Speedometer

[moderation]

My 150hp Yamaha speedometer is intermittent. It will work for a day or half a day and then quit. I’ve checked what I think is the pickup on the motor and it seems clear. The motor has a total of 8 1/2 hours so I don’t think It could have much crud, plus I have been in fairly clean water lakes

so other than surface crud or bloom I don’t know what have gotten Into the pickup holes. And again it is intermittent, at least for the last few days of operation.

I would also like to know exactly where the speedometer hole is located, the owners manual doesn’t show it and there are three holes below the cavitation plate. This is a 2006 model. By the way, my dealer is not much of a help and I will only go back if necessary.

[marine_man]

Check out this thread:

Speedometer Problems

The quickest way to find out which one is the spedometer hole (there are 3 holes on the leading edge of the lower unit?) use a little air pressure in each hole until you can see your speedometer needle moving.

Are you getting no reading at all intermitently, some reading, but way off, or what?

marine_man

[moderation]

When it works it seems to be maybe 5-8 mph different than my locator speed. When it doesn’t work it does not register at all, stays on 0. Kind of hard to figure when it is intermittent. There are no holes on the leading edge all the

holes are on the sides.

[marine_man]

If there aren't any holes in the leading edge of the lower unit then you must have a spedometer pick up mounted somewhere on your transom. You should be able to follow the speedometer hose to the pickup, where ever it is.

I'm pretty sure your motor has the pickup built into the motor though... look for a really tiny hole on the leading edge (forward edge) of the motor, somewher below the cavitation plate. The hole is real small, and if you view the motor from the side would look a little like a half moon notch cutout of your lower unit.

Find that first and use compressed air to actuate the speedometer. If your speedometer worked when you first got it I'm guessing something got stuck in the pickup.

marine_man