two options for the moddified F/D im working on

[dchevygod]

Ive modified a daemon friction kit because of design flaws and now have two options i could work with. For one thing im staying away from gear reductions. Iv found a 9t sprocket for a 5/8 shaft and 48 is the largest rear sprocket ive seen that i can make work so i need a larger rear sprocket made or something. I also thought about the belt drive stuff ive seen on electric scooters and such but the tall gearing is an issue here as well except for the dual rim hoop pulley idea i saw some people do. In the friction setup its ok but im ambitious to say the least. The engine for this build is a CY460R no matter what configuration it is upon completion. The first thought was to just leave it friction but im pretty sure that ill eat tires really bad with 2.8 ft/lbs of torque and 4.2hp.

 

[5-7HEAVEN]

Eat tires real bad? I ran a 460 engine on friction drive. On one occasion, every inch of the rear tire was covered with deep grooves...in a matter of one week.

When I swapped to chain drive/shift kit, I never replaced the rear tire again.

 

[lowracer]

dchevygod,
I experienced the same tire chewing problem running friction drive with a high powered pocketbike engine. I switched both pocket bike engine bikes to v-belt drive. I still have one of my MB's setup as friction drive but with a low powered Subaru Robin EH035 & it seems to do fine. It hasn't eaten a tire yet.
-Lowracer-

 

[5-7HEAVEN]

Ive modified a daemon friction kit because of design flaws and now have two options i could work with. For one thing im staying away from gear reductions. Iv found a 9t sprocket for a 5/8 shaft and 48 is the largest rear sprocket ive seen that i can make work so i need a larger rear sprocket made or something. I also thought about the belt drive stuff ive seen on electric scooters and such but the tall gearing is an issue here as well except for the dual rim hoop pulley idea i saw some people do. In the friction setup its ok but im ambitious to say the least. The engine for this build is a CY460R no matter what configuration it is upon completion. The first thought was to just leave it friction but im pretty sure that ill eat tires really bad with 2.8 ft/lbs of torque and 4.2hp.

How's your project coming along? What size chain does your 9t/48t sprockets use? JMO, but I would avoid custom sprockets until you decide if you're going sprocket, friction , belt or CVT drive. Experimenting gets expensive, I know from experience. Try using OEM stuff for pocket bikes, scooters, etc. They're cheap. Then when you're satisfied with the results, custom machine your specific drive components.

Hey, how's that modified daemon friction drive project coming along? Got it running yet?

 

[dchevygod]

Well 5-7 im sure it would work pretty good but the spindle is slightly off causing binding with the outer support bearing installed. I had a pedding buddie offer me a gebe drive/wheel sprocket and belt soo that is an option that needs some thought before proceding but im just pipe dreaming a lil bit. once my motobecane is on the road youll be the first to know!

 

[dchevygod]

yay!

I was given the sheave, belt and drive cog from a GEBE kit for free! And my F/D i might sell it and put the $ towards the 460 purchase. but ill need to figure out a rack for my engine, because the F/D doesn't line up for that at all. I would have to flip it around and space it to one side, I think it would look funky. I do have disc brakes and that is a limiting factor i have to deal with. I cant just use the axle as a mounting point for a strut system thats still the biggest issue ive had so far. Today i made the unused existing brackets for the v brakes a usable strut mount, with some turnbuckles and a few pieces of threaded rod. I still need to weld a small steel piece onto the mount for the goped tank and right side turnbuckle/strut to bolt on.

 

[5-7HEAVEN]

Looks like you have at least two motorized bike projects going for you.

Any pics?

 

[dchevygod]

 

[5-7HEAVEN]

Ingenious support/turnbuckele location!

How are you retaining the outboard bearing?

Are those two holes to mount your goped tank? That's where I mounted mine.

You'll ride 4 times farther with a 4-liter HT tank on the top tube.

 

[dchevygod]

thanks man! That was the only option i could see working.

The bearing has a retaining clip.

Acctually those holes are to access the mounting bolts easier, the plate im holding Is the mount location for the tank

I need a fuel return and the cables are on the top tube or id do a ht teardrop tank for sure.