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Dave2302
08-16-2009, 12:50 PM
Hi Guys,

:confused:

Can anyone tell me what transmission ratio and prop shaft size is on a 350 hp 1998 x star, also are they the same rotation? A guy over here has a prop off his x star for sale but doesn't know the pitch or shaft size etc, and I need to know if it will fit my 190 Prostar B4 i buy it

Cheers Dave

TMCNo1
08-16-2009, 01:40 PM
Hi Guys,

:confused:

Can anyone tell me what transmission ratio and prop shaft size is on a 350 hp 1998 x star, also are they the same rotation? A guy over here has a prop off his x star for sale but doesn't know the pitch or shaft size etc, and I need to know if it will fit my 190 Prostar B4 i buy it

Cheers Dave


There should be a tag on top of the transmission that tells the manufacturer and ratio. Anything other than 1:1 should be 1 1/8" shaft, 1" shaft for 1:1 and all should be LH rotation.
Is your shaft splined or keyed?
I really don't think a X-Star prop will perform too well on a Prostar, you might just be buying a paperweight if you don't do your research.

Dave2302
08-16-2009, 04:31 PM
There should be a tag on top of the transmission that tells the manufacturer and ratio. Anything other than 1:1 should be 1 1/8" shaft, 1" shaft for 1:1 and all should be LH rotation.
Is your shaft splined or keyed?
I really don't think a X-Star prop will perform too well on a Prostar, you might just be buying a paperweight if you don't do your research.

okay thanks, will ring MC dealer, but sounds like its a no go....Itts just that good second hand ones are rare in UK, and this one wasn't too dear :(

Dave2302
08-16-2009, 04:33 PM
BTW mines a 94 Prostar, keyed 1" shaft and 1:1 tranny

Chicago190
08-16-2009, 04:54 PM
BTW mines a 94 Prostar, keyed 1" shaft and 1:1 tranny

I'm pretty sure it won't work, I believe all v-drives have 1 1/8" shafts.

Jim@BAWS
08-16-2009, 07:11 PM
I'm pretty sure it won't work, I believe all v-drives have 1 1/8" shafts.


In 1998 MC did not make a V Drive X Star

Those where the All GREEN or MED blue ones w/ a DIRECT DRIVE inboard

Probably has a 13 x 13 4 blade on it

Jim@BAWS

Chicago190
08-16-2009, 07:21 PM
In 1998 MC did not make a V Drive X Star

Those where the All GREEN or MED blue ones w/ a DIRECT DRIVE inboard

Probably has a 13 x 13 4 blade on it

Jim@BAWS

Was I at least correct that all v-drives have 1 1/8" shafts?

Jim@BAWS
08-16-2009, 08:23 PM
Was I at least correct that all v-drives have 1 1/8" shafts?

Yes...All v drives and also POWERSLOTS 14 x 18 props

There is alot of confusion when MC made the first 205V / Vdrive X -star in 1999

Jim@BAWS

Dave2302
08-17-2009, 05:41 AM
In 1998 MC did not make a V Drive X Star

Those where the All GREEN or MED blue ones w/ a DIRECT DRIVE inboard

Probably has a 13 x 13 4 blade on it

Jim@BAWS

So if its not a V drive and has a 1" key shaft like mine it should be okay then ?? Do 4 blades work on Prostar okay ?
My Prostar's currently running great with a 13 X 13 3 blade OJ, but I dinged it slightly and want a spare, before I get my OJ fixed. (boat currently in use every day for my ski school).
We use it for general all rounder boards and skiing, don't use it to foot as I have O/B barefoot boat for that.

I have to phone the guy later with an answer, can buy this as new prop cheap but don't want to buy a paperweight :D

Dave2302
08-17-2009, 11:06 AM
Okay the guy has come up with the following, stamped on the hub:-

12.5 X 12 V (I or L ??) C OJ

This is a 1" Keyshaft prop, so thats okay but will it make much difference to my top end speed and RPM per MPH at say 30 MPH :confused:

Thanks in anticipation

Dave

TMCNo1
08-17-2009, 12:04 PM
It may pay you to contact Eric at OJ Props, http://www.ojprops.com/contact_us and ask him since you are on the other side of the big pond. I would think he could advise you to prevent getting something unsatisfactory for your boat.

Dave2302
08-17-2009, 12:11 PM
It may pay you to contact Eric at OJ Props, http://www.ojprops.com/contact_us and ask him since you are on the other side of the big pond. I would think he could advise you to prevent getting something unsatisfactory for your boat.

Thanks TMC, have been onto Eric and also Jim and he reckons a 4 blade as stamped will be almost the same as my 3 blade OJ so I'm gonna try and strike a deal with the seller.

I'd buy a new one from Eric but it is the carriage costs that are prohibitive for me, (half the cost of the prop).

This one is used but undamaged, and as new and I can get it about half retail, so if it'll work as a satisfactory spare I'll be well happy:D

It seems that the consensus is yes it will:D

Cheers guys,

Dave

Dave2302
08-17-2009, 02:18 PM
Just bought it for 199 plus p+p.

Result :dance:

Dave2302
08-20-2009, 05:33 PM
Well, the "as new" prop arrived yesterday and it is !! Tried it today :):)

Absolute mutts nuts for my application, so thanks Jim and Eric, for your patience and advice as you both said its very similair to the 13 X13 3 blade OJ, with which I was quite happy. After using it all day today for a variety of different disciplines and abilities, weather and water conditions pretty much the same as yesterday, I have observed the following...

Pulls out the hole / grips a stronger, especially on heavy throttle.

Smoother power delivery especially on heavy throttle.

Fuel consumption slightly better.

A loss of about 1 mph top speed, (doesn't matter), still pulls 44 mph at 4800 rpm (GPS).

Slightly smoother across the table on Ja Skis especially noticeable doing back one foots!!

So now I can send my slightly dinged 3 blade for repair and then I'll keep that as a spare and leave the 4 blade OJ on the boat.

Interestingly this is pretty much the same findings but not quite as big a difference as when switching my 225 Yamaha outboard 'footin boat from a 3 Blade Laser II to a High 5 prop.
The 4 blade Inboard prop also reverses okay, where the high 5 on the outboard has bog all pull when using reverse LOL

Thanks to Graeme who sold it me ;)

Happy Bunny:D

TMCNo1
08-20-2009, 06:43 PM
Glad it worked out in your favor, stay happy!

Dave2302
08-21-2009, 02:00 PM
Glad it worked out in your favor, stay happy!

Cheers buddy