money vs horsepower/CHAINDRIVE

[pggg]

Stripped and converted drive unit.

[John]

Hey Kiwi! What kind of Dogs breakfast is that?

[TopCatGr58]

Hey PGGG,

That's great, would you mind taking a few more shots from different angles with it assembled, so I could see the opening for where the chain runs thru it towards the rear! I'm looking into possibly acquiring some old Middle Gear assemblies, and see what my machinist friend and I can come up with for another project bike down the road!?!? Thanks in advance!
T.C.

[pggg]

Hey Tex, an El Cheapo dogs breakfast - it's all just drills, files, and hacksaws down here bro. Curtis I'll take some other pics when I sort the shimozzel out.

[GNEPIG]

we would also like to see the progress on your swing arm and tensioner
looks like fun so far

[pggg]

GNP, heres the swingarm at the moment - cost zip so far. How scrooge likes it. Have decided a sliding axle is the way to go so shall hacksaw 16mm off the ends and weld on 2 solid steel 1/2 rectangles 40mm long. Adjuster bolts on the ends. (the Texan thinks I'm mad )

[superdave]

pggg

That should work ! Looks fine. Not that i needed to tell ya ! Question ? How far off would an fj 1100 swing arm be? as far as pivot hole dia, and tube width? I now a set of shock mounts would be needed but you would have your sliding axle? would it be less work is what i'm getting at, I sure somebody has tried. Go for it !

[uk1.1s]

Nice....

Really interesting to see the progress pgggg

Only completed projects I've seen photo's of had an "out-rigger" bearing included on the side furtherest from the bike past the drive sprocket.

Dunno the reason - Probably to allow a long distance between the middle gear casing and the sprocket - which of course would give you room for a wider tyre.

Thought I'd drop this info in just in case you are scratching your head over spacing probs or anything.

Keep thinking that dropping an FJ1200 or XJR1300 engine and swinging arm straight in would be fun. XS purists will no doubt turn up at the front door tonight with the burning torches

[DiverRay]

pggg don't worry about the Texan, he's on some GOOD drugs at the moment. The swingarm looks nice, but I think you may be able to find an old swingarm with adjusters that you can "transplant" to yours.
Just my .02 idea.

Ray

[prometheus578]

2 stroke run backwards

For Pat kelly,
Had two Harley Davidson golfcarts. Think they were 1965's. Two stroke engines, and to go in reverse, throw a switch, the juice changes direction to the starter/generator, and starts and runs the engine backwards.
Hey!! just remembered.... I sold one of them for $500, and used that money to buy my first XS1100.
Gee... and I thought Harley products were worthless!

[pggg]

The drive unit's all sussed and sorted so it's 'just' the rear-end drama to go. A whole FJ rear-end would be tempting, but the chances of an alloy monoshock unit being an easy 'bolt on ' fit are slim. XS swingarm pivots are 300mm between - I'm guessing an FJ is narrower. Hacking off some other steel swingarms' chain adjusters and welding on to my 'freebie' swingarm has to be a good option. Am still reasonably confident of sticking to a miserly tightwads budget .

[superdave]

tightwad

Go for it ! what rear gear you going to try?

[pggg]

Hey Dave, am checking out some old wheels and stuff this weekend - will stay posted.

[pggg]

TC, here's your rear view pic. The sprocket needs to be positioned against the spline stop, as if it's any further to the left, chain clearance problems with the bikes' rear frame will occour.

The sprocket needs to have a collar because of the indents beside the spline stop. I originally made a collar by hacking off the ditched bevels' collar with an angle grinder. (those bevels are HARD!)

The spline takes a l/h spacer - easily made with 30mm I.D. steel pipe.

The 13 tooth sprocket is the maximum size that can be used (standard 520 5/8 pitch chain) The 12 tooth sprocket gives a bit more breathing space between chain and crankcase. ( the 13T still has clearance though)

The other pic shows the whole unit roughly bolted to an old spare motor and frame.

The bracing plate is 3.5mm steel plate. The support bolts are cut from 8mm threaded rod. The front 6mm bolt screws into the gearbox cover.

[TopCatGr58]

Hey there PGGG,

These are great photos, really helps in understanding what has to be done to the OEM middle drive to convert it!!

Was playing around with the gear ratios....supposing a 16" rear wheel! Thru previous calculations, at 60mph that rear wheel is generating 785 rpm, and thru backwards calcutions of the final drive ratio that translates to appx. 2560 middle drive shaft RPMs.

Now, with 12 tooth front sprocket, you get 30720 teeth divided by a modest 33 toothed rear you get 930 rear wheel rpm which is about 71mph. BTW, this is appx 4,000 Engine RPM in 5th!!

So...double that to 8k engine rpm, and you've got 142mph!!!!

Now, if you want a more stock profile of engine rpm to rear wheel rpm, then 12 front, with 39 rear gets appx 789 wheel rpm. A better off the line machine, but a more limited top end of appx. 132mph at 8.5k !

Now, the JCW catalog list sprockets with 33 teeth fitting a Honda CM200T, the 39 a Ninja 600!

BTW, how long is the chain going to need to be to reach? A 520 ata 5/8"per link, 126 link is about 6.5 feet!
T.C.