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Old 04-09-2011, 10:46 AM   #51 (permalink)
dcb
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not USD, the shiny parts are on top. And I'm a bonehead because my gs has the sprocket on the left and the yz is on the right Certainly the yz layout has much more character, but I doubt I can make it street legal cost effectively.

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Old 04-09-2011, 10:53 AM   #52 (permalink)
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Um... I fail to see the problem, Dave...

You've got to gear up the engine's input.. So instead, run the motor direct to the trans, and change your output with a jackshaft. That gives you gearing, and moves the output to the correct side.

You could also flip the whole thing around and run the motor backward... Bit the gears probably wouldn't be happy with that.
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Old 04-09-2011, 10:55 AM   #53 (permalink)
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Alternatively, you could figure out what it will cost to ship me that trans...
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Old 04-09-2011, 11:01 AM   #54 (permalink)
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I'm considering all options

maybe using the transmission to drive a rear wheel on my car in a mild parallel hybrid? Keep 4 batteries in the trunk and have a mote of regen.

The jackshaft would be another efficiency/fabrication hit is all. And I fancy some designs on a two speed jackshaft that would eliminate the transmission entirely for me.

Maybe turn it upside down and reverse the rotation too, if I thought the gears would stay lubed.

Is your sprocket on the right for your motorcycle of choice?

I think I am going to have to reconsider the value of the separately sealed transmission in this 2 stroke :P
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Old 04-09-2011, 11:05 AM   #55 (permalink)
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Nope, unless I change the wheel, but it won't be easy to find another wheel as light as the 16"spoked wheel and drum brake.
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Old 04-09-2011, 11:06 AM   #56 (permalink)
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I'm considering spinning the wheel around too so the sprocket is on the right, and extending the brake rod so it can activate on the left.
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Old 04-09-2011, 11:07 AM   #57 (permalink)
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Do.
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Old 04-09-2011, 11:11 AM   #58 (permalink)
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Old 04-09-2011, 11:58 AM   #59 (permalink)
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2 speed final
Scooter
Jackshaft
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Old 04-09-2011, 12:06 PM   #60 (permalink)
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well I might have a two stroke available, I looked up the ratios for the gs250 and I am liking them better:

gear, ratio
1, 2.5
2, 1.625
3, 1.21
4, 1.0
5, 0.863
6, .782

primary reduction is 3.125

it might be trickier, but the ratio of 1st to 6th is 3.2, which is nice and wide (and it bolts up and lines up already).

If I tapped into the primary reduction, at 3500rpm, with my 15/37 sprockets, I would be at 42 mph. If I can bodger a 27 tooth rear sprocket then I'm at 57mph.

Or sprocket and chain interface directly into the secondary shaft somehow with a suitable ratio for the existing wheel sprockets (maybe 2:1?). I see some dissassembly and welding of sprockets to transmission shafts in my future

Christ, you still have the gearbox for that honda? Care to get a handle on the ratios?

The secret might be sealing the stuff at the motor shaft behind the sprocket, or if not sealing, adding a slinger ring and any necessary internal baffle to control the oil. If the motor shaft is above the oil level then it should be livable and the chain would stay plenty clean and lubed.

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Last edited by dcb; 04-09-2011 at 12:16 PM..
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