O&RBike

Next I sourced an engine from Joe Webber out of Missouri. I told him it was a father son project we were working on and he couldn't have been nicer or more accommodating. 

He gave us a great deal on the beautiful 1HP Compact III...looks like nos !

I started this thread over on the Old Mini Bike forum where I am a member but I thought the folks over here might enjoy seeing it too. I have gotten a lot of help over here since joining and I surely appreciate it. 

You may have to bear with me as I figure out how to cut and paste and upload images here....thanks !

As a last resort, I can probably sell the one in the pic even though I need it for a Chicken Power. I'll never use it to mount on a bicycle but I like to keep my engine stuff complete. I'll let it go if I have to because I'll probably come across another one before you do. It will need a longer conduit and cable for use on a bicycle.

 

 

'That would be most awesome if you are willing to part with it just name a price. I usually take forever to finish a project and it doesn't bother me to look for weeks or months for a part but this one is for my kid and you know how kids are he is all amped up to get it done so he can ride it around school.

I'll take a look around first.

here's a pic of an O&R throttle. Not sure where to get the small conduit but maybe a bicycle shop will have it.

Where about in Jersey are you? Grew up in the Cherry Hill area across the bridges from Philly.

 

OR throttle.jpg

 

 

 I am in Cranford...pretty much in the center of the state. 

How hard is it to find an original throttle...do they come up for sale on this forum or Ebay? Should I be searching under Ohlsson & Rice or Orline? 

Curious what you guys are using for throttle cable setups on these. I'm trying to rig up a mini bike type twist throttle and looking for ideas. It doesn't seem possible that it will spring back to idle unless there is some kind of return spring in the handlebar throttle itself as the spring at the butterfly is so light.

What does a stock throttle  cable look like ?

Thanks

One of the pawls was sticking...we removed them both, bent the springs up a little to add tension and put it back together with a few drops of oil on the pivot points.. Seems to work good now.

Lot of end play in that half of the crank..!! Looks like .100 or more. If I'm guessing right the little brass eyelet in the center of the recoil cover acts as a thrust bearing to control this which is why you need to add a drop of oil every so often. What a strange little motor.

We loosened up the cylinder and rotated the exhaust manifold where we needed it to be...seemed to go alright I don't think we damaged any of the gaskets.

There was once or twice while we were running it over the course of the day where the motor appeared to "run away"  ...that is the the throttle was in the idle position but the engine seemed to be accelerating. Maybe it was my imagination or I was breathing too much 2-stroke exhaust. :-/

Thanks for all the help so far...I'm sure I will need more.

-G

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