The FS91R and the FS131R take the same engine shroud!

[Merkava_4]

That blows my mind! They take the same air filter cover and clutch fan housing too!

All this time I was thinking the FS131R powerhead was going be way. . .WAY BIGGER!

This should make going from an FS91R to an FS131R a piece of cake!

 

[EFSM]

All this time I was thinking the FS131R powerhead was going be way. . .WAY BIGGER!

Nope. 90, 100, 110, 130 the same block series. 91, 111, 131 the same. They even use the same carburetor for all the different sizes in each series.