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Push rod length

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THEFORTHSTOOGE
Posts: 9
Joined: Sun Feb 06, 2022 11:26 pm

Push rod length

Post by THEFORTHSTOOGE »

1960 R50 fiche shows length to be 24.35mm, all 4 of mine are 24mm end to end. Why are mine shorter.
I'm changing out a damaged one.

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schrader7032
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Re: Push rod length

Post by schrader7032 »

BMW Salis fiche shows the length to be 24cm:

https://bmwclassicmotorcycles.com/index ... -5455.html

What fiche are you using that shows 24.35cm?
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.

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Flx48
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Re: Push rod length

Post by Flx48 »

Salis lists as ~24cm
Max lists as 243.5mm

Perhaps Max measured a single pushrod and Salis measured a number of them, hence the tilde?
Best-
George

THEFORTHSTOOGE
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Re: Push rod length

Post by THEFORTHSTOOGE »

Max BMW fiche is my source. Guess I'll replace them all and play dough the piston tops. Looking for .080 int and .100 ex. MIN. clearances

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wa1nca
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Re: Push rod length

Post by wa1nca »

Found this 1965 tech bulletin in the library
they went to 243.5 mm to offset for a thicker base gasket if used:
Same part #
223.pdf
(126.88 KiB) Downloaded 41 times
Last edited by wa1nca on Tue Jan 24, 2023 5:05 pm, edited 4 times in total.
Tommy Byrnes
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA

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schrader7032
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Re: Push rod length

Post by schrader7032 »

Interesting...I'm wondering who would go to the trouble of lowering the compression on an R50?? :lol: Maybe an R50S.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.

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wa1nca
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Re: Push rod length

Post by wa1nca »

yes
Not R50-R60/2
Tommy Byrnes
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA

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