Re: Bass Tracker WOT at 7000 RPM ?
I put the tach setting at 6P and took it out yesterday. I noticed when I turned on the key it dropped from 1K to zero. From then on it stayed at zero when the key was off. When cranked it was at 11-2000rpm in neutral. If I put it in gear it dropped to 900-1000RPM. At WOT throttle it went to 57-5800RPM. It sounded good and felt right at 53-5500RPM with my wife and two kids and maybe 50 lbs of gear including the 15lb anchor. It was running at about 22-23MPH at those numbers.
I did notice after a few stop and go's that the rpm, battery and fuel gauge quit working. After turning it off and re starting the motor they would all start working again. I also noticed that sometimes the starter wants to keep spinning after it's cranked but I just made the key go back to run position...manually.
One other thing....I noticed that the motor gets a bit of a rattle sound when in between mid and 3/4 throttle then it goes away until at WOT. If I back it off WOT a bit then it smooths out and sounds good. Any ideas what that could be? I used 87 octane and added some ethanol treatment.
Thanks all for the help,
Dan
Well it looks like you got your Wacky-tacky fixed.
The service manual for my engine states that the rpm should be 675 +/- 50 idling in the water in F gear (engine loaded). Your idle numbers aren't that bad.
Moving on, it sounds to me like a bad ignition switch in the remote control. The dragging starter part of the problem could very well be dirty contacts in the switch bleeding over too. What happens on the starter is that the solenoid is still getting enough power to remain engaged (takes a lot less current to "hold" a relay as compared to energizing it) and keeping your starter engaged. Your comment about "after a few on-offs, my............" is indicative of bad switch contacts.
On the rattle and your 25mph and 5500 rpm: With your 1.64 gear box, 5500 rpm, and a 13P prop, the BAM prop slip calculator says that your non slip speed would be 41 mph. Plugging in your 25 mph says that you have a 39% slip. WAY too high indicating that either you have an instrument error (speedometer) or the prop could be slipping which could account for some of the squealing. For a reasonable (high end number for that boat) 15% slip you would be running about 35 at your 5500.
Pull your prop nut off and mark a line from the shaft (brass spline part) out to the SS prop material. Put it back together and run it hard. Pull the nut back off and check the line. If not as you marked it your hub is slipping.
Mark