SXR Tbm gridle head domes question

[ridburton06]

Im a newb and i need help. I know i have a tbm gridle head but not sure which domes i have. Is there anyway for me to find out? Also what exactly do different domes do?

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[ridburton06]

Anybody please help

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[Scorn800]

Dome size should be marked where spark plugs screw in. Different size domes give different compression

 

[ridburton06]

Ok so if i wanted to.lower my compression would i go bigger or smaller domes?

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[Cross]

Bigger cc will give you less compression. Also look to see of there is a letter "L" with the dome size. That indicated they are a step down style dome. You will need that same style.