Aloha,

I was wondering what is the average life span of this motors bushing before excessive fuel leaks out the front end of the bushing?  I normally run a rich 2 stroke with GMA 10/22.  I have had leaky front end problems lately from an
FP 20 with a relatively new crankcase.

Best regards,

Mike Wada:)

Hi Mike

It is very hard to put a time or number of flights on that,
it depends on your fuel, how rich or lean you run, how heavy your props are, how much sand  dirt debris you suck up at launch, There are  many factors that will determine how long a plain bushing in any case  last.
If you want the engine to last as long as possible use a good quaility fuel, stay away from heavy props, run an air filter over the venturie, try to run the motor slightly richer, or in the FP 20 case make sure your in a wet 2, not a sagging 2.  and do not fly in very dirty dusty areas

Randy

Wise words from Randy.
If your motor is still running well you can always cut an oil collector/return groove at the front of the bushing with a dremel. I use a dentist's burr cadged from my dentist after he's finished attacking my teeth. Measures 0.035" dia.

Can you be more specific about the groove?  Is it just a straight line parallel with the bore, or do you do something else?  I can probably use this information. A picture would be really great to help me understand the method. Thanks.

Good instructions, even I can understand this.  Thanks