Powervalve issue?

[Moto7man]

Originally Posted by desertgasser300

Viton o-rings can be sourced from McMaster and Carr, O-Ring, 3 mm Width, 44 mm ID



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Those are the right ones. I keep a bag of these in the tool box. I have had to change them several times. About whenever you get vibration/rattle, its usually the orings. I have used so many of these that I need to order a new bag of them.

[Coop]

I ordered 4 of the KTM o-rings after reading several on here used them but wouldn't mind having a few more extras so I don't run out. Thanks for the tip about McMaster-Carr.

[bowhunter007]

I like to slather hi-temp silicone on my pipes for good measure.

[Pinittowinit]

I have a hypothetical question... What would happen if you kept the PV closed all the time.

[Jakobi]

The engine wouldn't flow very well and would feel rather restricted with no real upper rpm.

[Zman]

The pivot bolt broke off one of our 300s and it ran fine on the bottom end and ok in the mid range but it had a significant reduction in top end power.

[bigtoe]

Hi, is there a trick to get the right side case off so I can adjust my power valve, I've taken every bolt off around the outside as well as the clutch cover and water pump cover and impeller, have been gently tapping case with rubber hammer but the bloody thing won't budge, rock solid, thanks

[john r b]

Sounds like the dowls are stuck, continue to gently tap around the cover.
It may take a while. but you will get it off.best of luck.

[Jim Cook]

Originally Posted by bigtoe

Hi, is there a trick to get the right side case off so I can adjust my power valve, I've taken every bolt off around the outside as well as the clutch cover and water pump cover and impeller, have been gently tapping case with rubber hammer but the bloody thing won't budge, rock solid, thanks

Unless you haven't yet removed the kickstart lever, I echo the previous reply. Either dowels are stuck or the previous mechanic used enough gasket sealer to "glue" it on. I either install my gaskets dry or grease them, except for the ignition cover.

Good Riding and Wrenching to You!
Jim



.

[Jakobi]

Same as Jim. I just grease the gaskets and they seem to break away quite cleanly when required.

The dowel down near the water pump will likely be the one thats causing the issues. A little heat, some penetrating fluids, and a mallet might get things moving in the right direction.