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Cylinder Head Stud Space: 54mm
The CST 10
These are the nicest stainless steel expansion chambers we've seen
seat-of-the-pants power gains without requiring head machining or exotic valve springs
SSP-G QMB139 Clutch Springs Options:1000 Cylinder Head Stud Space: 54mmSSP G Clutch Spring Set for 50cc, 4 stroke QMB139 Engines. Choose from 1000, 1500 or 2000 RPM Sizes. Please Note: Some newer style scooters have a larger spring installed in the stock clutch. Please see Specifications tab to compare measurements to your stock springs. Choose from 1000 RPM (blue), 1500 RPM (yellow), or 2000 RPM (red) springs Overall Length: 31. 5mm Overall Width: 8. 4mm QMB139 50cc 49cc
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