1.250

LAST EDITED ON Aug-13-04 AT 06:21 PM (CDT)
 
What size prop does this engine need?

I put a glow plug in this weed eater engine and it runs great on model airplane fuel. It has a 1.250" bore. I screwed the idle screw in all the way. I wrapped a small 1/8" dia rope around the flywheel and gave it a pull, it started on the 2nd pull. The motor runs wide open and is extremely loud with no muffler. When the engine fires it sounds like someone shooting off a firecracker then after the engine picks up speed it screams. It sounds about as loud as a Dyna Jet engine running at a higher frequency. The engine will run in either direction because it has a reed valve behind the carburator. Does anyone have any idea what the correct size prop would be for this engine. My son wants to put this engine on a small scooter. I think that could be done if I push a short piece of rubber hose over the shaft and have the hose rub against the scooter tire. I am trying to think of something useful to do with the engine. This is just another experement.

LAST EDITED ON Aug-13-04 AT 06:37 PM (CDT)
 
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Looks like the old Evra 1.9 that Hobby Lobby sold in the 80's and sold later by a company called JAG in California. There were 2 models of this motor and this looks like one of the earlier ones. I'm assuming that you used gasoline to run this motor as the carb is completely useless for glow fuel as the jets are woefully too small You also might look at the conrod in these as they are a stamped piece of metal and had an annoying habit of breaking if the motor over revs .
I'm suprised that this started on the 2nd pull as when they were introduced at the beginning of the giant scale movement in the early 80's they quickly got the nickname of rope a dope motors. Oh the cost of the Evra from Hobby Lobby was $89.95 and the Jag with mount and prop hub and a few other things was $139.95

Oops looking showed me that you have a glow plug in it. Be careful on RPM or the rod is history, also the jets are too small and you won't be able to richen the motor. Get a muffler and the correct prop is an 18/6 or 18/8