70 tach

farmboy1215 · Nov 14, 2018

Recently moved my 70 gas from NC to PA. I noticed when I started it, the tach is running about 200 rpms higher than what it did before, but the engine is running at the same speed. Is my tach shot? Thanks all!

buickanddeere · Nov 14, 2018

I was going to suggest a different time zone or daylight saving time affecting the reading .
The actual place to start would be using a laser tachometer and a strip of white tape on the pulley to know the actual rpm.

StrikeForce · Nov 14, 2018

I am curious to follow this as well. I purchased a JD 70 earlier this year and the tach cable was broken. I purchased a replacement cable but when installed it looks like it is running about 200 rpm faster than my timing light "tach" function. I was wondering if a small spacer would make any difference.

Merton Canady · Nov 15, 2018

Find you a Hand held tach and check it. I have one and I use it often.

StrikeForce · Nov 17, 2018

(quoted from post at 09:12:05 11/15/18) Find you a Hand held tach and check it. I have one and I use it often.

I think the follow up question may be, is there a way to adjust it if it is found to be off? I've confirmed mine is off but would like to tweek it a bit.

70 tach

farmboy1215

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buickanddeere

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StrikeForce

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Merton Canady

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StrikeForce

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