monty motor

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gordonmichaellee
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monty motor

Postby gordonmichaellee » Tue Aug 12, 2008 7:49 pm

my montesa 315r has developed a noise , its not the flywheel I've checked, but it
sounds like it, also at about the same time it seems to be a bit low on power. I've cleaned the exaust completely, changed spark plugs, new fuel. non of it makes any difference. I wondered if it might be the reed. At the same time a noise comes out of the exaust, not quite a backfire but a signifigant ammount more volume than normal. If I put my hand over the exaust I can feel it.
the loss of power is sometimes worse than others. sometimes 60% good give it a hard rev and it comes goodish.other times its at about 90%.
My thought are
1 piston/rings
2 reed valve
3 fuel/carb problem
4 exaust

any feed back would be most appreciated.

cheers Gordon



David Lahey
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Re: monty motor

Postby David Lahey » Tue Aug 12, 2008 8:50 pm

The symptoms sound like a ring sticking in its groove.
You have eliminated most of the other possible causes and a reed problem won't go away with a rev out.


relax, nothing is under control

gordonmichaellee
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Re: monty motor

Postby gordonmichaellee » Tue Aug 12, 2008 10:08 pm

I should point out the knocking noise does not go away with a rev out.



sharvie
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Re: monty motor

Postby sharvie » Wed Aug 13, 2008 6:52 am

You could try De-carboning the piston, its not a huge job & won't cost you any $.

Just drain the coolant, whip the head off, move the piston to Top Dead Centre. Brake cleaner seems to disolve the carbon well. Spray some onto a rag so you dont get muck running down the clyinder

Steve


Sharvie ~ Maitland NSW

gordonmichaellee
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Posts: 92
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Location: Byron Bay

Re: monty motor

Postby gordonmichaellee » Wed Aug 13, 2008 8:04 am

thanks sharvie I'll try that this weekend. I'll let you know hw I get on.




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