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Old 09 June 2013, 17:41   #11
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Sounds like work carbon brushes. Had a similar issue with my Tohatsu. Change rubber 'o' rings as a matter of course. Motor housing looks particularly corroded - would be worth treating that while you're sorting it.
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Old 09 June 2013, 19:25   #12
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Sounds like work carbon brushes. Had a similar issue with my Tohatsu. Change rubber 'o' rings as a matter of course. Motor housing looks particularly corroded - would be worth treating that while you're sorting it.
Had a very similar problem with my yam 100 - see an earlier thread and photo. Turned out it was the tilt motor housing corroded and so the magnets were loose inside. The motor would start off tilting, then get slower and slower till it stopped. Yamaha do sell the housing alone, but it was still around 300.

If you do a search on fleabay, there is a guy in America that advertises trim motors for a very good price, but you would need to be able to wait for it to arrive.
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Old 10 June 2013, 05:16   #13
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Had this problem with my 40hp Yam, the motor had corroded and the magnets were loose, stripped it and cleaned the inside of the housing araldited the magnets back replaced the brushes and screws for the brush holders. The brushes I cut down from some on a starter motor that were slightly bigger, cleaned the commutator and used RTV for rebuilding .All working fine again.
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Old 10 June 2013, 05:25   #14
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Quote:
Originally Posted by Bucksribster View Post
Had a very similar problem with my yam 100 - see an earlier thread and photo. Turned out it was the tilt motor housing corroded and so the magnets were loose inside. The motor would start off tilting, then get slower and slower till it stopped. Yamaha do sell the housing alone, but it was still around 300.

If you do a search on fleabay, there is a guy in America that advertises trim motors for a very good price, but you would need to be able to wait for it to arrive.
I'm sure it can be repaired. Unless the armature is damaged or the magnets (housing) are loose it can be done. I've done the same job myself with a Tohatsu. They don't sell the carbon brush kits anymore - but I repaired it with brushes for a Honda CBR125 and a spring from Meccano!

Original thread here: Twatsoo 60hp won't fire up
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Old 10 June 2013, 13:26   #15
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I'm sure it can be repaired. Unless the armature is damaged or the magnets (housing) are loose it can be done. I've done the same job myself with a Tohatsu. They don't sell the carbon brush kits anymore - but I repaired it with brushes for a Honda CBR125 and a spring from Meccano!

Original thread here: Twatsoo 60hp won't fire up
In my case, not only were the magnets loose, but the housing was completely corroded through Surprising it worked at all, as it must have been full of water.
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Old 10 June 2013, 13:36   #16
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In my case, not only were the magnets loose, but the housing was completely corroded through Surprising it worked at all, as it must have been full of water.
hmmmmm..... i would agree, that does look a like a touch of corrosion, better to fix it on the bench than get stuck out on the wet stuff
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Old 11 June 2013, 06:04   #17
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Yamaha tilt and trim problem

Well thanks to you all. After looking over everything you have all posted and faced with the cost of a new motor, I finally got up the courage to take the motor off and go in to it, as you can see it was bad but not as bad as it could have been, but how it was still running on and off I do not know. Got it off and apart, tipped out the water and got on with cleaning it. Spent a bit of time on the inside and outside, got it back together, gave it a paint and wow what a difference, its now spinning like a new one! Thanks everyone for your help.
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Old 11 June 2013, 06:18   #18
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Well thanks to you all. After looking over everything you have all posted and faced with the cost of a new motor, I finally got up the courage to take the motor off and go in to it, as you can see it was bad but not as bad as it could have been, but how it was still running on and off I do not know. Got it off and apart, tipped out the water and got on with cleaning it. Spent a bit of time on the inside and outside, got it back together, gave it a paint and wow what a difference, its now spinning like a new one! Thanks everyone for your help.
sometimes the hardest part of a job is getting started, well done for sorting it out least now you've got time to keep an eye on ebay etc to see if one comes up cheap you can keep as a spare
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Old 11 June 2013, 06:52   #19
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V useful post and good pics. I think this is going to be coming round for me soon. Hopefully it'll keep going til the end of the season but the housing on my motor is as corroded as yours, and as previously posted I think the seals are leaking slightly too so I'll probably be looking at an overhaul in the off season.
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Old 11 June 2013, 08:23   #20
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Corrosion... wow it looks like the German Dornier they've just lifted out of the English Channel!

Glad you got it fixed!
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