Long reach engine coupler

[yamanube]

I might just try and drill and tap a 550 coupler first. I think a 550 coupler and a spacer on the engine side will get me there.

 

[WFO Speedracer]

It looks like the engine side coupler is standard length and the midshaft side coupler is the extended portion, which won't work for me because I am using a Kawasaki driveshaft rather than Yamaha midshaft.

I can measure up a 550 coupler tomorrow for length, I have a stack of those things somewhere here

 

[fastgtfairlane]

The 550 coupler is 3/4 inch longer than the sxr coupler. I know this because I used a rhaas engine adapter for a 550 ski I swapped a 750 into several years ago and was able to use the 750 coupler with the rhaas adapter as it has 2 positions for engine placement. The couplers were 3/4 inch difference in length according to robin.

 

[holjen77]

I have an Aerial 8 and i have run kawi pump with a SXR driveshaft with 16mm of threads cut off and with a Yami pump and a WR3 midshaft. There were provisions to run either pump and either type of midhaft built into the hull. Hope this helps.

 

[Ducky]

maybe @Sasquachcrap could build you a custom driveshaft?

 

[JetManiac]

I have a set of the extended RRP couplers. Let me know if you want them View attachment 419598
View attachment 419599

Those are Cold Fusion coupler for a Rickter.

 

[SexPanther]

I would see if Robin at RHAAS has a solution.

 

[te4250]

My eme had an extension from driveshaft to coupler, to me that seems easiest, if you need one turned lmk I could probably squeak one out sometime in the near future. I bought the tap to make a different one for my eme but I want to say that mines m18 not 20

 

[smokeysevin]

My offer is still open to check the other the other kawi shafts I have but I need to know lengths to compare...

Sean

 

[WFO Speedracer]

My offer is still open to check the other the other kawi shafts I have but I need to know lengths to compare...

Sean

I have a stack of them too the issue is the location of the built up part that goes through the thru hull bearing varies from shaft the shaft so it's not just driveshaft length you have to keep in consideration. SXR 800 driveshaft is already 27 1/8", I believe the only shaft longer than that is in a X2

 

[smokeysevin]

I have a stack of them too the issue is the location of the built up part that goes through the thru hull bearing varies from shaft the shaft so it's not just driveshaft length you have to keep in consideration.

No doubt, it seems like the solution since we would be going longer (closer to the engine) would be to just add a spacer between the thru hull mount plate and bearing assembly.

Everything still seals up properly on the shaft and hull.

A 1" aluminum plate and some longer bolts is way cheaper than a custom shaft or coupler.

Sean

 

[yamanube]

No doubt, it seems like the solution since we would be going longer (closer to the engine) would be to just add a spacer between the thru hull mount plate and bearing assembly.

Everything still seals up properly on the shaft and hull.

A 1" aluminum plate and some longer bolts is way cheaper than a custom shaft or coupler.

Sean

I don't have any 1" aluminum nor do I have the tools to properly build a bearing housing spacer.

 

[smokeysevin]

Fair point. Carry on.

I saw on Rhaas's website that there is apparently a 1/2" spacer behind the thru hull on the SXR but I can't find that on the oe parts diagrams.

SXR 1100 Bearing Assembly

www.rhaasproducts.com

Has anyone come across one before?

I did find a 1/2" one on ebay for ~$30

Kawasaki SXR 800 / 1100 Conversation Parts - Bearing Spacer | eBay

Waterjetted and machined, mill finish, 1/2" thick alum plate, drive shaft bearing housing spacer utilized in a Kawasaki SXR 1100 conversion so the bearing seat location on the new drive shaft align with the location of the bearing housing.

www.ebay.com

Sean

 

[WFO Speedracer]

Fair point. Carry on.

I saw on Rhaas's website that there is apparently a 1/2" spacer behind the thru hull on the SXR but I can't find that on the oe parts diagrams.

SXR 1100 Bearing Assembly

www.rhaasproducts.com

Has anyone come across one before?

I did find a 1/2" one on ebay for ~$30

Kawasaki SXR 800 / 1100 Conversation Parts - Bearing Spacer | eBay

Waterjetted and machined, mill finish, 1/2" thick alum plate, drive shaft bearing housing spacer utilized in a Kawasaki SXR 1100 conversion so the bearing seat location on the new drive shaft align with the location of the bearing housing.

www.ebay.com

Sean

I am assuming the pump location is fixed, so adding a spacer behind the pump you will lose engagement of the driveshaft to impeller equal to however thick the spacer is, in other words you would need a longer driveshaft

 

[smokeysevin]

You would use a longer driveshaft from a runabout in place of the sxr stock shaft. You install the shaft fully into the pump as stock, then use a spacer between the hull and thru hull bearing to ensure the bearing sealing surface on the shaft matches with the seals in the thru hull.

All of that depends on if the runabout shaft is the correct new length though.

Sean

 

[yamanube]

Fair point. Carry on.

I saw on Rhaas's website that there is apparently a 1/2" spacer behind the thru hull on the SXR but I can't find that on the oe parts diagrams.

SXR 1100 Bearing Assembly

www.rhaasproducts.com

Has anyone come across one before?

I did find a 1/2" one on ebay for ~$30

Kawasaki SXR 800 / 1100 Conversation Parts - Bearing Spacer | eBay

Waterjetted and machined, mill finish, 1/2" thick alum plate, drive shaft bearing housing spacer utilized in a Kawasaki SXR 1100 conversion so the bearing seat location on the new drive shaft align with the location of the bearing housing.

www.ebay.com

Sean

Nice find! I got excited for a minute because the X2 driveshaft is a good length for the application and probably easy to find BUT it would require a 3" spacer on the bulkhead which I have no way of making, I also have concerns about the load that spacer might put on the bulkhead.

 

[WFO Speedracer]

You would use a longer driveshaft from a runabout in place of the sxr stock shaft. You install the shaft fully into the pump as stock, then use a spacer between the hull and thru hull bearing to ensure the bearing sealing surface on the shaft matches with the seals in the thru hull.

All of that depends on if the runabout shaft is the correct new length though.

Sean

The only shaft longer is from an X2, at any rate the total length on a 550 coupler is 2 1/4" and I have one in hand

 

[fastgtfairlane]

What's the length on the sxr shaft? I wonder how a 550sx shaft would work as the splines are all the same.

 

[yamanube]

What's the length on the sxr shaft? I wonder how a 550sx shaft would work as the splines are all the same.

I'll have to find the info again, I think 28". I believe only the X2 is longer.

 

[fastgtfairlane]

I looked and found the sxr and 550sx shaft lengths. Overall length is 28" for both.
Sxr from coupler to front of bearing surface is 8.5" rear 10.5"
550sx is 6.75" rear 8.75"

Not sure that will help you.