I have an 05 Honda 90hp, never had any problem but this past weekend looked at my tach and it was reading 6000rpm. I know the prop I have on would only turn 5400 with the load I had and the motor didn't sound like it was reving too fast so I didn't think my hub was slipping and after a couple of minutes the tach seemed to work properly. Could I have some thing loose or could it be electronic?
09-03-2008, 08:41 AM
It is probably the tach itself or the sender. Bring it to a Honda dealer and have them test the motor. They should have a "boat in a box" that they can hook up to the engine a show the actual RPM's. More than likely you will need a tach.
09-03-2008, 09:21 AM
Feel the lower back side of the tach. There's a switch there that may have moved. It happens.
Your engine should idle around 600-800 rpm.
Thanks, it only happened one time so far so I'll get it in to the dealer if it happens again.
09-03-2008, 10:29 AM
I've often seen motors rev a bit higher when they pick up a weed or something else causing a little prop cavitation. Lose the weed or trim in a bit and the revs go down again. Could that be what you were seeing?
Unless the tach starts behaving strangely all the time, it is hit-and-miss whether a problem can be detected by shop-testing .
The engine wasn't over reving going by the way it sounded, it just seemed that the tach was giving a false reading.
09-04-2008, 11:16 AM
I'd check you connections to your tach to make sure they're clean and tight.
My tach was reading high I sent a e-mail to the Co. Sent back was to remove tach rotate the setting screw a few times to clean off contacts, and reset to the proper place. It took about 5 minutes to do this and my tach is perfect. Not sure you have the same problems I had but it may be worth a try.
I'm thinking it is something simple and going to try checking it out this weekend.
look for aloose connection on the motor and also on the back of the tach.
just a thought