Counter Gear Case Upgrade for GPH 346 GT - HI0403303 Hirobo  [HI0403303]

HIROBO 0403-303 GPH 346 GT COUNTER GEAR CASE FOR BELT DRIVE #0403303
Price:
AUD$15.90
Brand:
Hirobo
Model:
HI0403303
GTIN:
4512895118730
Condition:
Brand New
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Tuning and Belt Routing Benefits

The Hirobo HI0403303 is a replacement counter gear case intended for belt-driven GPH 346 GT assemblies; it houses the counter gear and manages the belt path through the drivetrain. By providing a firm mounting surface, the case helps reduce unwanted lateral movement that can destabilise belt tracking and influence drivetrain response.

From a tuning standpoint, installing a correctly aligned case makes belt tension and mesh more repeatable after service or repairs. During installation inspect belts and bearings for wear, ensure the case is fully seated, and confirm smooth free rotation of the transmission before conducting tuning flights.

Will this change my belt tension settings?

Installing a new HI0403303 case restores the original belt routing, which can make your established tension settings behave more predictably. Re-check tension after fitting to account for slight differences in seat and alignment.

Does the gear case affect flight trim?

A stable and correctly aligned case reduces drivetrain backlash and belt slippage, which can remove a variable from trim setup. Confirm drivetrain smoothness on the bench and then fine-tune trim in short test flights.

Any tips for getting the best tuning result?

After replacing the case, perform a step-by-step check: bearings, belt wear, case seating, then run the drivetrain at low speed to confirm mesh before full-power tuning tests. Consistent bench checks lead to more repeatable flight behaviour.

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