Yamaha Warrior 350 Valve Adjustment Valve Lash Start to Finish YMF350X How To DIY

Published on March 12, 2022
Duration: 8:33

This guide details the process of adjusting valve lash on a Yamaha Warrior 350 (YMF350X). It covers removing the gas tank and seat, locating the valve covers, setting the engine to Top Dead Center, and using feeler gauges to measure intake (0.06-0.10mm) and exhaust (0.16-0.20mm) valve clearances. The guide also explains how to make adjustments by loosening a lock nut and turning the adjustment head, emphasizing the importance of double-checking after tightening.

Quick Summary

Performing a valve adjustment on a Yamaha Warrior 350 involves setting the engine to Top Dead Center, then using a metric feeler gauge to measure intake (0.06-0.10mm) and exhaust (0.16-0.20mm) valve clearances. Adjustments are made by turning the adjustment head while holding the lock nut, with a final check to ensure accuracy.

Chapters

  1. 00:37Introduction & Prep
  2. 00:51Removing Gas Tank
  3. 02:08Accessing Valve Covers
  4. 02:45Setting Engine to TDC
  5. 03:39Verifying Timing Mark
  6. 04:21Checking Valve Clearance
  7. 06:17Adjusting Valve Clearance
  8. 07:13Exhaust Valve Specs
  9. 07:25Reassembly & Final Checks

Frequently Asked Questions

What are the correct valve clearance specifications for a Yamaha Warrior 350?

For the intake valve, the clearance should be between 0.06mm and 0.10mm. For the exhaust valve, the clearance should be between 0.16mm and 0.20mm. These measurements ensure proper engine operation and prevent damage.

How do I set my Yamaha Warrior 350 engine to Top Dead Center (TDC) for valve adjustment?

To set TDC, remove the inspection port cap and use a socket to turn the crankshaft clockwise until the 'T' mark aligns with the notch in the threads. Then, remove the timing inspection cover to confirm the timing mark aligns with the triangular indicator.

What tools are needed for a Yamaha Warrior 350 valve adjustment?

You'll need basic tools like allen wrenches, socket sets (including 10mm and 11/16), a flathead screwdriver, needle-nose pliers, and crucially, a metric feeler gauge set, preferably with bent tips for easier access.

What is the proper feel for checking valve clearance with a feeler gauge?

The feeler gauge should slide into the gap with slight resistance. If it slides in with no resistance, the valve lash is too loose. If you have to force it, it's too tight. The goal is a smooth, slight drag.

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