The R61F rear exhaust engine has been updated. Better fuel economy and a little more gentle on the airframes than the higher timed Speed 13 version.
Features a new addition, the 10 mm carburetor.
Use with any of the 40400 thru 40403 headers and either the 50400 long or 50351 compact tuned pipe. Don't forget to order the SP4 pipe mount, the strongest and easiest to install mount in the business.
Displacement: 9.98 cc
R.P.M. (max power)17.000 RPMPractical range: 2.000-20.400 R.P.M.
Bore x stroke: 23x24mm
Rear ball bearings: steel
Front ball bearings: steel
Crankshaft:18 mm̴ with 8 x 1.25mm Threads
Carburetor: aluminium - 10mm - Rotary
Glow plug: Standard Special (C6S)
Exhaust position: side