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Carby Inlet Rubbers
It is essential to check carefully your carburettor inlet rubbers (ie the rubber between the Carby and the engine) annually or every 100 hours for cracking or splitting. These have been known to crack or even split over long periods of usage and this can lead to at the least poor running and at worst the carb falling off! Sometimes the split is nearly invisible, so it may be prudent to remove the Carby and flex the rubber to show up any cracks. Cylinder Heads Don't forget to check cylinder head torques at 5, 10, 15 and 25 hours during engine break in and thereafter every 25 hours, all in accordance with the head torque procedure. Head Torque 24ft/lbs on all engines. Do not unload the head bolts prior to checking their torque, as this could break seal between the barrel and head. Cobra Heads The fitment of a Cobra head to your carburettors is recommended to present the carby with a smooth flow of air. The flexible corrugated hoses provide a turbulent flow of air into the carb and they also impede flow to a large extent. The Cobra head is effectively an elbow which provides a smooth transition into the carb from the airbox. A small length of hose is still required. note if you are retro-fitting the Cobra Head, you may need to redo the outlet from the airbox as the outlet and carby are not necessarily inline! Improvements should be gained in power and also more accurate fuel metering from the carb. CHT Senders We usually replace the standard plug ring of 14mm diameter with an electrical connection of 13mm diameter that fits under the spark plug better. Crimp must be firm onto the 2 wires or inaccurate CHT temps will be displayed. Coils The new Honda type coils have been discontinued on both the 2200 and the 3300. This occurred a while ago. However the new type coils (black cases with a white resin fill) were installed on all 3300 engines and on 2200 engines s/n 1207 - 1213 and then from 1292 onwards. Honda changed the coil circuitry, which needed a wider gap to fill. Gap set was 0.032” or 0.80mm. These coils were used on the 2200 engines s/n 1204 - 1206 and from 1214 - 1291. Coil Cooling Since we have changed from the Honda coil to one of different manufacture (black cases) it has become more evident in the need to provide some form of cooling. On the 6 cylinder we have always suggested this. Practice has been to install a ˝” or 12mm aluminium pipe suitable bent and fixed to the rear top of the coils. Coils do run better and give longer service if they are not required to run in a very hot environment. This also depends on the climate you are flying in. While coil life is usually the life of the engine, some replacements have had to be made. When setting coil gaps it is important to check all the magnet pole plates on the flywheel for gap to all coils. If coil pole onto flywheel the heat generated usually destroys the coils’ function. Cold Starting See starting
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