I don't use a tach, but based on my speed and prop pitch it's around 5700 rpm at wot http://continuouswave.com/cgi-bin/propcalc.pl/
I don't use a tach, but based on my speed and prop pitch it's around 5700 rpm at wot http://continuouswave.com/cgi-bin/propcalc.pl/
Those yamahas have an anti rev in neutral mechanism. You can still "give her half throttle and choke it" to start it though.
Do yourself a favor and spend the money on a Yamaha tach and problem solved...... I went thru the same crap on 2 3cyl motors before listening to someones advice. For what you are about to spend on a mechanic you can have an accurate tach made for your engine...... Like I said I have 2 of the tiny tachs laying in my tool box....
http://www.ebay.com/itm/NEW-YAMAHA-A...cd5cbc&vxp=mtr
New analog for $114
Used analog for $39
http://www.ebay.com/itm/USED-YAMAHA-...39a527&vxp=mtr
Yamaha tachs are hooked directly to the motor via harness and are triggered by cdi box and not the outside of a plug wire.
Thanks. Been searching for something smaller that I can mount inconspicuously. I don't really have a good place to mount a large analog tach like that as I stripped the boat of all the internals. Mounting a large analog like that would get torn off instantly in a duck boat by dogs, decoys, etc. Have you ever seen something smaller that could be mounted on the transom or cowling similar to the TT?
Our motors have a 1.85.1 gear ratio. I use 6% slip when working with the numbers. I know it's not perfect, but it worked great for propping my boat and it gives me a ballpark RPM average. If I had the money for some different props and a jackplate then I would definitely buy a good tach.
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