Yamaha IT490 Lectron Big-Air Billetron - 40mm 2-Stroke Carburettor Taylor & Dyna Ignition Leads Complete with rings/buttons and head

Complete with rings/buttons and head gasket

they are made from a superior bronze aluminium material for better wear and heat transfer characteristics compared to the oem guides

5mm Over Size: +2mmComp Ratio: 12:5:1Gram Wt (g): 127Skirt Style: FSR Machined from 2618 T6 high tensile forged aluminium Dome/Dish features smooth flowing radii and require no deburring or preparation JE designs are specifically engineered for extreme applications including Professional competition Pins

These are for the single rocker shim type motors

set rev limts

Yamaha IT490 Lectron Big-Air Billetron - 40mm 2-Stroke Carburettor Taylor & Dyna Ignition Leads Complete with rings/buttons and headThe BILLETRON Big Air is designed specifically to maximize performance in big bore two strokes while continuing in the simplicity and technology of Lectron heritage. Gain peak performance, lose the jets. The BILLETRON Big Air builds on the existing two fuel circuit system of the legacy Lectron products. Continuing with Lectron Metering Rod Technology and the Adjustable Power Jet fuel circuit for top end fuel adjustment, the BILLETRON Big Air