Anyone know what the thread size is on the flywheel magnet for use with a puller. I'm changing my timing belt and my puller seems to only have standard thread bolts. Thanks
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150 flywheel magnet threads for puller
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are you trying to pull the flywheel or the magnets?
never heard of pulling magnets.
do you have metric bolts?
Yamaha bolts and hole threads are metric
probably need to post complete model # of your motor so others know what motor you are talking about
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Combination flywheel and rotor for the electrical generation system. On some models it also contains a harmonic balancing device.
When Japanese gets translated there is some confusion. Like what we call the hood of a car really being a bonnet. At least that is what they said on Wheeler Dealers. Fenders are really wings.
I seem to recall the bolts being 8 mm with a 1.25 mm thread pitch. Pull the flywheel and take it to Home Depot and find the metric (excuse me SI) thread size that will fit it.Last edited by boscoe99; 11-25-2016, 03:06 PM.
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I found the size. I am trying to pull the flywheel so I can replace timing belt. I am currently using a pancake compressor to power an impact on a puller. Not working , will have to wire up my big compressor. While I have everything off , I want to change the balancer as well. I don't see anything in the service manual that addresses this procedure with the power head still intact on the lower unit. Has anyone done it this way ?
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A 150 does not use a timing belt.
Perhaps you have an F150.
The service manual for a Yamaha outboard motor is severely lacking in detailed information. You would be better off following the Yamaha technical bulletin for the balancer replacement which is at
F150 Balancer Replacement Instructions
For changing the cam shaft drive belt take note not to damage the tensioner.
Timing Belt Tensioner Information
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Balancer replacement might take an hour going SLOW...
And it can be done with the boat in the water.
I watched the tech do mine under warranty, just make sure
marks are dead nuts lined up...Last edited by TownsendsFJR1300; 11-26-2016, 12:09 PM.Scott
1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR
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I had a crabber ran a few years with a shredded balancer.
when he brought it to me with a complaint of an oil alarm I asked him how long has the motor been running without sqealing.
he said it squealed for a week then quit about 11/2 years before I got it in.
cleaned the pan and replaced the strainer and cleaned the oil pressure control valve and it ran another 2 yrs with a new blancer.
it finally died with about 8500 hours on it.
most neglected F150 I ever saw that refused to die.
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Originally posted by rodbolt17 View PostI had a crabber ran a few years with a shredded balancer.
when he brought it to me with a complaint of an oil alarm I asked him how long has the motor been running without sqealing.
he said it squealed for a week then quit about 11/2 years before I got it in.
cleaned the pan and replaced the strainer and cleaned the oil pressure control valve and it ran another 2 yrs with a new blancer.
it finally died with about 8500 hours on it.
most neglected F150 I ever saw that refused to die.
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