Wrist pin bearings RAD crank

[Blaine Mac]

hey I have a +5mm RAD crank I've had for years, I just ordered a set of Yamaha wrist pin bearings for it and they don't fit, so I thought I'll try a set of 750 kawi bearings, since I had some, and they also don't fit, I was under the impression that this crank used Yamaha rods on it, can anyone help me out on this? The rods are marked (82m)
Thanks Blaine

 

[Ducky]

Not that I know, but maybe post up any markings that are on the rod. That might help people. Also, when you tried the kawi 750 bearings, did you use Big pin or Small pin bearings?

 

[Blaine Mac]

I think the rods are stock Yamaha snowmobile rods? Maybe it is an old crank I bought it off a local racer probably 16 years ago and it didn't have a hardly any hours on it, I ran it for maybe 3 seasons then got out of jet skiing, now I'm trying to put it back together , 82m is a 500 vmax prefix I think

 

[Blaine Mac]

Sorry, I missed that small pin, 20mm kawi bearings.... They would fit if I pressed them in, but that's not exactly the fit I'm looking for its is so close I wish I still had access to a sunnen pin hone.....

 

[MTRHEAD]

Here is a 20mm 62t pin and Superjet oem 20mm bearing in a 82m rod on a Superjet crank

Fits perfect!

Yes 82m is the sled rod. It also has the widest beam of all Yamaha 125mm rods. Thus RAD and race cranks used them extensively.

 

[Harbor]

Fwiw My 8mil Rad
Used Weisco Kawi Pistons 813M08500

That piston uses a 20.00mm upper pin

 

[Blaine Mac]

Here is a 20mm 62t pin and Superjet oem 20mm bearing in a 82m rod on a Superjet crank

Fits perfect!

Yes 82m is the sled rod. It also has the widest beam of all Yamaha 125mm rods. Thus RAD and race cranks used them extensively.

Fits in kawi rod....... Original bearing and the new bearing I ordered.....not fitting in superjet crank
I'm assuming that's the original part number on the bag in the pic?

 

[MTRHEAD]

YES - is that a NON OEM bearing? OEM Yamaha bearings, pins, will fit the 82m rod.

 

[Blaine Mac]

Yeah I ordered a bunch of stuff from Jetmaniac and had him throw them in, I think they are wsm, definitely don't fit. I need to order some stuff here from a local supplier anyway so I'll grab a set of wiseco bearings, if that doesn't work I'll go oem, but dealers around here are few and far between.
Thank you so much for helping me out on this,
Blaine

 

[augustaf]

The op might consider that the pin hole in the rod is no longer round. Seen it happen on a stroker crank recently (not a Rad)

 

[Blaine Mac]

thanks oem yamaha bearings fixed it though. sorry i should have updated that