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Setting fuel screw with a tachometer

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Above, 1gr8bldr mentions setting the fuel screw with a little tach with 10 rpm resolution. You want one with a replaceable battery, like this https://www.amazon.com/gp/product/B00YTXKKDQ

I finally tried the Ramz process which is reformatted here for easier reading: https://docs.google.com/document/d/1ZK0m0LUwsqjrfgbL6eQCBu4T2nkPq6eF4lB7Ch9oEes/pub#h.zgx0yw9y2uz2

The tach makes it MUCH easier to do this with precision. Maybe some can hear a 10 rpm difference, not me. The key is to wait awhile for the engine to settle after each change.

 

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My first one that read in 60 increments looked like that. Does it state that it has a 10 rpm increment?

The tach is crucial for 2 stroke because it never settles down but rather is seen almost as a range. Where the 4t is somewhat steady

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9 minutes ago, 1gr8bldr said:

My first one that read in 60 increments looked like that. Does it state that it has a 10 rpm increment?

The tach is crucial for 2 stroke because it never settles down but rather is seen almost as a range. Where the 4t is somewhat steady

Oh, just noticed you mentioned 60 rpm for yours. The instructions now state "Rpm resolution: 10 Rpm" and this is what it shows when you are watching it. The behavior I saw is consistent with the claim.

Seemed like it allowed me to dial the screw in with a precision between 1/16 and 1/8 turn. Tiny bumps had measurable effects on the tach. Does this matter? Probably not, but given the enthusiasm of this forum for details I thought I would mention it ;)

Edited by RedMesa

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21 minutes ago, RedMesa said:

Oh, just noticed you mentioned 60 rpm for yours. The instructions now state "Rpm resolution: 10 Rpm" and this is what it shows when you are watching it. The behavior I saw is consistent with the claim.

Seemed like it allowed me to dial the screw in with a precision between 1/16 and 1/8 turn. Tiny bumps had measurable effects on the tach. Does this matter? Probably not, but given the enthusiasm of this forum for details I thought I would mention it ;)

I bought another because my first one did not offer the precission I needed, but 10 rpm is great. i think my present does 20 rpm increments

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My prototype is a little rough but works so I never made another. It fits good, LOL, but not in the picture, LOL, cause I can't see that close without glasses. Keeping contact at all times makes counting turns easy. Plus you can move it quicker

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