Bridgestone Motorcycle Parts Discussion Board

Bridgestone Tech Talk => 350 Talk => Topic started by: moonpup on March 21, 2017, 07:27:33 PM

Title: 350 Crank Pin Size?
Post by: moonpup on March 21, 2017, 07:27:33 PM

Would anyone happen to have measurements for the 350 crank pins?  Length & diameter?

Title: Re: 350 Crank Pin Size?
Post by: moonpup on March 22, 2017, 05:29:59 PM

Update: I been informed that they are 24mm x 52.6mm.  8)

Title: Re: 350 Crank Pin Size?
Post by: bert Lilley on March 23, 2017, 10:54:45 AM

  Just Happen to have one on my Desk  :- Pin Diameter = 0.945" in Dia x 25.4 = 24mm dia. 
                                                       
                                                                  Pin Length = 2.072" x 25.4 = 52.6mm Long.

Hope this Helps  Bert

Title: Re: 350 Crank Pin Size?
Post by: moonpup on March 23, 2017, 07:55:13 PM

Thank you for the confirmation Bert..... and yes, it does help.

Title: Re: 350 Crank Pin Size?
Post by: farmerdl on March 25, 2017, 09:24:09 AM

What information is available regarding the heat treat on these pins? 

Title: Re: 350 Crank Pin Size?
Post by: OldSwartout on March 25, 2017, 12:20:42 PM

Crank pins are typical bearing journal specs, RC60-62 hardness. They can be relatively soft core, RC30-45 with either a nitrided case that will be .007-.015 deep or carburized which should provide from .020-.050 case depth. With the nitride heat treat, there's not much depth for finish grind after plus the thin case needs a harder core for support.

Title: Re: 350 Crank Pin Size?
Post by: bsracer on March 26, 2017, 03:05:50 AM

I just cut down some 175 pins to use for the crank jig and they were not soft in the center! Amazing how tough those things can be!

paul