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what kind of tach do you use for small 9.8 four 4 stoke motor . it's about the only way to help set up motor. These new motor Merc, rudes , tohatsu, nission, areall made by the same company and paint is the only difference also motors are 2 inches longer with a need to build up transom.:bash
Some buy a tinytach.com tach, I bought this which is similar and only $ 13, just got it and haven't used it -http://www.amazon.com/Penny-Tachometer-Stroke-Outboard-Mercury/dp/B00ACDP6YU/ref=sr_1_5?ie=UTF8&qid=1401556117&sr=8-5&keywords=tachometer+boat I'm gonna use it to verify the accuracy of my console tach.
Unless you have a charging system on your motor you will have to use something like the Tiny Tach mentioned. I have used them and while not as good as a regular marine outboard tach they will get the job done.
X3 Tiny Tach runs off watch batteries. I strapped mine to the tiller arm with rubber bands where I could see RPM's . Wire runs from tach to one of your spark plug wires. Simple to use.
I agree with the Tiny Tach. Great device for small engines. Had mine for 5 years before I sold the boat.
I didn't even know you could get a tach for the smaller motors. Done went an learnth something new today.
If you go with a Tiny Tach make sure it is set for 1 spark per rotation. I think the default setting is that.
Now if someone will tell me why I need one I will have learned two things today .:biggrinQuote:
Originally Posted by BoarBuster
I tried my $ 13 Penny tachometer today on my Merc 60. It read pretty close to what my boat tach read.Quote:
Originally Posted by okhawg
Probably the most important thing is you can tell if you are running the right prop or not. You don't want your motor over reving or lugging.Quote:
Originally Posted by eagle 1
A tach will tell you a lot of things. First off, your engine manual will tell you the optimum rpm's for your engine, which you should never try to exceed. Then, by adjusting your prop pitch, the angle of the engine to the transom and height of the engine (ideally the cavitation plate should line up with the deepest - lowest - centerline of the transom), you can get the highest mph (use a GPS) and performance out of your rig. It's called "tricking out" your rig. That also improves fuel economy as well. Win-Win. :)
I spent a small fortune getting a 2 inch tach to work with my 30hp Merc. What a pain and there ain't much help on Google. Plus, the help is worthless help on Google.
Good luck.
just ordered that penny tack 13.27 my other one a tiny tach shot craps after 4 months
I think that 1 on the tiny tack is for 2 cycle motor while 3 is for 4 strokers at least that's what I use
Tom try I Boats with those guys are factory guys