IJSBA · Forced induction

Supercharger rebuild internals, clutch, belt, pulleys

The commercially important tier below a whole blower.

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter, and where both govern you, you are held to the stricter of the two. The differences are set out in the rulebook comparison.

Runabout Stock is the money case: IJSBA-approved aftermarket internals are legal, OEM gear ratio is not negotiable. Flag the approval status per SKU.

Where it stands, class by class

14 classes, grouped by the answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

Not permitted, not listed in the rules Our reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.

OEM part required 1 class

No modifications to the turbo/supercharger system.

• Runabout Naturally Aspirated · RNA

Not permitted, not listed in the rules 6 classes

Not listed in this class document. Illegal under the closed-list principle.

• Fixed Steering Ski Stock · FSSK
• Runabout Rec Lites · RRL
• Ski Stock · SSK
• Four Stroke Ski Lites · FSKL
• Ski Modified · SKM
• Ski Superstock · SKSS

Legal, within limits 1 class

Clutches, belts and internal replacement parts need not be OEM provided they are IJSBA-APPROVED, and OEM gear ratios must be maintained. Shafts may be welded or reinforced FOR SAFETY PURPOSES only. · RAS.9.2

• Runabout Stock

Legal 5 classes

Explicitly permitted by this class document.

• Runabout Superstock · RSS
• Freestyle · FREST
• Ski Grand Prix · SKGP
• Sport GP · SPGP
• Runabout Open / GP · ROP

Legal 1 class

ALL internal supercharger or turbocharger parts may be modified or aftermarket. Pulleys and tensioners too. A spacer may be used to fit a larger impeller. · RAL.5.1

• Runabout Limited

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Supercharger rebuild internals, clutch, belt, pulleys: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.

Every IJSBA class · where the rulebooks differ · signed checks on parts the shop sells.