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Old 11-24-2010, 06:08 AM   #1
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Default Charred Piston and Glow Plug

I'm running an OS VZR Version II with OS RP7 Plug and Byrons 25%. Engine is not running very lean and a fair amount of smoke is emitted when out of corners and straights. But why do I have those parts burnt black ? Is it due to the shimming ?
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Old 11-24-2010, 09:41 AM   #2
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I'm running an OS VZR Version II with OS RP7 Plug and Byrons 25%. Engine is not running very lean and a fair amount of smoke is emitted when out of corners and straights. But why do I have those parts burnt black ? Is it due to the shimming ?
The burn patterns are from the oil. Castor oil is a big part of those burns. If the engine is running fine, don't worry about the burn patterns.
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Old 11-24-2010, 09:47 AM   #3
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Like Scott said, castor oil turns it black. If it was badly overheating, the caster would char and leave a grey, ashy residue.
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Old 11-24-2010, 06:53 PM   #4
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It's running fine and sounds healthy. So I can just ignore the burnt parts ?
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Old 11-26-2010, 09:50 AM   #5
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It's running fine and sounds healthy. So I can just ignore the burnt parts ?
Yes.
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