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one for the engine guy's - 1/5/2013 12:45 AM

jvdd

Posts: 127
Score: 100
Joined: 6/27/2011
Last Login: 5/20/2013
From: Canberra, AUSTRALIA
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Hi

This is my s520 that toasted the N0. 2 cylinder.

I'm not sure what the cause was but the bigend is toast, the plug color was good and the motor was getting lots of water cooling as the cylinders were very warm to touch but you could still hold them.
I had the carbies set to 1.5L and 1H and she was running really well.

This wasn't a new motor when I got it so I'm not sure if the main damage was done then as we have only run it 3 or 4 times with the last one being a good run.

Needless to say I'm on the lookout for a new crank assembly and some pistons.

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RE: one for the engine guy's - 1/5/2013 6:34 AM

The Ghost

Posts: 1740
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Last Login: 5/21/2013
From: UlladullaNSW, AUSTRALIA
Status: online

Could be why the bloke sold it, shame about it as you said it was running really well. This is the problem with S/H engines, I had a similar problem with one I got, only it was the main bearings that seased on the crank, definitely been run excessively lean at some stage in its life.

Cheers

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RE: one for the engine guy's - 1/5/2013 6:59 PM

Ron Olson

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From: Kalamazoo, MI, USA
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I saw the thread over on The Dock and the responders gave you a lot of good advice. The engine was run too lean. It should have been another 1/2 turn out on the low-speed needle. The burn on the crank and not much of any oil burn on the piston was a dead give-away as it was oil-starved due to not getting enough oil with the lack of fuel.

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RE: one for the engine guy's - 1/6/2013 4:09 AM

jvdd

Posts: 127
Score: 100
Joined: 6/27/2011
Last Login: 5/20/2013
From: Canberra, AUSTRALIA
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thanks guy's

I ran my cat with the 520 in her today and had her set to 1.5H and 1.5L and she ran well.
I have been taking notes from the responses for the dock so when I rebuild her hopefully
I will avoid the same problem

jim

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RE: one for the engine guy's - 1/6/2013 9:23 PM

Jackal1983

Posts: 216
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Joined: 10/12/2010
Last Login: 5/7/2013
From: Preston, UNITED KINGDOM
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Put Zenoah 28.5cc Head kits on it... Make it a 570...

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