Maconbass-I totally agree with Chuckorlando and Ckau "way too much HP" to have entertaining/safe fun.
Chris97330-Now about the gearing issues you're having. You need as large of front sprocket as they sell for your chain size(13 tooth on the clutch or crankshaft)The 9 tooth currently means you're revving way too much with little to no speed.
Is both your jackshaft sprockets 13 tooth?Your Murray should have about a 60+ tooth sprocket on the axle- if not find one with atleast 50 teeth. 11 hp engine will produce plenty of torque but that style engine will only go so fast as you're limited by 3500-3900 rpm.
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