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addition to ryobi mount info

Post all about your home built rides here. Weedwacker motors, lawn mower engines ect. This area is for non kit builds


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  #1  
Old 10-09-2008, 12:32 PM
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Default addition to ryobi mount info

I'm pretty sure everyone has seen my design for mounting a ryobi engine The two rails that attach to the engine, the front harp, and the scissor hinges to keep it in line.

Now I wish to add this bit of information. How to mount it to the bike with no damage to the bike. No drilling or even scratches if you are careful. So here it is...

Engine to be rear mount friction drive
New parts added to old design


The rear mount harp secured with 1/4 double nuts and thread lock.

A par of hardware 6" "L" brackets make up the top of this harp. The lower bracket has to be cut off an inch or so to bring it in line with the axle width. The top one is not cut as the henge will rest on it.




The two side drops are used to secure the mount. The lowest hole is used for the brace that attaches to the bike's accesory hole above the axle or to the axle itself depending on whether or not there is an accessory hole.

The second brace runs from the top hole in the "L" bracket to the frame of the bike. It is secured with a pipe clamp bent so that it wraps around the bike frame and then bolts through the brace.


At this point our standard engine mount is attached to the frame with a henge that bolts to the top of the harp. The engine swings forward onto the tire. Standard springs and turnbuckles ect.

The motor raises and lowers by a lever attached to the bikes from near the handlebars.



The throttle is also part of this mechanism.... This arrangement will in no way change the bike and will be 100% removeable. All parts that are attached to the bike will have inner tube glued to them where they meet the bike frame.



This assembly will be secured to the bike with hose clamps to avoid any scratches wrap the bike tube with tape.
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Old 10-09-2008, 06:16 PM
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Talking Re: addition to ryobi mount info

I like the throttle assembly. It reminds me of those old school shift levers you would get on the 1980's road bikes, where the shifters were on the top tube. If you could get your hands on a set of those I'm sure it would be really easy to retro fit.

However I suspect that like many old school things they are in favor with the hipsters and are prohibitively expensive.

That being said they look a lot like lawn mower throttles too.

To make one what about creating a u shaped piece of steel wider than the top tub, line it with rubber, and then bolt a u bolt up through it to clamp to the top tub, then levers could attach to it but not damage the top tube?
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Old 10-09-2008, 08:12 PM
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Default Re: addition to ryobi mount info

I already did one with the square box tube. One side is already the clutch and the other will be the throttle. inner tuber on the bottom to protect the bike tube and then just hose clamps.

A lever is just a straight piece of metal with hole in the bottom for the cable. Nothing could be simpler. I think I'm going to do the ryobi I have just see how much trouble the darn thing is to operate.
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Old 10-10-2008, 07:42 AM
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Talking Re: addition to ryobi mount info

Quote:
Originally Posted by deacon View Post
A lever is just a straight piece of metal with hole in the bottom for the cable. Nothing could be simpler. I think I'm going to do the ryobi I have just see how much trouble the darn thing is to operate.
How do you attach the levers to the top tube? that's what I'm saying to do with the bar bent to a U. Bend a u shaped piece of metal that will fit over the top bar, with enough room for a u bol drill 2 hols in the bottom of the u for the bolt to go through. Slip the U shaped piece of metal over the top bar, slip the U bolt up through it, and the upside down arms of the u, give you something to attach your levers to, without drilling the bike.

I made a ghetto diagram to show you what I'm thinking of. hope it makes sense.
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Old 10-10-2008, 10:03 AM
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Default Re: addition to ryobi mount info

I have an eight inch long piece of the box tube i used for the lift handle. I drilled a hole straight through it and put on lever on each side. I am going to contact glue a strip of inner tube to the bottom then hold it on with two hose clamps. Pretty simple stuff. I don't have to bend anything.

Once I redo the 33 bike to a rear harp mount, I will have that whole lever to make controls with.

Ps the full suspension was first it just has a hole drilled through it. That tube is about four inches so it is strong enough. I was about to junk the ryobi because it was hard to start. Not anymore. The new throttle stays where I put it and the engine started on the second pull. You got to love when a device works as you imagine first time out of the box.

I am going to build a kit on a 26" frame I have, then take it apart and make detailed drawings of it. So I can make more of them. Try to package all the hardware in one box and see if anyone wants it without the engine.

If not I'll just add an engine and see if anyone wants a bolt on ryobi friction drive.

Shoes the threads on a Ryobi drive shaft are either 5/16 24 or 3/8 24 not 26.... Trust me I know for a fact lol...
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Last edited by deacon; 10-10-2008 at 10:09 AM.
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Old 10-10-2008, 09:25 PM
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Default Re: addition to ryobi mount info

I'm going to have to check the peg, I was pretty sure it was 26... Could be wrong...
Could it be that the different models have different shafts?

too tired to really think it out tonight.
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Old 10-11-2008, 07:27 PM
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Default Re: addition to ryobi mount info

Best I can tell the ryobi had the 3/8 24 then either switched to 5/16 x 24 or they might still use the 3/8 24 on their clutch models and the 5/16 on the non clutch model.
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Old 10-12-2008, 12:03 PM
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Default Re: addition to ryobi mount info

discovered something interesting today. Took me a while to figure it out but I think I finally have. When I open the throttle on these engine with the big throw shifter lever something happens I never expected. they will go past wide open and start closing down again.

I thought that the carb was going bad or that I had watered down gasoline. when I hit full throttle, instead of speeding up the revs started going down. Best I can figure the carb has gone past wide open and is closing down again backwards.

Took me three days to figure that out, can we all duh.
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Old 10-19-2008, 10:16 PM
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Default Re: addition to ryobi mount info

Deacon I have a pic of the mount I used. I like it because it is so simple. You just use the bolts that hold the rear brakes in place. I put a washer under so that there is plenty of room for the brake arm to move. It is just a simple piece of angle Iron. Have fun, Dave
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Old 10-19-2008, 10:31 PM
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Default Re: addition to ryobi mount info

Egor, that is a trick set up. Clean and easy. Well done. Gotta get me an old go-ped.
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