seeking recommendation on GT200 gearing

[Davidsquaredson]

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

[holty]

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.

[Adam_Winstone]

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.

... good response and almost certainly the issue.

[Davidsquaredson]

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.

... good response and almost certainly the issue.

Thanks. So my final drive is 4.8 now, and it would be better at 4.9 with a 47 tooth CW?

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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[rosscla]

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.

[Doom Patrol]

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.

[Davidsquaredson]

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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[Burnside]

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.

... good response and almost certainly the issue.

Thanks. So my final drive is 4.8 now, and it would be better at 4.9 with a 47 tooth CW?

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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I'm pulling 4.6 with my GT200 and BGM clubman, Li150 46/17 so it should pull 4.8 comfortably

[sean brady scooters]

one of the chiselspeed /adspeed pipes would work well and pull that gearing ..if they still do them ...check with martin for advice though

[Davidsquaredson]

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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