gone_postal
Regular Contributor
"Okay, boat & motor are 11
"Okay, boat & motor are 11yrs old. The original tach would only rev to 1400 or so. My mechanic said it was likely the tach itself, b/c it appeared to be getting the signal from the motor (I believe he said rectifier / regulator sends the signal).
So, I headed to Ebay and found an identical tach from a surplus store. I installed it and it too is only reading 1400-ish. It is accurate at idle and if I slowly accelerate - I've almost gotten it to 2000rpm, but nothing above that - it drops to 0. If I'm idling and gun it, it drops to 0.
So, is it likely my rectifier / regulator? Is it possible for the signal to drop off like that? What exactly is it? If so, could it also be doing some harm to the motor? The motor has plenty of punch, but definitely isn't as fast as it use to be - before my rebuild I could do 42mph w/ just me & 1/4 tank of gas. After rebuild & break-in I did 38mph w/ me & a friend and a full tank. The other day I could only do 34mph w/ me and 1/2 tank. (compression is fine - 122, 125, 130, 130)"
"Okay, boat & motor are 11yrs old. The original tach would only rev to 1400 or so. My mechanic said it was likely the tach itself, b/c it appeared to be getting the signal from the motor (I believe he said rectifier / regulator sends the signal).
So, I headed to Ebay and found an identical tach from a surplus store. I installed it and it too is only reading 1400-ish. It is accurate at idle and if I slowly accelerate - I've almost gotten it to 2000rpm, but nothing above that - it drops to 0. If I'm idling and gun it, it drops to 0.
So, is it likely my rectifier / regulator? Is it possible for the signal to drop off like that? What exactly is it? If so, could it also be doing some harm to the motor? The motor has plenty of punch, but definitely isn't as fast as it use to be - before my rebuild I could do 42mph w/ just me & 1/4 tank of gas. After rebuild & break-in I did 38mph w/ me & a friend and a full tank. The other day I could only do 34mph w/ me and 1/2 tank. (compression is fine - 122, 125, 130, 130)"