Opinions on these "custom-50m-metering-rods"

[GSP7]

'79 and later with.036 tip... My carb is 17080213

https://cliffshighperformance.com/product/custom-50m-metering-rods

Compared to the standard original 50m(etc) primary rod with .036 tip. with the dual taper/step

Im wondering, all things being equal, if these "custom" straight taper primary rods would need a larger jet to  run the same as the original dual taper with same size jet. Especially at off idle tip in.

Im wondering if I remove my Custom 50m rods and install my original dual taper 50m it would be richer off idle acceleration , all things being equal


.

[novadude]

I thought all OEM "M" rods had a smooth taper to the tip and no "step" like K rods, etc?

[GSP7]

No step, but the original rods had a "dual" taper near the tip.

[Kenth]

M4 rods w/suffix J are equivalent of early no-letter rods.
M4 rods w/suffix K are single taper and step to .026".
M4 rods w/suffix L are equivalent of 4M "B" rods.
M4 rods w/suffix M are single taper and step to .036".
M4 rods w/suffix P are single taper (steeper than K rods) and step to .026".
M4 rods w/suffix S are smooth single taper to .036".

[novadude]

Thanks for this, Kenth!

[GSP7]

M4 rods w/suffix J are equivalent of early no-letter rods.
M4 rods w/suffix K are single taper and step to .026".
M4 rods w/suffix L are equivalent of 4M "B" rods.
M4 rods w/suffix M are single taper and step to .036".
M4 rods w/suffix P are single taper (steeper than K rods) and step to .026".
M4 rods w/suffix S are smooth single taper to .036".

That's a moot point, and irrelevant to the original question posted

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[Kenth]

That's a moot point, and irrelevant to the original question posted

I posted this info only for "food for thought".

If you think about it a little, if you modify a 50 M rod and remove material to eliminate the step towards .036", it will be richer at the same APT setting.
Hope this answer is useful.

[novadude]

I measured a 50M rod out of curiosity.  It looks like the taper goes all the way from 0.050" to 0.038-0.039, and there is only a small step to 0.036".  Does this sound right?  If so, I wouldn't think there would be any major difference between a 50M rod and a custom rod that tapers all the way to 0.036".  As Kenth said, the taper will be steeper, so it will be slightly richer at every point along the taper, but not by any significant amount, IMO.