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Max Online: 36273 @ 01/23/13 02:34 PM
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#11324793 - 01/05/16 02:54 PM 25 Yamaha not turning enough RPMs (not the prop)
StumpJumper1 Offline
TFF Team Angler

Registered: 04/14/08
Posts: 3994
Loc: CenTex
I'm starting to get frustrated...

2000 25 Yamaha four stroke. I'm only getting about 3000 RPMs off of either plug wire, this prop should be getting almost twice that. The motor starts, idles, and runs smooth.

I just had it in the shop and they found a broken magnet on the flywheel that was causing a knock and cylinder not to fire. That was a $750 fix, but it's still knocking and not turning enough RPMs.

Here's a list of everything I've done so far:
New flywheel
New oil and filter
De-carbonized the motor
New lower unit oil
New fuel filter
New water separator filter
New gas with stabil and ring free
New thermostat (old one was stuck open)
New fuel pump
New belt and set the timing
Checked the valve clearance (only one exhaust valve was just a little off)
New plugs (gapped properly)

Literally the only thing I haven't done is rebuild the carb, only because I'm still waiting on the kit. I checked the throttle cable and the carb is wide open when the cable is maxed out. But I seriously doubt it's a carb issue, otherwise it wouldn't start idle and run so smooth. It has to be an ignition issue, right? Think the stator got damaged from the broken magnet? Ideas, thoughts?


Edited by StumpJumper1 (01/05/16 02:57 PM)
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#11325088 - 01/05/16 04:55 PM Re: 25 Yamaha not turning enough RPMs (not the prop) [Re: StumpJumper1]
03svtsnakevert Online   content
Extreme Angler

Registered: 04/05/12
Posts: 2614
Loc: Copperas Cove, TX
Sounds like it's not getting to full timing advance
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#11325258 - 01/05/16 06:36 PM Re: 25 Yamaha not turning enough RPMs (not the prop) [Re: StumpJumper1]
StumpJumper1 Offline
TFF Team Angler

Registered: 04/14/08
Posts: 3994
Loc: CenTex

Hell it might be this piece of junk tach that I have. It's all over the place now. I'll buy a better one.

And the clicking I was hearing was when I had the fuel line disconnected and running the carb outta fuel.

So maybe I overreacted but it's still not running very fast (25 mph on a 1542 alumacraft) and now I don't have a clue what rpm I'm turning. Maybe I should just rebuild the carb and call it good.
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#11336749 - 01/10/16 04:09 PM Re: 25 Yamaha not turning enough RPMs (not the prop) [Re: StumpJumper1]
leanin post Offline
TFF Celebrity

Registered: 08/18/09
Posts: 5937
Loc: TEXAS
its likely fine. the 4 strokes will never have the balls 2 strokes do no matter how hard they try.
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