the Wasp
rrProfessor
Location: Vt
| Andre,,, in the late 80s I use-to port my own gasoline weed eaters and small chain saw motors for my RC boats, the first motor I did was a Home Lite 25cc and I did the port modifications with files, and I bought a larger carb from Warehouse Hobbies, it worked out very well, the motor ran quite strong,,, then I bought an Sherline milling machine,,, I ported a lot of motors on that little mill,,,
I would think that the Tanaka would be some where around 1 & 1/3 HP (but I don't know for sure !!) and I would think the Tanaka is a well made motor, it just needs some work,,,
raising compression and modifying port timing,,,
when modifying the Zenoha 23 (and other motors) for RC boats I used to remove 20 or 35 thousands on the bottom of the cylinders to increase the compression, but when this is done you lower the exhaust port (lowering your exhaust port lowers your top RPM, not good), so by removing 20 thousands on the bottom of the cylinder you must remove 20 thousands from the top of the exhaust port to get the port timing back to the stock timing, so at this point your exhaust port timing is still stock but you have increased your compression (so when cutting your exhaust port you may want to raise it another 10 or 15 thousands to raise your top RPM some),,, and remember, if you increase your compression buy removing 20 thousands on the bottom of the cylinder, that also lowers your intake port, so you may want to raise the top of your intake port 20 thousands,,,
intake ports,,,
ALL the gasoline motors I modified "had quite small intake ports",,, I would widened the intake ports by removing 20 or more thousands off each side, and after raising the compression I would remove the same amount off the top of the intake port as I removed off the bottom of the cylinder, this will raise the top of the intake port to match the bottom of the piston skirt when the piston is at top dead center,,, and on some motors (like the Zenoha 23) the top of intake could be raised even more than what was taken off the bottom of the cylinder, because in 100% stock form when the piston is at top dead center the bottom of it's skirt is much higher than the top of the intake port,,, (and rememmber that 20 thousands is half a millimeter, so removing 20 thousands off each side of your intake port = 1 millimeter)
as you said you don't need a racing motor, you just want more power for more fun,,, so,,,
my suggestions,,,
compression, remove 25 thousands off the bottom of your cylinder,
exhaust port, raise 25 to 35 thousands off the top,
intake port, raise 20 thousands off the top and widen it by removing 20 or 25 thousands off each side,,,
as for the carburetor, just run the same carb that is used on that hot Zenoha heli motors...
Oh, you may need to match you manifold to the intake port after the modifications...
Jim
Jim
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