Multiquip 90206001000 Tappet Adjusting Nut GX100 HC-0004598

The Multiquip 90206001000 is a genuine OEM Tappet Adjusting Nut GX100 HC- designed for MTX and MTR series rammers as well as the MVC40H plate compactor. As a direct Multiquip OEM component, part 90206001000 is manufactured to the exact specification required for correct valve clearance adjustment on GX100-powered equipment. This nut is confirmed compatible with the MTX50HD, MTX60HD, MTX60HF, MTX70HD, MTX70HDR, MTX70HF, MTX80HDR, MTR40HF, and MVC40H. Sourcing a genuine OEM part ensures the locking nut seats and torques correctly without the risk of thread mismatch or improper retention.

Key Features

• Genuine OEM Thread Integrity — Manufactured to exact Honda GX100 thread pitch and dimensional spec, so the nut engages the rocker arm stud without risk of cross-threading or stripping.
• Correct Valve Clearance Lock — Locks the tappet adjustment screw at the set clearance value, preventing the adjustment from drifting under the vibration loads typical of rammer and plate compactor operation.
• Broad GX100 Family Fitment — Fits MTX50HD, MTX60HD, MTX60HF, MTX70HD, MTX70HDR, MTX70HF, MTX80HDR, MTR40HF rammers and the MVC40H plate compactor.
• Vibration-Resistant Retention — A correctly torqued tappet nut on high-cycle compaction equipment prevents valve clearance creep that leads to hard starting, power loss, and premature valve wear.
• Direct OEM Replacement — Installs with standard hand tools in place of the original nut; no re-drilling, rethreading, or adapter hardware needed.

The tappet adjusting nut is the locking nut that secures the valve clearance adjustment screw on the rocker arm of a four-stroke engine. Once the correct gap between the rocker arm and valve stem is set using the adjustment screw, this nut is tightened against the rocker arm to hold that setting in place. On rammers and plate compactors — equipment that operates under continuous, high-frequency vibration — a worn, stripped, or incorrectly sized tappet nut will allow the adjustment to back out over time. This results in incorrect valve timing, which commonly presents as difficult starting, rough running, loss of compaction force, and, if left uncorrected, accelerated valve and cylinder head wear.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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