Not permitted, not listed in the rules 2 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Ignition
Ignition timing adjustment or trigger plate, IHRA
IHRA answers this part for 15 of its classes. 3 of those answers permit the part outright and 5 permit it with stated conditions, leaving 7 that do not. 4 of the ones that do not are classes we read as open rather than as refusing it. 7 are inferred from how the class is written rather than quoted from a rule naming this part.
Where it stands, class by class
15 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.
What each answer below means
- Not permitted, not listed in the rules
- Treat it as coming off. The class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list, so this is our reading rather than a rule we can quote at you.
- Legal, with conditions
- Keep it, but measure it: the rules permit this part only inside stated limits.
- Legal
- Keep it. The rules permit this part in this class.
- No rule, this is an open class
- Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.
Not permitted, not listed in the rules 1 class
DD.7 states no engine type, so a two-stroke entry cannot be ruled out, and DD.7 does not list this part, so under the DD preamble it is not legal on either engine. · DD.7
Legal, with conditions 1 class
Two-stroke entries: Alterable by adjusting the ignition trigger mounting plate. · Z.7.2
Legal, with conditions 1 class
Adjustable by slotting the ignition trigger mounting plate; adapter plate may relocate the trigger. · O.4.2
Legal, with conditions 1 class
On the Kawasaki 750SX, 750SXI, 750SXI Pro and SXR800 the trigger plate holes may be modified or a timing advance plate added, for advancing only. · M.6.1.2
Legal, with conditions 1 class
P.2.5 permits ignition timing adjustment and modification of the original ignition pickup mount, beyond the trigger-plate slotting and adapter plate of O.4.2, while the original equipment charging system must stay. · O.4.2, P.2.5
Legal, with conditions 1 class
On a two-stroke entry BB.8.1 permits ignition timing adjustment and modification of the original ignition pickup mount, while the original charging system stays. · BB.8.1
Legal 1 class
Ignition timing may be altered and the ignition pickup mount modified, with no limit on the advance stated. · T.4.2
Legal 1 class
The ignition system may be modified or replaced with aftermarket parts, which takes in the trigger plate and timing, and no timing limit is stated. · S.4.2
Legal 1 class
V.7.2 opens the whole ignition system to modification or aftermarket parts, which takes in the trigger plate and timing, and the class states no timing limit. · V.7.2
No rule, this is an open class 3 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, 2 Stroke Unlimited · DD.12
- 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
Ignition timing adjustment or trigger plate: 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 · checks on parts the shop sells · how this site reads a rulebook.
Ignition · two stroke · legal in 8 of 15 answered, 5 with conditions