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Old 27 March 2011, 14:00   #1
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Yamaha outboard problems.

Hi all.

I have got a Thundercat with a Yamaha 2001 50hp. I ran it last week and it was fine no problems what so ever. However went out today and started fine ticked over fine let it warm up for about 5 mins. Went to give you about half throttle and the engine didn't like at all. A little bit of White smoke as no power and the engine itself looked like it wanted to rip off the boat. It was shaking like mad.

I used semi-synthetic two stoke oil last week with no problem. This week I used a cheap two Stoke oil. Would this has an effect??? Or is it the spark plugs???

Please help.

Should I change the plugs after every outing and what's the best oil to use.

Thanks in advance.

Neil
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Old 27 March 2011, 14:30   #2
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Originally Posted by Neil Smart. View Post
Hi all.

I have got a Thundercat with a Yamaha 2001 50hp. I ran it last week and it was fine no problems what so ever. However went out today and started fine ticked over fine let it warm up for about 5 mins. Went to give you about half throttle and the engine didn't like at all. A little bit of White smoke as no power and the engine itself looked like it wanted to rip off the boat. It was shaking like mad.

I used semi-synthetic two stoke oil last week with no problem. This week I used a cheap two Stoke oil. Would this has an effect??? Or is it the spark plugs???

Please help.

Should I change the plugs after every outing and what's the best oil to use.

Thanks in advance.

Neil
Are you using marine 2 stroke oil? You shouldn't be using the oil you get for chainsaws etc as the engines run at different temperatures to outboards. Look for a TWC-3 oil grade. If your uncertain redline outboards are local to you, they'll sort you out with the right stuff.

Doubt its the plugs, you shouldn't have to change the plugs after every outing, with an engine running nicely and under normal use changing them annually should be enough.

White smoke generally = steam, which could be a result of overheating from lack of lubrication.

Is the engine Pre-mix or injected?
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Old 27 March 2011, 14:48   #3
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Thanks you so much. No I was not use marine oil. I will get some asap. Thanks again.

Does redline do servicing repairs etc.
I am looking for somewhere to do my servicing etc.

Thanks

Neil
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Old 27 March 2011, 14:49   #4
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Sorry it's pre-mix. (I put the oil in the petrol first).
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Old 27 March 2011, 14:58   #5
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Thanks you so much. No I was not use marine oil. I will get some asap. Thanks again.

Does redline do servicing repairs etc.
I am looking for somewhere to do my servicing etc.

Thanks

Neil
Get the engine checked over by an engineer before using it again!!

Redline do servicing and repairs.

Alternativly; www.avon-boating.co.uk/outboard-centre who are about an hour away from Oxford (I do work for these guys, so apologies if it breaks the commercial posting rules)
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Old 27 March 2011, 17:24   #6
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Seconded-get it into Mike at Redline. I'll recommend him too.
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Old 29 March 2011, 17:17   #7
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Originally Posted by Neil Smart. View Post
Hi all.

I have got a Thundercat with a Yamaha 2001 50hp. I ran it last week and it was fine no problems what so ever. However went out today and started fine ticked over fine let it warm up for about 5 mins. Went to give you about half throttle and the engine didn't like at all. A little bit of White smoke as no power and the engine itself looked like it wanted to rip off the boat. It was shaking like mad.

I used semi-synthetic two stoke oil last week with no problem. This week I used a cheap two Stoke oil. Would this has an effect??? Or is it the spark plugs???

Please help.

Should I change the plugs after every outing and what's the best oil to use.

Thanks in advance.

Neil
Always use manufactures own branded oil... It will overheat and seize with cheap oil!

You will need to get a compression test done to see for any damage.
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Old 13 February 2013, 06:01   #8
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[QUOTE=MOS;394744]Always use manufactures own branded oil... It will overheat and seize with cheap oil!

You will need to get a compression test done to see for any damage.[/QUOTE






Hey mate what did you do to get this fixed in the end. Think I am having the same issue. Cheers
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Old 13 February 2013, 11:56   #9
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Did you run the engine with same oil last week, if so at which throttle setting ? Could have already overheated pistons and rings & general damage to cylinder walls and rotating internal parts. A friend of mine by mistake used 4 strokes motorcycle oil on his 2 strokes and engine was severely seized and ruined, bad music!! Both oil containers were same color..

Happy Boating
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