BK letters on flywheels

Anyone seen this before? Standard hd pistons.valves springs etc. So didn't think this had been apart before. Regards B.B.

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bangkokbob
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BK letters on flywheels

#1

Post by bangkokbob » Tue Oct 29, 2019 8:04 am

Resized_20191029_114254_6028.jpeg
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Re: BK letters on flywheels

#2

Post by George Greer » Tue Oct 29, 2019 9:12 am

Mechanic or inspectors stamp??

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Re: BK letters on flywheels

#3

Post by RooDog » Tue Oct 29, 2019 12:18 pm

B ang K oc K bo B ? ? ? ?
....RooDog...

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Re: BK letters on flywheels

#4

Post by 1950Panhead » Tue Oct 29, 2019 1:15 pm

Not factory, likely an engine builders initials or previous owner initials.

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Re: BK letters on flywheels

#5

Post by Lowbikemike » Tue Oct 29, 2019 1:55 pm

My knuckle engine has the previous owners name stamped in the side of the flywheel.

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Re: BK letters on flywheels

#6

Post by hydra74 » Tue Oct 29, 2019 2:27 pm

my '55 has the BK stamps too

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Re: BK letters on flywheels

#7

Post by bangkokbob » Tue Oct 29, 2019 2:40 pm

That makes it interesting Hydra74.
Thank you.

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Re: BK letters on flywheels

#8

Post by Buddhahoodvatoloco » Tue Oct 29, 2019 2:58 pm

Ummmmmmmmmmmmm, :lol: :lol: :lol: :lol:
bangkokbob wrote:
Tue Oct 29, 2019 2:40 pm
That makes it interesting Hydra74.
Thank you.

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Re: BK letters on flywheels

#9

Post by Andygears » Tue Oct 29, 2019 9:41 pm

Could it be a machinist or inspector stamp for the final sizing of the tapers? In Hydra’s motor B did the crank pin right side and K did the pinion shaft hole. Then O did the sprocket hole. In the other photo, K did both shaft holes.

No stamp for the non-keyed left crankpin hole?

Just guessing
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Re: BK letters on flywheels

#10

Post by Speeding Big Twin » Wed Oct 30, 2019 6:07 am

I don't know what BK represents but it’s stamped on top of two H-D Pan flywheels I have. Both have MOCASCO on them as well as an MCC logo indicating they were produced by Motor Castings Company. One has casting number 150 40 and the other casting number looks like 23923-56.
Eric

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