Dune Goons Complete 4mm Stroker Build Kit - Yamaha Banshee 350
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DUNE GOONS COMPLETE STROKER BUILD. The full top-and-bottom package for a +4mm stroker Banshee, every matched part in one box, including the transmission bearing kit so you refresh the trans while the cases are apart. Save versus buying separately.
✓ Fits
1987-2012 Yamaha Banshee 350 (YFZ350). Stock 64mm bore, +4mm stroker configuration.
✓ What's In This Kit
- Hot Rods +4mm Stroker Bottom End (CBK0044): +4mm stroker crankshaft with +5mm longer rod, main bearing and seal kit, oil seal kit, and complete gasket set
- Vertex Stroker Top End Piston Kit (VTK23607): two cast replica long-rod stroker pistons, top end gasket kit, and two wrist pin bearings, 64mm bore
- Hot Rods Transmission Bearing Kit (TBK0072): primary and secondary shaft bearings, shift drum bearings, output shaft collar and washer, a must-do while the cases are split
- Athena 64mm Nikasil Cylinders (pair): stock-bore replacement cylinders with larger water jackets and triple exhaust ports
- ModQuad Billet Cool Head: 6061 billet aluminum cool head for lower running temps (choose your color below)
- ModQuad Cool Head Domes, 4 Mil Stroker: stroker-spec domes matched to this build
✓ Why This Build
- Everything is matched: the Vertex long-rod pistons are designed for the Hot Rods stroker crank, and the stroker domes are spec'd for the +4mm stroke
- Stays at stock 64mm bore, so it uses standard-bore cylinders and pistons, no big bore machine work needed
- Includes the transmission bearing kit, the smart time to do it is now, with the cases already open
- More stroke means more torque and a harder-hitting midrange, the classic Banshee stroker feel
- Cool head and stroker domes keep temps down and set your squish and compression for the longer stroke
✓ What's NOT Included
- Carburetor jetting changes, reeds, pipes, and clutch work are not included and may be needed to get the most from your build
- Professional assembly is strongly recommended. This is a full engine build
BUILD NOTE: This is a complete engine build kit for experienced builders or professional installation. Correct piston-to-cylinder clearance, ring end gap, squish, and proper break-in are critical. The Hot Rods bottom end top-end gaskets are designed to be used with an OE cylinder head. Reach out to our shop if you want us to build it for you.
Ships fast from DuneGoonShop!
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
