Main Large Bearing; Most Largeframe Vintage Vespas gtv300 When upgrading to extreme big-bore

When upgrading to extreme big-bore kits (such as 61mm or 63mm cylinders)

Dimensions: Approx

NCY Yamaha Zuma125 66mm Cast Iron Cylinder w/o head

VS5*      Vespa GS 150                    58 - 61  150        Large Frame - 10 in

BN161QMK-A TUNING REQUIREMENT: Upgrading to a high-flow

Main Large Bearing; Most Largeframe Vintage Vespas gtv300 When upgrading to extreme big-boreLarge crankshaft bearing. Fits clutch side for all models, except small frames. This is also the flywheel side bearing for VNA, VNB, VBB, VBA, VLB, VLA, VBC, VNC, VB1, VS5 and VL1 VL3, so, for those, models you'll need 2. On P series scooters, use 133068 for the flywheel side bearing. And, if you've already torn your engine apart, why not replace the rear hub bearing while you're in there? (Part # 90025).