OEM part required 2 classes
Must remain OEM. Timing may be adjusted.
- Runabout Lites · AA.2.3
- Four-Stroke Ski Lites · N.2.3
IHRA · Engine
Aftermarket camshafts
IHRA answers this part for 24 of its classes. 9 of those answers are permissions, with or without limits attached, and 15 are not. 7 are inferred from how the class is written rather than quoted from a rule naming this part.
Where it stands, class by class
24 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.
No rule, this is an open class Our reading, not a rule we can quote at you. This class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms.
OEM part required 2 classes
Must remain OEM. Timing adjustments allowed.
- Runabout GP2 · Y.2.3
- Runabout GP3 · Z.2.3
OEM part required 2 classes
Must remain OEM. Timing may be altered. Adjustable timing sprockets may be installed.
- Ski 1100 Modified · R.2.3
- Ski 1500 Modified · Q.2.3
OEM part required 1 class
Must remain OEM. Timing adjustable within limits; adjustable timing sprockets permitted. · L.2.3
OEM part required 1 class
Must remain OEM. Interchangeable between WaveRunner models. · DD.1
Not permitted, not listed in the rules 4 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
Legal, within limits 1 class
Cam shaft gears may be welded. · W.2.4
Legal 5 classes
Aftermarket permitted.
- Drag, Sea-Doo Pro Stock · DD.2
- Drag, Yamaha Spec · DD.3
- Drag, Sea-Doo Spec · DD.4
- Drag, Super Stock · DD.5
- Runabout GP · X.2.8
Legal 1 class
Four-stroke entries: Aftermarket permitted. · BB.2.3
Legal 1 class
Camshaft count unchanged; original bearing type and dimensions. · K.2.3
Legal 1 class
Four-stroke entries: Camshaft count unchanged, original bearing type and dimensions, activation method unchanged. · V.4.7
No rule, this is an open class 2 classes
The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.
- Drag, Stand Up Unlimited · DD.10
- Drag, Unlimited · DD.6
No rule, this is an open class 1 class
No restriction in section CC, and CC.1 permits any modification it does not restrict.
- Freestyle · CC
Aftermarket camshafts: 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 IHRA class · where the rulebooks differ · signed checks on parts the shop sells.
Engine · four stroke · legal outright in 9 of 24