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Re: Sleeving RZ Powervalve bores?
Posted: Tue Dec 29, 2015 11:53 pm
by 2TInstitute
L.B. wrote:Lozza I think Jon means the pv bore has gone oval in some cases.
I just bought a set of barrels that have been welded & re-machined,seems to be a nice job done but as Jools said it would be a bear of a job to get right in setup.
But if you guys doing a bulk buy/job lot Im guessing a jig of sorts (angle plate etc) could be made to machine multiple barrels & again as mentioned there is the issue of dissimilar metals.....an issue that a metalurgy specialist can answer?
I couldn't work out if the bores bushes or pv itself has worn. The cost of making a jig alone could have you buying every used RZ cylinder in existance.
Re: Sleeving RZ Powervalve bores?
Posted: Wed Dec 30, 2015 9:10 am
by JonW
Yep I was talking about the bores for the PVs, cyl bores being of no consequence to the wobbly PV problem.
Re: Sleeving RZ Powervalve bores?
Posted: Mon Jan 04, 2016 6:18 pm
by jools
Ok, I know the powervalves are different on the 250 and 350, but are the bushes and seals interchangeable?
Re: Sleeving RZ Powervalve bores?
Posted: Tue Jan 05, 2016 8:43 am
by gman
Seals are the same part number. Quoted $24 a seal from yamaha australia. Boats net usa $6. Bushes are different. Apparently the brass alloy insert in the 250 bush can be punched out and used inside 350 bush. Im doing the valve bushes in my 350 at the moment.
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