New prop, still problems.

Lee, At a closer inspection of the prop it doesn't have a "clutch" It is just a different colored plastic that attached to the hub. You got it right on the head-it's lurching. The rpms never go up much just a little then it backs down, and repeats. I am going to replace my fuel lines and bulb tonight and inspect the internal lines and filter. I will take it to the river and go for it tommorow morning. I never thought about the fuel. That makes perfect sense. I hope it is the culprit.
 
Even if it turns out to be a fuel line problem, you should still get a Tiny Tach to check your rpms. Any marine shop will have them. They take about 5 min to install and you'll always know if you're running in the right rpm range for your motor.
Rick
 
You have to get the RIGHT tiny tach. I got one for my 98 Mariner 25 about 6 years ago and it would read at least double the rpms. If yours has electric start, I would think it would have a tach connection on the wire harness.
 
Leslie

I had a similar problem on my Yamaha 25 I thought it was the prop spinning on the rubber splined bushing so i bought a new prop, same problem. It turned out that the gear shift was out of adjustment and with a little load at about half throttle it would let the forward gear slip on the clutch dog giving the impression the prop was cavitating.I adjusted the shift setting and all was ok.
 
I do have the electric start. I have researched the tiny tachs and there is a 1 cyl and 2 cyl version. I am going by NAPA tommorow to see if they have one. Do you really just wrap the wire around the spark plug wire? The only thing that sucks about that is when the battery goes out you have to buy another.
 
They have more types than that. They have them for firing every other stroke, every stroke,four stroke 1 cyl, 2cyl, blah blah blah. Call Tiny Tach and tell them what your motor is and they can tell you the specific model you need. Yes, you wrap it around the #1 cylinders plug wire. Mine seemed to short the motor out when it got to WOT. I'd put it on and it sounded like valves floating if you know what I mean..take it off and ran fine. I tried wrapping it closer and farther away from the plug boot..no luck. I believe I just got the wrong damn one for my motor. The batteries last a LONG time..5 years or something like that and probably longer if you don't get the hour meter model.
 
I saw the hourmeter models and thought what would I need that for? Then I thought about the new lawnmower I just bought that's maintanence schedule is set up on hours and there isn't one on the motor. I have the tiny tach homepage saved and will call them tommorow before I go to NAPA.
 
Why not try putting some weight in the stern. If that doesn't work send your old prop off to be rebuilt and cupped and keep the comp as a spare.
Just my $.02 worth,
Harry
 
I got it figured out and fixed. Lee, you were right, it was the fuel line. I had a hairline crack in the fuel line just after the filter. I relocated the fuel tank to the front of the boat and put new hose, bulb and filter on. I took it out for about twenty minutes loaded some extra weight in the front to simulate my hunting partner, and off i went. I never had a minutes trouble out of the prop or the lurching. This being my first powered boat there's a lot of little things to learn. I have had it for some years now but never had any trouble till this season. Thanks guys for your time and interest in helping me find my problem. HWhitley, I do think I need to adjust some weight rearward to get the nose up a little. It was "cutting" water about 4 ft from the nose.
 
Glad you found it. Air leaks can drive ya nuts...it's usually the little o-ring where the gas line hooks up has a slight tear or a pinhole in the carb gasket. So how did the prop change work? Better holeshot?
 
First off Thanks to everyone. The new prop gave me a heck of a holeshot. I got up on top twice as fast as normal. I can tell the top end has fallen off some but I rarely ever run it WOT. I saw a fella in a new G3 coming up river on the trolling motor with his son. They were casting bobbers for panfish so I thought nothing of it. Turns out he broke the skeg on a rock bar and bent a prop blade severely. He had no choice but to troll it back. I idled past and he never said a word. I GUESS HE WAS A LITTLE EMBARRASED. I was parked at the landing talking to some friends when he pulled out. My only words to him were I'm glad to see you and him(his son) made it back. I walked ALL the way across the rock shelf with knee boots on looking for mussels to go cattin with. You got to be careful down here.
 
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