rotary valve shaft

[lalo]

new here was wondering if any body could help with removal of rotary shaft?ive removed everything down to the snap ring on the shaft just cant get shaft to come out.how do you test or check if it is bad or gear is bad.

[Seadoomax]

Re: rotary valve shaft

you can make a puller using a long 6 mm screw you screw it into the end of the shaft and pull with a dent majic hammer or you can do what Ive seen done and use a come along and put the case in a vise and work it out. As far as checking it take off rotary cover and see if when cranking the motor it moves may be that brass gear is stripped.

[lalo]

Re: rotary valve shaft

ive already pulled the motor so icant turn over but by hand everything turns fine.so you dont really need any special tool?.

[1fastski.com]

Re: rotary valve shaft

the spl tool is a cup with a hole in the middle with a bolt and nut . but the puller idea works fine . to test the shaft roll it on a glass table you can tell very easy if it wobbles . or if its in the engine and you have the cases split you can spin it you will also beable to see if its bent . chances are if the brass gear is gone its bent .

[lalo]

Re: rotary valve shaft

well i decided to go ahead and totally disassemble bottom end since i had no luck (didnt try much)with removing rotary shaft.wanted to check out crankshaft and inside of cases anyway .I figured I could check shaft once cases were split.everything seems to be in good conditon brass gear looks like new .But I did notice when dissassembling the statorand flywhee a few problems.on the flywheel the keeper , keyway or screw(not shure what it is called)that holds flywheel from turnig on the shaft was split in half .second the marks on the stator cases for timing were way off.so i beleive these caused the timing issues i was having and not the rotary shaft.would this be true?

[Bill O'Neal2]

Re: rotary valve shaft

Yes if the brass gear is not stripped, then nothing is wrong with the RV shaft. A split woodruff key will definately allow the flywheel to turn and screw up your ignition timing big time. Align the tick marks on both the stator and cases.

[lalo]

Re: rotary valve shaft

can you advance the timing on these things like you would a car when it is modified?dont think anything is modified on ski except it has r&d head.just thought maybe that is why timing was moved?also I need to redo top end pistons are 1.00mm now I was told that I would need to resleave cylinders but i noticed sbt offers 1.50mm top end kit would this be next size up?I dont know to much about skis.

[Bill O'Neal2]

Re: rotary valve shaft

You could bore it to 1.5mm oversized. If you have an R&D head, you should not advance the timing. Set it to oem specs if you plan on buying pump fuel.

[lalo]

Re: rotary valve shaft

is there any difference between the r&d and stock heads?when i took apart the cases i noticed there was no gasket between them is this standard?whatelse should i look for before putting bottom end back together?where would be a good place to send jugs to be bored to next size and do you need piston sets first?I called a few places here in vegas but seems a bit high but not sure.

[Bill O'Neal2]

Re: rotary valve shaft

Buy the pistons online from SBT, just click on the big SBT logo and go to "Online shopping cart".
Take the pistons and clyinders to a jetski or ATV/Motorcycle shop and get them bored.
Neither oem SD or R&D use head gaskets. They both use orings to seal the head and clyinder water jackets at the top of the clyinders.
An R&D head is a high performance aftermarket head that bumps up the compression ratio of the motor. High compression, combined with advanced timing and lousy pump fuels equals lots of siezed pistons, and that may be why you are buying 1.5mm oversized pistons......

[lalo]

Re: rotary valve shaft

i wasnt asking about the head gasket i was asking about the crank cases does it take a gasket between both the cases?with that r&d heaad should I be running race fuel (100 octane)?

[Technical Support]

Re: rotary valve shaft

You need to get an OEM service manual right away.


No cases do not use gaskets, just sealer.

[Bill O'Neal2]

Re: rotary valve shaft

Not if it is a pump gas head. They make them with a choice of different compression ratios.

[lalo]

Re: rotary valve shaft

Ive looked all over it and there is no markings on it except R&D on the outer lip.but thanks I really appreciate your help

[Bill O'Neal2]

Re: rotary valve shaft

Try asking R&D Racing. They made it.