12-01-2015, 12:50 AM | #16 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Now that's a real gear box.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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12-01-2015, 10:45 AM | #17 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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Thank you again, Brother. Happy to be back and grateful for the (re)welcome home.
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12-01-2015, 10:50 AM | #18 | |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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Quote:
What bike does that transmission go to?
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12-01-2015, 10:51 AM | #19 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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Do any other machines use motorcycle transmissions?
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12-01-2015, 11:49 PM | #20 |
Join Date: Jul 2015
Location: Milpitas, CA. USA
Posts: 775
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That was the Suzuki RP68, a liquid cooled three cylinder 50cc. A web search should show you more. I think their power peaked about 19,000rpm. I understand there were also rumors of 15 and 16 speed boxes.
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07-02-2018, 11:41 PM | #22 |
Join Date: Jun 2017
Posts: 382
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Gear ratios:
1st 2.583333 2nd 1.80000 3rd 1.33333 4th 1.10000 5th 0.958333 6th 0.880000 Excellent ratios for a very thin power band, high revving, high peak output engine. If you want a race or café or sport engine, this is a good set of gears, and I expect tweeking the RX3 up to about 35hp, maybe more, this trans won't run out of practical gear usage. I've had that problem with some race engines I've built--the more peak the narrower the power band. RPM from 9000 at each shift: 1st-2nd 6279 2nd-3rd 6650 3rd-4th 7427 4h-5th 7840 5th-6th 8264 These ratios are too close to take maximum advantage of the limited power band of a brand new engine with a horsepower peak of 9000rpm and a torque peak of 8000rpm. For instance, the XT225 transmissions in two of my TWs have a 3.090 1st and a 0.793 6th. One of my TWs has a TT230R trans, 2.92 1st and 0.793 6th. The XT trans ratios are 1st 3.090 2nd 2.0 3rd 1.428 4th 1.125 5th 0.925 6th 0.793 RPM from 9000 at each shift XT: 1st-2nd 5825 2nd-3rd 6426 3rd-4th 7090 4h-5th 7400 5th-6th 7716 I believe a broken in stock engine would pull those ratios just fine, what with its extra 25cc. There is plenty of power band, just have to be a little more aware of what gear the trans needs to be in--you'll only have 2 gears to choose from rather than 3 or 4. BUT, reconfigure the final drive to the same overall ratio we have now and we will have a granny for pulling a substantial adventure load into some relatively remote areas. Gears similar to the XT ratios would better suit my riding, even with the 300cc bore kit. I'd like to go to more aggressive knobbies but worry about the clutch pulling a taller tire. |
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