31k/LC2 Swinging Arm question

[G]

Hi

I'm refurbing a 31m swinging arm for a project and wondered whether its possible to switch out the bushes on the main shaft pivot and replace with the bearings from and F1?

Thanks

[freddie19]

Not sure on that one mate but I know my 1985 RZ350 swingarm has needle roller bearings fitted from the factory.

It's basically the same swingarm as the 31k LC2 so there should be no real issues in getting them to fit.👍

[JonW]

Mine has needle rollers, I bought a kit from NK.

[midlifecrisisrd]

I'd think it needs a specific bearing, not just the F1 bearings

End caps, thrust washers (only on F1 type) and centre pivot tube are different

Steve

[G]

Jan 4, 2024 0:23:34 GMT 1 JonW said:

Mine has needle rollers, I bought a kit from NK.

Ok thanks I've asked Nigel

[G]

Jan 4, 2024 0:23:34 GMT 1 JonW said:

Mine has needle rollers, I bought a kit from NK.

Sadly doesn't make them any longer

[JonW]

Jan 4, 2024 17:27:51 GMT 1 G said:

Jan 4, 2024 0:23:34 GMT 1 JonW said:

Mine has needle rollers, I bought a kit from NK.

Sadly doesn't make them any longer

Ahh, thats a shame as it was a nice bit of kit.

Yambits did a needle roller kit for the LC. I fitted that to my 251LC, it wasnt great as a kit but works ok. Do they do an LC2?

[freddie19]

Been doing a bit of digging and Yambits sell the needle roller bearing kit for the RZ350.
I've never used Yambits myself but I have heard the feedback on them isn't great! 🤔

But anyway the kit comes with genuine Japanese NTN bearings as used by Yamaha. The bearing OD is 31mm so you'd have to measure the end gaps of your LC2 swingarm to see if they'd fit or not, probably need a bit of machining!

You'll also need 2 thrust washers and 2 end caps.
So you're looking at around £85 for the parts.

If that's too much work I guess you could always fit an F1/ F2 swingarm! 😁


yambits.co.uk/rz350n-swing-arm-repair-kit-p-23794.html

yambits.co.uk/rz350n-swing-arm-thrust-washer-p-167914.html

yambits.co.uk/rz350n-swing-arm-thrust-cover-p-22210.html

[G]

Jan 5, 2024 17:27:46 GMT 1 freddie19 said:

Been doing a bit of digging and Yambits sell the needle roller bearing kit for the RZ350.
I've never used Yambits myself but I have heard the feedback on them isn't great! 🤔

But anyway the kit comes with genuine Japanese NTN bearings as used by Yamaha. The bearing OD is 31mm so you'd have to measure the end gaps of your LC2 swingarm to see if they'd fit or not, probably need a bit of machining!

You'll also need 2 thrust washers and 2 end caps.
So you're looking at around £85 for the parts.

If that's too much work I guess you could always fit an F1/ F2 swingarm! 😁


yambits.co.uk/rz350n-swing-arm-repair-kit-p-23794.html

yambits.co.uk/rz350n-swing-arm-thrust-washer-p-167914.html

yambits.co.uk/rz350n-swing-arm-thrust-cover-p-22210.html

Yep I also looked into it further. Removing the old main pivot spacers with the flanges means you'd need to add 2.5mm each side to compensate if using the roller bearings. I'd decided to stick with the existing as they are in surprisingly good condition

[freddie19]

Yeah...... that's what the thrust washers and end caps are for!

[JonW]

yep, Think of it this way, the caps are 1mm thick and the thrust washers are 1.5 on both sides.

With the other kits a cut spacer/thrust was included that sat inboard to locate it and then the required distance outside. NKS version worked well.

FYI the LC yambits kit used bearings with loose needles, it wasnt a fun thing to fit cos of that. These caged units look much better.