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KCL
05-26-2009, 07:29 PM
I have a 1999 polaris sportsman 500 with really low miles and hours. It recently started to knock when you get the rpms up. At idle it is fine. I runs perfect and starts fine. Any thought?

Restrorob
05-26-2009, 10:21 PM
Is it a top end or bottom end knock ?

Is it knocking in neutral or under load (riding) ?

The Sportsman has a speedo on it, How many miles/hours ?

KCL
05-26-2009, 11:16 PM
Seems to be the top end. It knocks in nuetral and in drive. It has about 1000 miles


Is it a top end or bottom end knock ?

Is it knocking in neutral or under load (riding) ?

The Sportsman has a speedo on it, How many miles/hours ?

Restrorob
05-26-2009, 11:54 PM
Well,

You could check the valve clearances, Back in 98/99 they had some issues with exhaust cam lob wipe-outs. Also check the exhaust flange gasket for leaks and make sure the pipe springs are not stretched. The only other thing that comes to mind is a tear-down inspection, Remove the top end and check the wrist pin bearing and crankpin journal bushing.

SLR
05-27-2009, 08:04 PM
How old is gas in tank?

KCL
05-28-2009, 08:27 AM
Not very old. I'm thinking maybe I need to run a higher octane

AI Inc
05-28-2009, 08:47 AM
My trucks drink regular , everything else ( Harley , boat 4 wheeler , snowmobile ) drink super.