Impeller upgraded to 6 blade Ariens (926501) model for use at start of 5th season (2018/19).
The impeller pulley on engine crank was increased from a dual pulley 2.75" stock to a 3.25" Browning that was Shore machine shop modified to fit the AX 414cc crank for 6th season (2019/20). Actual impeller speed increased from 1,181 rpm to 1,447 rpm at engine 3,925 rpm.
To allow stock belts to operate with 3.25 pulley I lengthened the tension pulley slot on the impeller clutch arm toward the slack side. Gives more clearance for belt so it does not drive the impeller pulley when engine idles or full throttle. The brake release roller was increased from 3/4" diameter to just over 1" so brake is released when clutch arm movement is reduced.
Tried the new setup in early November 2019 with 7" snowfall and 18" at EOD with combined road plow and sidewalk plow dumps. The new setup worked well and no engine power issues. Throw distance seems about same but throughput seems to have increased a bit. Snow is ejected from chute very quickly and the noise of the flow is nice and overshadows engine noise. Very pleased with the changes so far.