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2 stroke oil tank missing

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hey guys just bought a 1995 pw80 off a buddy .. but the the 2 stroke tank that belongs under the seat is gone. anyone know what i should do or where to buy one/ . thanks.

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It sounds like it was modified to just run premix gas - my dad did the same thing, but you have to run a bigger jet to compensate for the oil taking up space in the fuel.

Otherwise you could find the tank at a Yamaha dealer or online, and maybe check the online manual to find where the tank hooks up to the carb.

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Yeah that would make sense.

There's less gas going in because of the oil being mixed in, and to compensate your giving it less air with the choke on.

You could probably do a google search and someone will have mentioned what size jet they used.

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Just adding the oil tank back on and hooking it up probably won't fix your problem.

 

Normally when folks remove the oil tank, they also remove or at least disable all of the rest of the oil injection system.  So you would probably need the whole oil injection shooting match to get things right.

 

For your problem of not running without the choke, you most likely have a dirty carb.  Start with a thorough cleaning and make certain that all of the jets and passages are clear of any gunk.  Verify your jetting with the online parts fiche for your year, and clean and oil the air filter.  Put in a new plug (of the proper heat range), and see what you have.  Also, what ratio are you running with the premix?  A PW80 should run fine on a 24-32:1 ratio as the revs are not that high and the performance is pretty low. 

 

Another thing to check would be excess carbon build up in the pipe/silencer.  Very common for oil injected bikes that have been modified for premix to have too much oil in the fuel, which doesn't completely burn up and instead is pushed to the pipe where it plugs things up over time.

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