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jak · 06-07-2021, 09:48 AM

Gas and radiator caps are the easiest way to tell.

28-29 both are threaded on the OD of the neck
30-31 both are twist and lock style caps.

06-07-2021, 09:48 AM	#7
jak Senior Member Join Date: Sep 2010 Location: Maryland Posts: 279	Re: 28/29 versus 30/31 Gas and radiator caps are the easiest way to tell. 28-29 both are threaded on the OD of the neck 30-31 both are twist and lock style caps.