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dcb · 04-09-2011, 01:07 AM

yup, got the caboodle too (plenty of broken bits though).

Here are the approximate ratios from the crankshaft to the rear wheel (just turning the wheel one rev and listening to the compression):
gear, crankshaft turns for one wheel turn
1, 33
2, 25
3, 20
4, 17
5, 15
6, 13.5

seems pretty close ratio (no surprise) with 1st gear being 2.44 times the ratio of 6th. My saturn is about 5.3. Ah well, I'll be different shifting my electric a lot

It should still add up to better acceleration and climbing.

looks like a 49 tooth sprocket on the rear and probably a 12 on front.

jt sprockets lists commonly available options for 12-15 teeth for front and 40-52 on rear JT Sprockets: Catalogue (though I don't have any plans for the rear yet. It is about 12.75 inches radius to the outside of the knobby).

Will take the jug off soon and get a closer look at how to interface with the transmission.

edit: re 2.44 , it might not be too bad, I looked at a gs1100 and 1st to 5th was 2.6
Suzuki GS1000G, GS1000GL, GS1100G, GS1100GL, GS1100GK

edit 2: of course the yz transmission was designed for maybe 24.6 hp at 10500 RPM

and I have a peak hp of 14hp and 3500 rpm redline, so if I drive the crank (or crank surrogate) directly I will need to gear up the speed on the tail end. I should really consider gearing up going into the transmission and keeping the torque demands low. If I drove the crankshaft directly with the etek on this bike I would have a top speed of 20mph

So maybe 3:1 gear ratio going into the transmission. Though the peak hp torque difference is 1.68:1 (the etek has more torque). Dunno if the tranny can handle 68% more torque of direct drive (probably handles a lot more than that when you dump the clutch) but direct would seem to be a bit more efficient if I didn't need an extra chain.

edit, I cannot get much above 30mph using common sprockets and direct drive. for maybe 60mph and direct drive into the tranny, I would be looking at a custom rear sprocket with like 15 teeth!! (or use a standard 15 tooth on front and a custom 19 tooth on rear)

04-09-2011, 01:07 AM	#47 (permalink)
dcb needs more cowbell Join Date: Feb 2008 Location: ÿ Posts: 5,038 pimp mobile - '81 suzuki gs 250 t 90 day: 96.29 mpg (US) schnitzel - '01 Volkswagen Golf TDI 90 day: 53.56 mpg (US) Thanks: 158 Thanked 269 Times in 212 Posts	yup, got the caboodle too (plenty of broken bits though). Here are the approximate ratios from the crankshaft to the rear wheel (just turning the wheel one rev and listening to the compression): gear, crankshaft turns for one wheel turn 1, 33 2, 25 3, 20 4, 17 5, 15 6, 13.5 seems pretty close ratio (no surprise) with 1st gear being 2.44 times the ratio of 6th. My saturn is about 5.3. Ah well, I'll be different shifting my electric a lot It should still add up to better acceleration and climbing. looks like a 49 tooth sprocket on the rear and probably a 12 on front. jt sprockets lists commonly available options for 12-15 teeth for front and 40-52 on rear JT Sprockets: Catalogue (though I don't have any plans for the rear yet. It is about 12.75 inches radius to the outside of the knobby). Will take the jug off soon and get a closer look at how to interface with the transmission. edit: re 2.44 , it might not be too bad, I looked at a gs1100 and 1st to 5th was 2.6 Suzuki GS1000G, GS1000GL, GS1100G, GS1100GL, GS1100GK edit 2: of course the yz transmission was designed for maybe 24.6 hp at 10500 RPM and I have a peak hp of 14hp and 3500 rpm redline, so if I drive the crank (or crank surrogate) directly I will need to gear up the speed on the tail end. I should really consider gearing up going into the transmission and keeping the torque demands low. If I drove the crankshaft directly with the etek on this bike I would have a top speed of 20mph So maybe 3:1 gear ratio going into the transmission. Though the peak hp torque difference is 1.68:1 (the etek has more torque). Dunno if the tranny can handle 68% more torque of direct drive (probably handles a lot more than that when you dump the clutch) but direct would seem to be a bit more efficient if I didn't need an extra chain. edit, I cannot get much above 30mph using common sprockets and direct drive. for maybe 60mph and direct drive into the tranny, I would be looking at a custom rear sprocket with like 15 teeth!! (or use a standard 15 tooth on front and a custom 19 tooth on rear) __________________ WINDMILLS DO NOT WORK THAT WAY!!! Last edited by dcb; 04-09-2011 at 09:34 AM..