250-500cc CLICKING SOUND WR 250

Hi,
I have a WR250 with a 95 - 98 Motor.
When I use my hand to turn it over with the kick start lever,
I can Hear a clicking sound from the Pipe / Powervalve / Powervalve gear area.

It does not do it with the plug out,
and turns over freely and smoothly.

I hope it's not the powervalve catching a ring.

Might adjust the stop on the Powervalve to move it away from the piston a bit,
but it runs/ rides fine and turns so well without the plug in it.

Anyone have any ideas, or is this normal?
Cheers

HI,
The noise was the Powervalve.

I noticed if I turned the Powervalve open a bit while cranking the Kick start lever,
the noise that sounded like rings catching / clicking disapeared.

Took off the the head and found that the powervalve is a bit loose, and has 1 - 2 mm of free - play.

This was the noise PLAY IN THE POWERVALVE.

This also means it (2 parts) can flop around side to side a bit, making the outer edge of the powervalve closer to the piston,
and meaning it would likely catch first there.
The Up - Down play was causing the noise.

It hasn't caught but I still adjusted the powervalve up about 2.5mm, like people have been for MX use.
This also gives more clearance for the powervalve, and reduces / eliminates the possibility of it catching a ring or piston.

It seems to be the lower Powervalve cover holes have gotten warn,
as my other, More carboned up barrels Powervalve has around half the freeplay, and the noise is coushioned by the carbon + oil.

How Much freeplay should a clean Powervalve have in the bore,
Up -down and Side - Side?

Does anyone do bronze sleeves / bushes for the Powervalve holes in the lower cover, as it seems a waste to buy a new part just for that.

Cheers

Bump old thread but im looking at valve guides phosphor bronze ones to stop my rattly pv on 360.
Am going to remove them tempory and blank off the holes to see if it really is the slop but have about half a mill rattle every direction slightly more on the left side.

Did you fix the issue?

Just had mine out - you need to change the worn bushings - common part you can get at Mcmaster Carr. 15X21X16. You can use a smear of JB Weld if the bore is worn when installing. I have an 04 motor so I'm not sure if the 98 is the same.

Different on 360 buddy ive got two wich go above the exhaust they pull up and towards the front of the bike the runs are worn i assume sooo im doing bronze inserts in pv cover to limit wobble factor.

P.s.(post script if you didnt know)
Going to do phosphor in pv cover.

a friend bushed his 360 with great results
he used automotive parts and had the holes reamed to fit the bushings, then reamed the bushings to fit the power valves
running them in the aluminum worked for a few years but became sloppy eventually
plan to do this to mine when i pull the barrel

Yeah thats my plan, cant think of a way to shim the flat part of pv holes so doing the cover, its bound to wear steel chattering on ali yes the ali is hard but its softer than steel.