An interesting thought

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An interesting thought

Postby funkymoped » Thu Oct 28, 2010 6:36 am

I was emailed this picture the other day asking is this right as the engine had done only 270 miles.



Now I have been told that the cause of this is lack of oil in the petrol also I learned that modern synthethic oild burn quicker and therefore lets the petrol get hot and consiquently burns a hole in the piston.

So my dear friends 30-1 on synthetic oil is a no no and I have now found a supplier of classic oils in the classic cans. 20-1 mineral oil mix and SAE 40 in the gearbox, I am assured also that 10-40 tesco oil will eventually fail.

Oh and who told me this a guy that has been building two stroke race engines for Yamaha for 30 years.
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Re: An interesting thought

Postby pertheswede » Thu Oct 28, 2010 9:14 am

Very interesting TC, I also of the belief that most of the aftermarket pistons are made of inferior grade metal composition to the original YAMAHA ones, making them less heat resistant too :? :(

How much are these old style mineral oils and where can we get them from? You or?
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Re: An interesting thought

Postby funkymoped » Thu Oct 28, 2010 7:46 pm

I have ordered some from my local bike shop today I will update when I know
what it is but you can buy a cheapo one in your local garage.
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Re: An interesting thought

Postby Charlie » Thu Oct 28, 2010 11:00 pm

Oh dear, that piston looks to me as though we are suffering a weak mixture, ie not enough fuel or lubricant, you will get the same result on mineral oil at 20:1 ratio if it runs lean, the worst thing you can have on a premix 2 stroke engine is a weak mixture :( cos this generates heat and that leads to pre combustion, generating more heat and a cheap alloy piston has a much lower melting point than a cast iron barrel ;)
Modern synthetic oil is designed for modern engines which run much tighter tolerances than old strokers from the seventies, i always use Castol TT 2 stroke oil in my bikes, thrash em to death and not once have i had a problem in nearly 30 years :)
and when i say old strokers from the seventies, i mean bikes not you TC :lol:
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Re: An interesting thought

Postby jobby » Fri Oct 29, 2010 10:25 am

can you still get castrol tt? it seems to have been replaced with tts at most places
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Re: An interesting thought

Postby Charlie » Fri Oct 29, 2010 8:18 pm

Yeh still available at most decent bike shops, i get it from autojumbles, try online :)
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Re: An interesting thought

Postby funkymoped » Mon Nov 01, 2010 7:41 am

I have ordered a load from my local bike shop should be in this week.
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