found problem with bogging 670

[Dano670]

after going thru carbs,aand dpm system several times we decided to pull the head to see what was going on .Found pto side piston was failing,pulled both jugs and could see where sides of piston were damaged by a foreign material that later turned out to be failing pto side bearings.Our skidoo guy said it was a good thing we pulled the head ,otherwise the engine may have grenaded.Engine is being rebuilt and under his recommendation clutch will be balanced.I would like to thank every one for all your helpfull tips that led us to this point.

 

[99summitx]

Glad you found it in the shop and not 40k back in the hills. Thanks for the update.

 

[Dano670]

thanks summitz,its so bizzarre that engine was so responsive and ran like it did with a bearing problem and piston that was on its way out.I said to him well this machine rocked with a bad piston ,wait till you get both cyls firing. lol