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Pulley 19x15
Engineered as a high-performance 80/20 dual-sport tire
This is a great upgrade for your bone stock or high performance engine
This OEM replacement crankshaft assembly fits 139QMB engines with 16 tooth oil pump drives
NCY Compression Spring (Performance); 139QMB Options:2000 RPM Pulley 19x15NCY compression spring for 50cc 139QMB engines. Available in 1k, 1. 5k, and 2k rpms. Compression springs do a couple of things. First they supply the pressure to engage the belt. They also determine the rate at which the CVT transmission changes from low to high gear. A 1000rpm spring will go into a higher gear than a 2000rpm spring. Specifications: Wire Diameter: 4. 0mm Inner Diameter: 49. 0mm Length: 106. 0mm Available in 1k, 1. 5k, and 2k rpms
US$ 105.00
US$ 59.99
