Custom/Hybrid Powervalves-tolerances

[SJ Thumpa]

There are a few powervalve cylinders available.

I was just wondering exactly how you should measure the acceptable wear tolerances for the guillotines/guilotine slleeves in a used cylinder {if you were to buy or own one} and what the tolerances should be specificly for the cylinders now available?

Thanks

 

[SUPERTUNE]

The machined slot where the power valve slide goes doesn't really wear much in all of the cylinders I've seen. (even old DASA cylinders)
The wear problems are where the stem of the slide valve and the hole in the slide housing wear out, this causes performance and leakage problems.
Just replace with new parts and some fitment labor and your good to go.
All the new billet parts from DASA is about $350!

 

[Mark44]

The slides in my SeaPoo motor are really worn on the edges I guess I should replace them some day.

Mark44

 

[the only couch rider]

chuckie,

do you foresee you guys making a retrofit kit using your p/v's and the yamaha pv cylinders on the gp800 and gp1200r motors? the sitdown crowd could be all over these as a viable solution to the riva kit

 

[wsuwrhr]

All the new billet parts from DASA is about $350!

If necessary, ALL of the parts would be about $350.

I would only replace the springs and bellows to be truely freshed up, a minor cost and these are all stock Seadoo parts, available anywhere.

Unless the components are damaged in an engine mishap, properly maintained, the valve and housing should really last the life of the cylinder.

Otherwise, if the valves and housings are damaged or worn and did need to be replaced, I would RE-USE the top cap, adjuster screw and the billet piston. This would bring the total replacement cost to somewhere around $250.

Brian

 

[SJ Thumpa]

Thank you very much Chuckie and Brian. really appreciated and understood.

My motor has been (what looks to be) heat damaged at some stage. The machined slots look to be good but the sliders have some discolouring and what looks like glazing on each side (on each rounded sliding edge) that has me worried.

The plastic PV caps were burnt through (an arc on each side closest to the b pipe spacer) and the screw on plastic caps (that hold the sliders) were scorched. The bellows and everything else seem fine. I've gone ahead and replaced everything anyway so far apart from the sliders and billet slide housing.

Hence my question.

Are there any measurements (sideways movement?)that I could do on the sliders (or PV cuts) or billet housing holes (thanks Chuckie, I never thought of that) to check possible wear (slop) or distortion or should I just go ahead and replace the sliders and slide housing for peace of mind?