the ratio for a 2004 yz 250 will be the best mix ie 30:1
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post #4 of 10 (permalink) Old 01-11-2010, 11:01 AM
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depends on the oil, diluting it with fuel is an option yes, but the math gets complicated quick.

Personally I run 80:1 but the oil I run is also set-up for that.

When hell freezes over, we'll ride there too.
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post #5 of 10 (permalink) Old 01-11-2010, 11:31 AM
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Quote:
Originally Posted by buster123 View Post
hi mate what is the ratio for a 2004 yz 250 will be the best mix ie 30:1
your ratio depends on the oil as stated by junior. i use a castor type oil, as i dont ride in cold weather, and mix 32:1. if you dont mind doing frequent top end rebuilds you can run leaner than that, 40:1 or so.

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Originally Posted by Junior View Post
depends on the oil, diluting it with fuel is an option yes, but the math gets complicated quick.

Personally I run 80:1 but the oil I run is also set-up for that.
yeah, what he said

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post #6 of 10 (permalink) Old 01-12-2010, 04:06 AM Thread Starter
 
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2 stroke

Hi guys just rang yamaha and they said 30:1 mix but that is what i mix it up at the last time and way to smokey what mix should i go to plus bogging a little on top end power till warm plus last time i was out the plug went and on replacing it was black and had oil all over it to

Last edited by buster123; 01-12-2010 at 04:09 AM.
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post #7 of 10 (permalink) Old 01-12-2010, 07:39 AM
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ill venture a guess and say 32:1 should be a little better. if your fouling plugs its definitely too much oil. what brand of oil are you using? be specific....

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post #8 of 10 (permalink) Old 01-12-2010, 02:51 PM
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fouling plugs can also be from an overrich mixture, which will cause smokey running too.

When hell freezes over, we'll ride there too.
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post #9 of 10 (permalink) Old 02-24-2010, 12:37 AM
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Oh my! Which premix oil. Be specific for sure. Do not just put more gas in your tank to lean the mix out. Pretty sure 99% of us have been bench racing about that one!
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post #10 of 10 (permalink) Old 02-26-2010, 04:12 PM
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i have a 2000 yz250 bought it new and have run 40:1 with yamahalube R since it was new , replace the piston and rings about every 60hrs just like the manual tells you to and the cylinder looks great everytime i tear it apart and the yamahalube R leaves a nice thin film on everything , dont foul plugs very often , and only smokes hard when its cold , but thats normal for a 2-stroke.
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