38mm carbs

[Blue]

38mm carbs apart from spacing are the oil & water model carbs the same? Can I use a steel powerjet carb in a bank of plastic powerjet carbs? 

[Joseph]

The carburetor bodies although looking very similar are not the same in fitment/directly interchangeable.

The difference in spacing isn't only down to the spacers, there are a couple of differences in the casting of the main bodies.

It can be sorted out using a file on certain areas of the WC carbs

[Joseph]

IIRC these protrusions don't exist on OC carbs, and interfere when trying to mix and match

Edited September 2, 2025 by Joseph

[Blue]

Thanks, so is it correct that the ones with the steel pipe to rubber are oil cooled  and the plastic are water? 

Edited September 3, 2025 by Blue
Extra info

[baldrick]

These are oil cooled ones, if it helps

[Blue]

Thanks Baldrick, it would appear that both the metal ones and the plastic are oil cooled. WC didn't have the powerjets. The metal ones being the early ones.

[baldrick]

you do realise that they do nothing, without an airbox?

[Blue]

They do nothing in the uk as the jet is size 0 from factory  1 of the pilot jets is stuck & blocked so I'm looking for a no.3 body  I believe the bodies are the same except what Joseph pointed out 

Edited September 4, 2025 by Blue
Added more info