OEM part required 5 classes
This class requires the OEM part.
- Fixed Steering Ski Stock · FSSK
- Runabout Rec Lites · RRL
- Ski Stock · SSK
- Four Stroke Ski Lites · FSKL
- Runabout Naturally Aspirated · RNA
IJSBA · Fuel
Aftermarket or modified throttle body
A sharp discriminator between Superstock and Open/GP.
Runabout Superstock keeps the stock throttle body even though the whole exhaust and turbo can be aftermarket. Easy to get wrong.
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.
OEM part required 1 class
Throttle bodies must remain stock. No throttle plate angle change, no housing modification, NO PHENOLIC OR ALUMINIUM SPACERS behind the throttle body. · SKM.5.2
OEM part required 1 class
Stock as supplied. No plate angle change, no housing modification, no spacers behind it. · RAL.5.3
OEM part required 1 class
Stock as supplied. No plate angle change, no housing modification. · RSS.5.3
The rules do not say 1 class
Throttle body rules are not stated separately in · RAS
Legal 1 class
Modified or aftermarket, butterfly count up to the number of cylinders. · SKSS.5.3
Legal 1 class
Explicitly permitted by this class document.
- Freestyle · FREST
Legal 1 class
SKGP.8.3
- Ski Grand Prix · SKGP
Legal 1 class
SPGP.6.3
- Sport GP · SPGP
Legal 1 class
Modified or aftermarket; butterflies may be increased up to the cylinder count.
- Runabout Open / GP · ROP
Aftermarket or modified throttle body: 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.
Fuel · four stroke · legal outright in 5 of 14