Posts: 3508
Location: Elk River, Minnesota | Hi again,
ok...idle speed ok, but when you hit the throttle hard does it bog down at all? How much smoke do you have when you get going after idle?
My gut instinct is the issue is not your tank...the filter systems you have in place should take care of any fuel issues you may experience when it comes to water and debris.
I do have a suggestion for you to try before doing anything with the fuel tank...
That particular motor I believe should have what looks to be a tire valve stem somewhere located behind the carbeurator...might have a cap on it... If it does and you can find it, get a can of OMC (or bombardier equivalent) decarbonizer. What I am thinking is this: you are dealing with a large amount of carbon build-up in the compression chamber and it is affecting performance. The OMC decarbonizer comes in a can that has about a 6" hose attached to it, with the little screw cap on it to connect to the stem behind the carbeurator. Get the motor warm (not hot...just warm), then set it to a high idle (no more than 2000 rpms. Start spraying shots from the can to the motor...it will start to idle rough and blow white smoke...keep doing it a few more times, then give it a big long shot until the motor kills. Then...hold it for a little longer. Let the motor sit for about 1/2 hour, then go and run it a while to clean out all the gunk...there will be a bunch of white smoke for a bit, but run it until it is no longer burning out white smoke.
Once that is done, let the engine cool and replace the spark plugs. Then go out and see how the motor works. If nothing changes, then the diagnosis can continue. My bet, though, is that you will find the motor to be running really well. If the motor has never had a decarbonizing process done to it, you will find this can make a world of difference in the performance of the engine...
If you are unable to find the OMC stuff, you can do this as well with a can of mercury powertune (it is the same stuff, but must be sprayed into the carb throats...not hard, but probably requires removing the air box first...) And follow the same procedure as above...
Something to try...
Steve
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