90 SPORTSMAN bogs under power
#1
05-20-2018, 11:36 PM
Join Date: May 2018
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90 SPORTSMAN bogs under power
I have a 2 stroke sportsman 90 I think it’s a 2008 or 2007
so I made an extremely bone head decision.
i haven’t had a 2 stroke anything since a dirt bike I had a long time ago.
thatbike needed to have the gas mixed, so I filled a gallon gas can with fuel and mixes it with 2 stroke oil 50:1
it was running fine right before this dumb mistake.
i got about a half mile down the road and it has no power once the throttle is opened too far. Can’t climb any sort of hill at all.
I limp it back to the gas station, I can’t get the hose off the bottom of the gas tank so I tipped the wheeler upside down and poured out all the gas in the tank and tipped it back up.
filled with brand new fuel from the pump.
still same problem.
i figured it would just have to clear out so I rode it a ways, no luck.
changed the spark plug.
drained the float bowl.
notuing,
pulled the air filter thinking I might have filled it with oil when I tipped the wheeler upside down, nope.
i limped it Home (like 6 miles)
never got any better.
any ideas?
it was running fine before I put the wrong fuel in it.
so I made an extremely bone head decision.
i haven’t had a 2 stroke anything since a dirt bike I had a long time ago.
thatbike needed to have the gas mixed, so I filled a gallon gas can with fuel and mixes it with 2 stroke oil 50:1
it was running fine right before this dumb mistake.
i got about a half mile down the road and it has no power once the throttle is opened too far. Can’t climb any sort of hill at all.
I limp it back to the gas station, I can’t get the hose off the bottom of the gas tank so I tipped the wheeler upside down and poured out all the gas in the tank and tipped it back up.
filled with brand new fuel from the pump.
still same problem.
i figured it would just have to clear out so I rode it a ways, no luck.
changed the spark plug.
drained the float bowl.
notuing,
pulled the air filter thinking I might have filled it with oil when I tipped the wheeler upside down, nope.
i limped it Home (like 6 miles)
never got any better.
any ideas?
it was running fine before I put the wrong fuel in it.
#2
05-21-2018, 12:59 AM
Quad Patrol
Your Question Has Been Answered By Our Editors
We've got the answer you seek on the ATVC homepage, which can be viewed directly here:
https://atvconnection.com/articles/a...wrong-strokes/
#3
05-21-2018, 09:50 AM
#4
05-21-2018, 03:47 PM
Well...less oil just means less lubrication and a higher likelihood of premature ring/bearing failure...actually, less oil will create a slightly richer (fuel/air) condition...the oil, while made to burn in the combustion chamber, is not the fuel...in any event you should check your compression as suggested above...
#5
05-21-2018, 03:52 PM
"so if you ran it lean then you have cooked the top end probably. Do a compression check and that should tell ya for sure. from reading online those should be around 32-1 but they were also oil injected"
"Well...less oil just means less lubrication and a higher likelihood of premature ring/bearing failure...actually, less oil will create a slightly richer (fuel/air) condition...the oil, while made to burn in the combustion chamber, is not the fuel...in any event you should check your compression as suggested above..."
As the article stated, "The 2007/ 2008 Polaris Sportsman 90s were equipped with 4-stroke engines."
"Well...less oil just means less lubrication and a higher likelihood of premature ring/bearing failure...actually, less oil will create a slightly richer (fuel/air) condition...the oil, while made to burn in the combustion chamber, is not the fuel...in any event you should check your compression as suggested above..."
As the article stated, "The 2007/ 2008 Polaris Sportsman 90s were equipped with 4-stroke engines."
#6
05-22-2018, 08:28 AM
"As the article stated, "The 2007/ 2008 Polaris Sportsman 90s were equipped with 4-stroke engines."[/QUOTE]
Regardless...a compression check is in order! And...2-stroke oil, at 50:1, would do nothing to a thumper motor (at least not for the duration stated)...
Better yet, perhaps the poster got the year incorrect as 2006 was a 2-stroke and the post mentions (more than once) that it is a "2-stroke" and that he had "2-strokes" in his past...
Regardless...a compression check is in order! And...2-stroke oil, at 50:1, would do nothing to a thumper motor (at least not for the duration stated)...
Better yet, perhaps the poster got the year incorrect as 2006 was a 2-stroke and the post mentions (more than once) that it is a "2-stroke" and that he had "2-strokes" in his past...
#7
05-22-2018, 01:38 PM
It's hard to actually know what he's talking about, but if it was a 4-stroke as a 2007 or 2008 would have to be, then he didn't use too little oil in his gas/oil mixture. And if it is an older than 2007, oil-injected 2-stroke, which I'm guessing is the case, he didn't use too little oil in the mix. Whether it was a 4-stroke or 2-stroke there shouldn't be any oil in the gas.
ETA: If it was getting oil injected at a rate of 32:1, plus 50:1 from the pre-mix, as it sounds like, then it wasn't getting less oil than it should have. It was running on 20.5:1. No wonder it ran like crap. Nothing I ever owned ran on 20:1. My old weed whacker runs richer than everything else I've had at 32:1.
ETA: If it was getting oil injected at a rate of 32:1, plus 50:1 from the pre-mix, as it sounds like, then it wasn't getting less oil than it should have. It was running on 20.5:1. No wonder it ran like crap. Nothing I ever owned ran on 20:1. My old weed whacker runs richer than everything else I've had at 32:1.
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