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SKU:
NLT1R02312
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355cc Big Bore Cylinder Head & Piston Kit for 2000-2006 Honda Rancher 350 TRX350
$372.99
In Stock
$372.99
Sale price
$372.99
Regular price
This 355cc big-bore cylinder head and piston kit fits 2000-2006 Honda Rancher 350 TRX350FE, TRX350FM, TRX350TE, and TRX350TM models.
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I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Honda Rancher 350 TRX350FE 4x4 ES (2000-2006)
- Honda Rancher 350 TRX350FM 4x4 S (2000-2006)
- Honda Rancher 350 TRX350TE 2x4 ES (2000-2006)
- Honda Rancher 350 TRX350TM 2x4 S (2000-2006)
Product Overview
Low compression, oil smoke, damaged valves, or a scored cylinder can turn a dependable Rancher into an ATV that is hard to start and weak under load. This kit brings the major top-end pieces together for a 355cc repair instead of making you chase mismatched engine parts one at a time.
It is intended for Rancher 350 engines being rebuilt after the top end has been measured and the crankcase, timing components, oiling system, and lower end have been confirmed serviceable. The 78.5 mm piston makes this a big-bore configuration, so compare the removed parts and planned build before ordering.
Key Features & Performance
- 355cc big-bore top-end configuration
- 78.5 mm piston for the listed Rancher 350 engines
- Cylinder head and piston components packaged for one repair
- Useful after a confirmed loss of compression or top-end damage
- Covers manual-shift and electric-shift Rancher variants
Replaces Part Numbers
- 12100-HN5-670
- 12200-HN5-670
- 12200-HN5-M00
- 12251-HN5-671
- 13101-HN5-670
- 13010-HN5-671
- 13111-HC0-000
- 13112-HN5-670
Common Uses
- Rebuilding an engine with low cylinder compression
- Repairing a scored cylinder or damaged piston
- Correcting oil burning traced to top-end wear
- Refreshing a Rancher 350 after valve or head damage
Technical Specifications
- Product Type: 355cc cylinder head and piston kit
- Cylinder Bore: 78.5 mm
- Application: Honda Rancher 350 ATV engine
- Model Years: 2000-2006
- Condition: New
- Replacement Type: Aftermarket
Installation & Fitment
- Perform compression, leak-down, and oil-pressure checks before teardown
- Confirm the bore, piston size, head design, and gasket layout against the removed parts
- Clean the crankcase and oil passages so old debris cannot damage the new top end
- Set ring gaps, cam timing, valve clearance, and fastener torque to the service manual
- Prime the oiling system and follow a proper break-in procedure before heavy load
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application not shown.
Match the TRX350 submodel, 2000-2006 year range, 78.5 mm bore, cylinder height, head layout, and every included gasket to the engine being rebuilt. Model year, production date, serial number, trim, engine, installed options, and previous repairs can affect fitment.
Frequently Asked Questions
Q: Will this fix a Rancher that smokes under load? A: It can correct smoke caused by worn top-end parts, but valve guides, crankcase ventilation, cylinder condition, and the lower end must be diagnosed first.
Q: Does a big-bore kit require careful setup? A: Yes. Ring gap, cam timing, valve clearance, lubrication, and torque values must be set correctly; professional engine assembly is recommended.
Q: What should I compare before ordering? A: Match the TRX350 submodel, 2000-2006 year range, 78.5 mm bore, cylinder height, head layout, and every included gasket to the engine being rebuilt.
Q: Is this supplied by the original equipment manufacturer? A: No. This is a new aftermarket part. Brand names and reference numbers identify fitment only.
Package note: The kit centers on a cylinder head, 355cc cylinder, piston, rings, pin, clips, and top-end sealing parts; compare the listing photos with the parts you need.
Part Summary
keywords: Honda Rancher 350 big bore kit, TRX350 cylinder head replacement, 355cc Rancher piston kit, 2000-2006 TRX350 top end rebuild, Honda ATV low compression repair, Rancher 350 engine rebuild parts
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.