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Posted by: oldyeller
I second the exhaust being plugged..Some of the early models actually had a little restrictor that went on the tail pipe to make it smaller..Make sure its not on there.
Posted by: oldyeller
The Polaris two stroke 90s are definetly not underpowered when they are running properly..
Posted by: oldyeller
Wow $300 sounds like a lot..The top end is pretty easy to replace if your mechanically inclined at all but either way I'm glad you found the problem..A compression gauge is handy to monitor how much the engine is wearing..Our viper was 120psi when new and I check it every year to see how its doing...If yours was only at 30psi it was truely very sick!
Posted by: Trasher
Make sure that the exhaust is not plugged. Check the port by the head to see if it's closed off by carbon and the muffler. It might be soaked with old oil deposits clogging it up. Good luck and let us know what you find out.
Posted by: num482
We are having a similar problem with a Predator 90, called dealer to see what they said. Service guy mentioned it was probably the stator, they get full of mud, and over heat causing damage. Haven't verified if that's the cause yet but it definitely sounds like it could be the problem.
Posted by: itch
do a compression test, sounds like its time for a new top end
Posted by: itch
sorry to hear that .. we were full of free ideas here but we never heard back from you after your initial post to see what you actually tried ..
nathan , you get yours figured out yet?
Posted by: itch
this time
thanks,
Rich aka "itch"
Posted by: AIRMOBILE101
"ITCH" you nailed it first!!!! Congrats!!!
Posted by: chabat
Let us know what you find out. My son likes that quad and we were looking at them, but if they are really underpowered, I will avoid it.
Posted by: Zak Attack
I just purchased a 2001 Sportsman 90 for my son. It starts hard and once it is running has little power. completely useless once it gets hot to where it will continue running but will not move at full throttle. I have removed and cleaned carb, added fuel treatment and Gumout as it sat for a couple of years in previous owners garage. Any ideas as to the lack of power?
The boy just sits and looks at it hoping it will heal itself.
Posted by: Zak Attack
Nathan,
I took our Sportsman 90 to the Polaris dealer yesterday as I ran out of ideas. I'll let you know what they find.
Zak
Posted by: Zak Attack
Dealer finally called yesterday. ATV needs a new top end. Compression was at 35PSI spec is 90 I believe.
$300.00 later we'll be up and running!
Posted by: Zak Attack
You got that right!
Dealer finally called yesterday. ATV needs a new top end. Compression was at 35PSI spec is 90 I believe.
$300.00 later we'll be up and running!
Posted by: Zak Attack
Dealer finally called yesterday. ATV needs a new top end. Compression was at 35PSI spec is 90 I believe.
$300.00 later we'll be up and running!
Posted by: estyle101
Hi there,
I also have purchased a sportsman 90 and am having power issues. It will run but only at an idle. When you give it gas it will shut off. If it is running and you lift up the back end it will run out nicely. I have checked the carb, the pipe, the clutch, and belt and all looks good. Did you have any luck figuring yours out? Please let me know any helpful information. I will do the same.
Thanks alot,
Nathan
Posted by: estyle101
Guys I have not had time yet and I will be out of town until Saturday. I will work on it some more then. I will for sure let you know if I have figured it out. You guys are great.
Thank you,
Nathan
Posted by: estyle101
Zak,
What did they find out with your 90? I am still having problems and cant figure it out. I am starting to think that the CDI is weak? Does any one have a CDI that they would sell?
Thanks,
Nathan
