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  #8511  
Old 09-09-2015, 12:23 PM
crassius crassius is offline
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Default Re: what did you do to your motorized bicycle today?

if it wasn't running 'funny' when you shut it down, I'd be thinking ignition or fuel
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  #8512  
Old 09-10-2015, 09:39 AM
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tgaydos tgaydos is offline
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Default Re: what did you do to your motorized bicycle today?

i've got a new magneto coming as that's the only thing i can think it is after having tested all the other things. mechanically it's fine and it's getting fuel, there's no way i burned up two plugs and two cdi's in the short time i've had the bike.

I got new hardware yesterday for the motor and i had a pain in the ass time trying to find the sizes, i ended up taking one of each bolt in to fastenal and get it matched up that way. Here's what i came up with for sizes and part numbers from fastenal. They're all hex cap screws.

Sprocket cover: m6-1.0 x25mm; pn 1139568
Clutch cover: m6-1.0 x20mm; pn 1139567
Case mount: m6-1.0 x35mm; pn 1139570
Magneto cover: m4-.70 x16mm; pn 2139526
Case bolt below the jug: m6-1.0 x40; pn 1139571
Head studs: m8-1.25 x90mm; pn 1139599

This is for my flying horse angle fire from bike berry.
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  #8513  
Old 09-10-2015, 09:07 PM
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Tony01 Tony01 is offline
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Default Re: what did you do to your motorized bicycle today?

Finished cutting and grinding/shaping my 2-speed jackshaft plates. I was cutting and grinding these for about four days. Each plate is 3/16" iron and weighs a bit over a pound. Once I get the setup solid and it comes time to paint, I will remove the plates and drill around 40 holes to remove a pound!!

The big issue right now is chainline and deciding if the final drive sprocket will be between bearings or not. I drew the assembly in solidworks before starting and planned on not between, but now in putting it together I can see there is more space than anticipated.
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  #8514  
Old 09-12-2015, 12:34 AM
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tgaydos tgaydos is offline
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Default Re: what did you do to your motorized bicycle today?

it almost looks like there should be a cut in the frame and mounts for a spring to add rear suspension. what motor do you have? that's badass.
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  #8515  
Old 09-12-2015, 05:48 AM
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Tony01 Tony01 is offline
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Default Re: what did you do to your motorized bicycle today?

Yea I would like to put a rear suspension pivot right on the rear jackshaft but there isn't enough room on the shaft anyway. I could put it just behind the JS and the chain slack due to misalignment would be minimal... But man it's a project for another bike I think. The engine is a briggs & stratton 3.5hp- 148cc and the block you see is a worn out aluminum bore block. Have a thread in hubs/gearboxes on this transmission. Here is my first solid mockup with JS solid. The slack between shafts will be adjusted by moving bearings, the overall slack bias can be moved forward or back to tension or loosen the engine chain while doing the opposite to the final chain, and the entire assembly can be moved up and down the seat tube which will adjust slack for my pedal chain which connects to the rear jackshaft.

Is it normal to be working on your bike till 3am?
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  #8516  
Old 09-13-2015, 04:08 AM
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Davezilla Davezilla is offline
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Default Re: what did you do to your motorized bicycle today?

Still making slow progress because it's been crazy busy at the shop this summer but I assembled a Super Rat engine for the mountain bike installed a crank set off an older schwinn mtb but the small chain ring was hitting the swing arm so I took it off and tried a few other crank sets I got sitting around, they all hit so I went ahead and ordered a Specialized jis crank set since it had the right offset and will clear the swing arm. The frame tubing on this bike is also wider than the engine mount's stud spacing so I ordered a piece of 1 inch thick 6061 aluminum bar stock so I can make the custom mounts on my cnc. My plan is to join 2 pieces then rout out the hole for the frame tubing for both the front and rear mounts since the seat post tube is also quite a bit bigger than most bikes and wider than the stud spacing on the rear mount as well.
This will make for a nice solid mounting setup that won't harm the aluminum frame tubing.
I also zip tie mounted the engine to the frame as a mock up to see how the CR 80 pipe will fit and what bends will need to be re clocked. I like the CR 80 pipe's shape since it also looks like only one bend will need re clocking for it to fit perfectly, and the stinger points to the back of the bike perfectly so a lot less modifying will be needed there. I got a set of wheels on the bike now so I can roll it around to and from where I'm working on it but I'm also thinking about making up a set of wide 24" rims or lacing some 50mm wide rims to my hubs, unless I can find a 24" rear well with a disc brake hub and a really wide rim pre made.

I didn't have enough time to mess with the road bike but I'm going to take some measurements so I can make some billet brackets to secure the pipe to the frame , I just need to weld a few spring mounts to the pipe and find a way to secure the back of the pipe then it'll be ready to start the engine and start breaking it in.
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  #8517  
Old 09-15-2015, 12:56 PM
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tgaydos tgaydos is offline
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Default Re: what did you do to your motorized bicycle today?

i didn't do anything, i'm waiting on payday so i can get a new rim since i hit a pothole and put a nice flatspot in the rim, and the other donor rim i had doesn't fit the spokes as it's a mtb rim instead of a cruiser rim, different shapes where the spoke sticks through. and i'm still in need of a sprocket for my peddle side.
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  #8518  
Old 09-15-2015, 02:01 PM
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DaveC DaveC is offline
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Default Re: what did you do to your motorized bicycle today?

Still plotting and planning the electric rear hubdrive on my West Coast Special. Going with a 24 volt 500 watt motor and 2 tractor starter batteries. Going for mileage not speed
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  #8519  
Old 09-15-2015, 05:20 PM
Uncle Bob Uncle Bob is offline
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Default Re: what did you do to your motorized bicycle today?

I rode mine to work and back home again, as I do everyday. Now I'm planning my next build, a Lifan 98cc ohv with a moped rear hub, drum brake, right side freewheel peddle sprocket and left side variator pulley with built in 12.5-1 reduction laced to a 26 inch bicycle rim. and the planning continues.
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  #8520  
Old 09-15-2015, 07:59 PM
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Davezilla Davezilla is offline
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Default Re: what did you do to your motorized bicycle today?

Finally finished welding up the KX65 pipe so it fits my road bike... I got it fitting really nice but had to re aim the stinger so it wasn't blowing right at my crotch, then I added about a foot of tail pipe to the whole thing so now it runs about 6" behind the seat post and points straight back. I'm going to run it like this and see if it's going to be too loud. I got a Pro Circuit muffler I can fit onto the pipe if it's louder than I'm expecting...

For the Mountain bike, I'm waiting on some aluminum bar stock and the new crank set to come in, then it's off to CNC land to carve out some custom mounts. I got a Pro Circuit pipe off a CR80 for this one but I need to get the engine mounted before I can even think about cutting and re clocking the pipe to make it fit...
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