
QuadBoss · Clearance
QuadBoss Yamaha YFM250/YFM350/YFM400/YFM660 Air Cut-Off Valve Kit
MPN 420588 · Store SKU qbs420588
Supplier stock checked 11/7/2026, 7:24:37 AM UTC. Adding a part does not reserve it.
Clearance and scratch-and-dent parts are final sale. No returns or refunds.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
Improperly functioning air cut-off valves can stick open or closed, causing poor running conditions and popping during deceleration. Air Cut-Off Valve Kit includes O-rings, diaphragm, spring and screws necessary to rebuild the air cut-off valve circuit. QuadBoss 420588 Carburetor Air Cut-Off Valve Kit
Manufacturer fitment & guides
Check 420588 against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- Clearance item. All sales are final under the supplier clearance policy.