O&RBike

We'll pull the recoil cover off today and take a look. Is that synthetic 2-stroke you're using..? .seems that's all the stores have now. Regular 87 octane gas? It's hard to find non-ethanol fuel around here I hope it doesn't destroy the carb diaphragm.

Thanks again, yes we're using a jack shaft setup with a final drive ratio expected to be about 18:1. Ran the motor for the first time today.We're running some 16:1 (castor + 120 octane) mix we had already made up for a West Bend 580.Thought it might foul the plug but it seems to like it...runs good. We did notice one odd problem. The recoil operates fine unless the motor is running, then instead of winding the rope back in it actually it wants to feed it back out. The starter pawls or whatever is in there must not be retracting fully.

Thanks Wallfish. Yes I have seen the "Chicken Power" engines in the past but never owned one or knew much about them. I saw a crazy articulated scooter called an Eel Wheel too. This one will be clutch and chain driven. I will try and post some pics as we progress....or maybe not if it doesn't work lol. The screw that holds the pto shaft on feels like it is an interference fit on the thread..perhaps to keep it from backing out ? Any recommendations on the torque here or just use my best judgement ? Don't want to snap it off. Thanks again.

Howdy all. Helping my son build a small (BMX) 20" bicycle that uses a 1HP O&R engine as a power assist. The idea will be to pedal it up to approx. 10 MPH and then let the motor propel the bike to (hopefully)20 MPH if geared properly. Not sure if it work but it will be an interesting exercise for his mechanical engineering project. I am new to these engines and have a few questions . It has a 1/2" sleeve with an internal taper that mounts to the crank pto. It looks to be maybe a 10-24 grade 5 fastener holding it on...doesn't instill a lot of confidence. Is there a torque spec for this screw..? Can I swap it out for a grade 8 socket head cap screw? Regarding the strange doughnut shaped exhaust manifold...can I loosen the cylinder head/barrel assembly just a little and rotate that exhaust to point in the direction I want it to and then snug it back down again? Do I need to change the gasket or seal once I break it loose? Is there a torque recommendation for this or just make it "tight"...? Thanks in advance. Gerry