Vestigial parts

tompkins

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Nov 19, 2024
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Looking for a list of vestigial parts in a 1970 t120 build. Didn’t get a lot of response on the other board, and since nortoneers are more accepting of improvements, figured I’d ask here…. Lotsa stuff in a 650 triumph that looks vestigial to me, i.e. could be left out… examples I thought of

Sludge trap (gotta keep the plug, ditch the sludge tube, cartridge oil filter kit)

Weird chain oiler thingamabob in primary

Primary crank oil seal? 70 has the 3 lil holes drilled into the primary, effectively un-sealing it anyway…

Transmission main shaft bearing oil seal? New bearing came sealed on the one side…

Two obnoxious flat head screws in crank cases around pushrod tubes? I heard they were deleted at some point further down the line but I might have made this one up…

Oil pressure release valve?

Ok I put that last one up just to see if you were still paying attention. But seriously though- what can be or is better left out? My commando has all the trick mods- enlighten me on this 650 lump!
 
I’ll comment on a couple of your points:

Sludge trap (gotta keep the plug, ditch the sludge tube, cartridge oil filter kit)…
Kinda controversial, but has been done before. Crank will need re balancing.

Weird chain oiler thingamabob in primary…
Yes. Was defeated by the factory later.

Primary crank oil seal…
Yes, this oil seal was deleted on later models that breathed through the bearing. But some like a dry primary for a belt, or a separate primary to run ATF.

Two obnoxious flat head screws in crank cases around pushrod tubes…
Yes, these can be left out altogether without any issue.
 
You got twenty replies.

Kinda… in a week it turned into a ‘what is a sludge tube’ thread and I couldn’t tell what the heck the Aussie guy was on about. Couple hours on a Norton forum and I got actual answers…
 
I’ll comment on a couple of your points:

Sludge trap (gotta keep the plug, ditch the sludge tube, cartridge oil filter kit)…
Kinda controversial, but has been done before. Crank will need re balancing.

Weird chain oiler thingamabob in primary…
Yes. Was defeated by the factory later.

Primary crank oil seal…
Yes, this oil seal was deleted on later models that breathed through the bearing. But some like a dry primary for a belt, or a separate primary to run ATF.

Two obnoxious flat head screws in crank cases around pushrod tubes…
Yes, these can be left out altogether without any issue.
Thanks for the reply! I kinda thought some of this stuff was redundant.
 
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