Zen or RCMK wrist pin bearing?

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15 years 8 months ago #14505 by Mercury94
Zen or RCMK wrist pin bearing? was created by Mercury94
I have a new wrist pin bearing that I put in my parts box about a year ago. I want to put it in my winter Zen project but it could be a RCMK bearing. The cage OD is .870mm and the needles are .560mm (hard to measure needles while in cage). I am using Zen piston,pin,and washers. Is this a Zen or RCMK bearing? :unsure:

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  • Scott
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  • Devoted Enthusiast ... MGB Technical advisor
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15 years 8 months ago - 15 years 8 months ago #14506 by Scott
Replied by Scott on topic Re: Zen or RCMK wrist pin bearing?
Measuring CAGES total width ....

A Zenoah WPB is @ .344" or 8.74mm

A RCMK WPB is @ .380" or 9.65mm

BOTH bearings are same O.D. and I.D. spec fitting the same rod I.D and piston pin O.D. Individual needle length and cage length is only difference.
2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
Last edit: 15 years 8 months ago by Scott.

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15 years 8 months ago #14514 by Mercury94
Replied by Mercury94 on topic Re: Zen or RCMK wrist pin bearing?
Thanks Scott. The bearing I have is 8.74mm long. Went to work this morning and got my good calipers. The ones I used last night are now in the scrap box. Nothing worse than a tool that does not work correctly!

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