Left case primary mod question

Bottom End (crankcases and crankshaft)
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ogoki
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Left case primary mod question

#1

Post by ogoki »

Hey guys,

I'm just having a look at some of the repairs that will need to be done to my cases, and I'm wondering if I could get some opinions about this. The lip where the primary would bolt to the left case seems to have been milled down.
Pan Cases Primary Mod.jpg
Would this have been done to run an electric start primary? And is this something that should be addressed if I want to run an early pan primary, or could it be run as is?

Thanks for any responses.
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58flh
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Re: Left case primary mod question

#2

Post by 58flh »

Oki----It can be run as is.Just use the gasket between the inner primary & you should be fine.Whatever was taken off is minimal & you should have no problem with interference from compensater.-----Respectfully----Richie
RUBONE
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Re: Left case primary mod question

#3

Post by RUBONE »

Without the lip the only thing that centers and aligns the inner primary is the bolts holding it on. It won't be an issue if they are kept tight. I would also use a reinforcing ring on it for support.
ogoki
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Re: Left case primary mod question

#4

Post by ogoki »

I appreciate the responses, guys.

Rubone - What exactly do you mean by a reinforcing ring? Just something to take the place of that lip?
Bigincher
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Re: Left case primary mod question

#5

Post by Bigincher »

The reinforcing ring is part of the fastener package. Check the parts books, there are two styles, early and late. All primary covers should be mounted using the reinforcing ring, or the later style 'butterflies'. But I'll bet the majority are put together without them.
ogoki
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Re: Left case primary mod question

#6

Post by ogoki »

Copy that. Thanks.
Bigincher
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Re: Left case primary mod question

#7

Post by Bigincher »

Oh, I didn't want to steer you wrong when I said most bikes don't have the reinforcing ring.
With the engine case you showed, you have to listen to Robbie- for sure you want the reinforcing ring.
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