A bit of quick research in Bruce Palmers book shows that internally both carbs are identical.
There are two external differences one minor but one is a major difference.
The minor one is the throttle lever 1238-36 / 37 / 40 depending on application.
The major one is the carb mounting flange with one being 3 bolt and the other being 4 bolt.
I'll hold my hand up and say knuckles are way out of my league and what follows could prove to be wrong but here goes.
The M5 fitted to 1936-39 knuckles I suspect was a 3 bolt mount and as most part numbers for the inlet manifold change to -40 part number in my late model parts book I'm led to suspect that that is when the 4 bolt manifold started.
Robbie or some knuckle guru help me here.
The main point here with regard to Steve's bike is that I'm at a bit of a loss to understand how a 4 bolt mount carb is fitted to a 3 bolt manifold. Who knows, anything's possible
Does that answer your question kitabel
There are two external differences one minor but one is a major difference.
The minor one is the throttle lever 1238-36 / 37 / 40 depending on application.
The major one is the carb mounting flange with one being 3 bolt and the other being 4 bolt.
I'll hold my hand up and say knuckles are way out of my league and what follows could prove to be wrong but here goes.
The M5 fitted to 1936-39 knuckles I suspect was a 3 bolt mount and as most part numbers for the inlet manifold change to -40 part number in my late model parts book I'm led to suspect that that is when the 4 bolt manifold started.
Robbie or some knuckle guru help me here.
The main point here with regard to Steve's bike is that I'm at a bit of a loss to understand how a 4 bolt mount carb is fitted to a 3 bolt manifold. Who knows, anything's possible
Does that answer your question kitabel
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