Custom/Hybrid Coupler spacing HELP!!!

[js/sj]

When i had my midshaft pressed for a smaller shaft for my BOB it is supposed to stick out 20mm on the pump side of the shaft. It is professionally done and i measured with a caliper and its dead on.. But there is a good half inch between the two coupler's. The motor is back as far as it can go. Is this alright or should i go get it repressed?

 

[Freakrider]

Add two oem spacer washers to mid-s coupler.

 

[js/sj]

Add two oem spacer washers to mid-s coupler.

Thanks. that means im going to have to take the whole ski apart again. :/ can i ride it for now (a couple days) or is it really bad for it.

 

[Freakrider]

It is better to add spacer washers than to lose spline overlap imo. You can run a quarter inch gap without problems I have.

 

[js/sj]

It is better to add spacer washers than to lose spline overlap imo. You can run a quarter inch gap without problems I have.

but its half inch, not quarter. is it alrite for a testride.

 

[Freakrider]

It will prolly be okay for a test ride. quarter inch gap is after the spacers.

 

[Freakrider]

I have also run a quarter inch gap on a blaster which has more load on driveline.

 

[g-ski]

Add two oem spacer washers to mid-s coupler.

Here I go showing my inexperience. Could you explain further? Where do the washers go? Between midshaft and coupler I'm guessing? Where would you get the washers? Any pictures to clarify? Thanks.

 

[matth113]

Washers go in Coupler before its screwed on.

 

[g-ski]

Any washer that fits works or are there ones just for this? I may answer my self when I take it apart tomorrow. The coupler on the motor is standard thread; is MS std. or rev?

 

[IS0LD0UT]

I believe the washers he is referring to are from the oem pump between the prop and the pump bearings. If that is true, jetmaniac is your source.
I run mine with about a 1/4 in gap.

 

[yamanube]

I believe the washers he is referring to are from the oem pump between the prop and the pump bearings. If that is true, jetmaniac is your source.
I run mine with about a 1/4 in gap.

No, that will move your prop away from your stator veins but has nothing to do with the coupler.

 

[IS0LD0UT]

No, that will move your prop away from your stator veins but has nothing to do with the coupler.

Sorry what I was saying is that I thought those washers could also be used as spacers for the couplers.

 

[Freakrider]

OE thick washer behind coupler check parts diagrams...

 

[sjetrider]

you can also put it on motor side if its easier for you to access, 1/4" gap is ok with limmitted power setup . You just need to find a 1/4" thick washer with that big of an OD or make one.

 

[Freakrider]

http://216.37.204.203/yamaha_OEM/YamahaPWC.asp?Type=13&A=89&B=4

part # 21... use two of them, they are thick....


side note: oem crank $1,081 at Riva, that's just wrong...

 

[augustaf]

It's not easy to remove the coupler from the mid shaft while installed (heat, pipe wrench). Should js/sj remove the mid shaft, he could have it "repressed". An easier way might be to elongate the holes in the bed plates. Done that often enough. You certainly don't want more than 1/4" between couplers- hard on the rubber insert.

 

[motozachl]

Too much gap? Can I put the spacers on the engine side of the coupler?

 

[JetManiac]

Too much gap? Can I put the spacers on the engine side of the coupler?
View attachment 176539

It looks a little too far apart. Oem spec is 3-4mm between couplers.

You can wallow out/elongate the bedplate holes to move motor back or add another oem midshaft coupler washer.

I dont think washer for engine side coupler is readily available?