RCU Forums - 28 & 31 cc Ryobi

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cutarug

04-16-2008 07:51 AM

28 & 31 cc Ryobi

How can you tell the difference between the 31cc & the 28cc Ryobi.
I have looked all over the crankcase but nothing gives me a clue as to the capacity.
Does anyone know the bore and stroke of these two engines

clocknut

04-16-2008 08:31 AM

RE: 28 & 31 cc Ryobi

I think the 31cc is 1.375"x1.250"

hackinboy

04-16-2008 09:00 AM

RE: 28 & 31 cc Ryobi

Cutarug,
I may be wrong but im pretty sure the 28 and 31cc engines have different cooling fins at the spark plug. The 28s have either one or two cooling fins that are much smaller than the others. I know there are pictures in here somewhere showing the difference

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