How do you tell if you have a burnt piston?

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Dec 14, 2005 | 02:59 AM

Hawnduh400ex

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How do you tell if you have a burnt piston?

I was just wondering because my friend put racing fuel and octane booster in my STOCK 05' 400ex and now it has kind've a rattle when you hit the throttle. Anyone know what this is? It may just be a loose part but I have yet to check.

Dec 14, 2005 | 03:02 AM

Bing

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How do you tell if you have a burnt piston?

just run 87 octane

Dec 14, 2005 | 03:09 AM

Hawnduh400ex

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How do you tell if you have a burnt piston?

Well I knew that but apparently he didn't...

Dec 14, 2005 | 10:16 AM

MikeM

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How do you tell if you have a burnt piston?

octane booster will not cause a burnt piston, it just slows the burn rate down so you do not detonate

it's not leaning it out or making the burn hotter