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Small metal clutch sprocket drum with seven teeth on a plain background

LAHDEK

LAHDEK 325 Pitch 7 Tooth Clutch Sprocket Drum Husqvarna 340 345 350 445 450

SKU CH-RVGN-162N1

A 325 pitch, 7-tooth clutch sprocket drum that fits Husqvarna 340, 345, 350, 445 and 450 chainsaws and replaces OEM 578097901

  • .325" pitch 7-tooth drum fits Husqvarna 340 345 350 445 450 saws
  • Direct OEM replacement for part 578097901 ensures correct fit
  • 7-tooth design maintains factory chain speed and torque
  • New condition guarantees unworn splines and bearing surface
  • Petrol two-stroke compatibility matches original equipment specification

Clutch sprocket drum for Husqvarna chainsaws

This replacement clutch sprocket drum fits Husqvarna 340, 345, 350, 445 and 450 models. It matches a 325 pitch with seven teeth for the drive sprocket. The part replaces OEM reference 578097901 and suits petrol-powered, two-stroke single-cylinder saws. Supplied as a single drum ready for installation.

When to replace a worn drum

A damaged or rounded sprocket tooth profile causes chain slip and accelerated chain wear. Swapping the drum restores positive drive engagement and protects the chain from premature stretch. The upgrade is worth it when the original drum shows visible tooth deformation or the clutch engages unevenly under load. No other clutch components are included.

Build fit and chain compatibility

The drum mounts directly onto the existing clutch assembly on the listed Husqvarna models. It requires a 325 pitch chain with a matching drive-link count for correct tension. Using the correct pitch maintains proper sprocket-to-chain alignment and reduces vibration. Builders needing a different tooth count or pitch must select an alternative drum.

How it compares

Measured against everything we stock in Small Engines & Engine Parts, at today’s prices. Recalculated every night.

Price $25.99
Cheaper than about 70% of the 501 comparable items (median $28.99).

Specifications

No published specifications for this item yet.

Questions about this item

Will the 325 pitch 7 tooth drum fit the crankshaft on a Husqvarna 345?

Yes, the drum is built for Husqvarna 340, 345, 350, 445 and 450 models and replaces OEM 578097901 directly.

What tool is needed to remove the old clutch drum and fit the new one on a 350?

A clutch removal tool matched to the Husqvarna flywheel nut is required; the common mistake is turning the nut the wrong way — it loosens clockwise.

How often should the 7 tooth sprocket be inspected on a 450 saw?

Check the sprocket teeth every chain change; replace the drum when the tooth profile shows visible hooking or the drive links no longer seat cleanly.

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