All Big Twin Models Tire pressures commonized across models •Lead free wheel weights –this is a running change –the segments will be a different weight •they were 0.25 oz (7 gm) •they now are 0.18 oz (5 gm)
2010 Big Twin Transmission Changes What changed and why? •Helical 5thgear –Has greater thrust loads. •Snap ring groove moved inboard by about 0.90”to add material behind the snap ring. •Moving the groove resulted in a change to the guide hub, adding the counterbore. •The new mainshaft will be used for all replacement parts and transmissions. The mainshaft is retrofitable as a kit that contains the mainshaft, guide hub, snap ring and needle bearing. –Will require the new mainshaft inner primary bearing race. •All replacement transmissions will come with the new mainshaft assembly (with the new gear hub). •Upgrading to helical 5this Not Retrofitable –Results of upgrading to the helical 5thgear •Vehicle Speed slower than indicated by speedometer •The 6thgear light may not function correctly •No plan for new calibration
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2010 Big Twin Transmission Changes What changed and why? •Helical 5thgear –Has greater thrust loads. •Snap ring groove moved inboard by about 0.90”to add material behind the snap ring. •Moving the groove resulted in a change to the guide hub, adding the counterbore. •The new mainshaft will be used for all replacement parts and transmissions. The mainshaft is retrofitable as a kit that contains the mainshaft, guide hub, snap ring and needle bearing. –Will require the new mainshaft inner primary bearing race. •All replacement transmissions will come with the new mainshaft assembly (with the new gear hub). •Upgrading to helical 5this Not Retrofitable –Results of upgrading to the helical 5thgear •Vehicle Speed slower than indicated by speedometer •The 6thgear light may not function correctly •No plan for new calibration
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