Hey,
My GT is on stock Jet200 gearing:
primary drive: 46/15
1st gear: 12.52: 1
2nd gear: 8.76: 1
3rd gear: 6.30: 1
4th gear: 4.82: 1
28mm Dellorto, breathsweet foam filter + PM tuning Evo pipe.
Pulls like its possessed up through 3rd gear and when I shift into 4th acceleration drops off dramatically. I have digital speedo so I can give RPM where each gear maxes out if that helps.
What should it ideally be?
Thanks in advance
David
seeking recommendation on GT200 gearing
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carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
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I think your pipe is the problem, pm is a revvy pipe but your final drive ratio is better for a pipe that makes more torque, tsr evo or a fresco comes to mind, choice of pipe and final drive ratio go hand in hand. only other option is to get a bigger crownwheel.
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... good response and almost certainly the issue.holty wrote: ↑Thu Apr 25, 2019 7:48 pm I think your pipe is the problem, pm is a revvy pipe but your final drive ratio is better for a pipe that makes more torque, tsr evo or a fresco comes to mind, choice of pipe and final drive ratio go hand in hand. only other option is to get a bigger crownwheel.
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Thanks. So my final drive is 4.8 now, and it would be better at 4.9 with a 47 tooth CW?Adam_Winstone wrote:... good response and almost certainly the issue.holty wrote: ↑Thu Apr 25, 2019 7:48 pm I think your pipe is the problem, pm is a revvy pipe but your final drive ratio is better for a pipe that makes more torque, tsr evo or a fresco comes to mind, choice of pipe and final drive ratio go hand in hand. only other option is to get a bigger crownwheel.
Also, I have a bgm big box clubman on another scooter I could put on this one, what would be the correct final drive rAtio for that?
Tx
David
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carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
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4.9 might be a bit better but ideally you might want to drop it to 5.2 with that pipe.
The clubman might be a good choice on 4.8 what have you got to loose (other than an hour or two) by trying it.
The clubman might be a good choice on 4.8 what have you got to loose (other than an hour or two) by trying it.
"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."
- Doom Patrol
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There's nothing wrong with the gearing. The Jet pulled it okay with a 20mm carb and standard exhaust. Like others have said, it's probably the exhaust that's the issue.
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Tx. Gearing is the only part of the engine I'm not that familiar with. I got offered the PM pipe at 1/3 the price of new so just tried it. Before I do anything else I'll throw the BB clubman on and see how it behaves.
David
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David
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carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
- Burnside
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I'm pulling 4.6 with my GT200 and BGM clubman, Li150 46/17 so it should pull 4.8 comfortablyDavidsquaredson wrote: ↑Fri Apr 26, 2019 7:31 pmThanks. So my final drive is 4.8 now, and it would be better at 4.9 with a 47 tooth CW?Adam_Winstone wrote:... good response and almost certainly the issue.holty wrote: ↑Thu Apr 25, 2019 7:48 pm I think your pipe is the problem, pm is a revvy pipe but your final drive ratio is better for a pipe that makes more torque, tsr evo or a fresco comes to mind, choice of pipe and final drive ratio go hand in hand. only other option is to get a bigger crownwheel.
Also, I have a bgm big box clubman on another scooter I could put on this one, what would be the correct final drive rAtio for that?
Tx
David
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- sean brady scooters
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one of the chiselspeed /adspeed pipes would work well and pull that gearing ..if they still do them ...check with martin for advice though
Sean Brady Scooters - 01765 690 698
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Advice I have been given is Franspeed Race is ideal if it's >200cc, but the Supertourer is a better match for 200cc and my gearbox.
David
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David
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carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200