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y0733 Big Scale-EXTREME, adjustable 3 - shoe clutch

Product information "y0733 Big Scale-EXTREME, adjustable 3 - shoe clutch"

With the Big Scale-EXTREME an adjustable clutch for very special requirements has been designed:
  • For large-displacement engines
  • For heavy or high traction cars (Losi, HPI)
  • For modified performance engines
  • For the demanding off-road use


Rapid wear of a clutch is a sign of constant slipping, even beyond engagement speed. In this case, the clutch does not transfer the applied torque.

This is where the Big ScaleEXTREME sets a new standard.
The new design of the "Extreme" prevents the centrifugal forces of clutch springs or lever side of the clutch shoes from counteracting the centrifugal force of the friction pad side even after engagement.
As a result this clutch can transfer lots of power with minimal wear.

The new design ensures that the centrifugal forces are transferred in full to the clutch lining. Precise engagement and disengagement even under high loads and inside of closed clutch bell carriers means no problem for this clutch.

The clutch can be easily adjusted to the engagement speed through three set screws without clutch bell removal, so you can match the characteristics of your engine.

The special clutch lining of the Big Scale-EXTREME is particularly wear-resistant and - especially in combination with a high-quality nitrited clutch bell (), guarantees for an exceptionally long service life! Contrary to the "Cross" or "Race" version there's no need to uninstall the clutch from the engine for maintenance. All parts are easily accessible from the front after removing the front plate.

Please see the specifications tab for further information and handling advices!

The regular price of the Big Scale-EXTREME is EUR 139.90

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y0730 GPM Big Scale-Cross adjustable 3 shoe clutch
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y0731 GPM Big Scale-Race adjustable 3 block clutch
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y0739 GPM Big Scale-ALLOY adjustable 3 block clutch for 1/5 scale On-Road models
regular Price GPM Big Scale - ALLOY 119,90 EUR===================================The Big Scale-ALLOY clutch is equipped with 1.4 mm springs.This version is particularly suitable for on-road use.Adjustable 3-shoe clutch for:Zenoah / Chung Yang / HPI - Fuelie / Smartech PT and many other engines.The GPM-Big Scale clutch:Suitable for racing and for the ambitious hobbyist driver. Unlike the stock clutch, the installed GPM-Big Scale clutch can be adjusted by turning one single screw. A 2.5 mm allen key wrench is required for this application.Therefore it is possible to precisely adjust the clutch engagement depending on track characteristics.Slight aluminum deposits in the clutch bell and corresponding wear marks in the clutch shoes are normal with the Big Scale ALLOY clutch and have no negative effect on the function. Caution: It is very important that when swapping the full-aluminum clutch shoes against the organic friction pads of a Big Scale CROSS or RACE to use a different or new , because the rough surface of the aluminum deposits in the clutch bell left by the Big Scale ALLOY will cause a high wear on the organic pads.

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Accessories / Spare parts

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y0743 Clutch-Safe 10 g, adhesive especially for clutch pads
Special single component epoxy adhesive for bonding clutch shoes; suitable for extreme operating temperatures (up to 200°C!) Important note for processing: For the final cure of the bond Clutch-Safe must be tempered at 170°C for 1 hour! (1 hour at 170°C in the oven!) The extremely high temperature load on the clutch shoes when used in off-road cars caused by increased clutch slippage, the shock of jumps and the combination with sometimes very high vehicle weights (up to 18 kg!) make bonding with Clutch-Safe highly recommended. For later removal/replacement of worn out clutch pads the clutch shoes must be heated as well.Attention:Clutch-Safe adhesive must be stored in the fridge! Content: 10g tube

Content: 10 Gramm (€495.00* / 1000 Gramm)

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y0733/01 Clutch shoes with bonded organic friction pads
Clutch shoes with bonded organic friction pads for BigScale Extreme clutch.

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y0733/02 Extremely wear resistant organic friction pad
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y0733/03 Mounting screws for friction pads and front plate
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y0733/061 Clutch spring green, 1.4 mm, 3 pcs.
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y0733/062 Clutch spring black, 1.5 mm, 3 pcs.
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y0733/063 Clutch spring white, 1.6 mm, 3 pcs.
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y0733/064 Clutch spring orange, 1.7 mm, 3 pcs.
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y0733/065 Clutch spring candy red, 1.8 mm, 3 pcs.
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y0733/07 Adjustment screw M5x7.6 mm, 3 pcs.
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y0733/08 Clutch body
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y0733/09 Front plate
Front plate, spare part for BigScale Extreme clutch.

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