Not legal1 part
Bolts, nuts and washers may not be substituted with titanium unless originally equipped. Locking mechanisms are allowed. J.7
- Titanium fasteners · Engine
IHRA · drag
Drag, Unlimited
IHRA 2026, DD.6. An open class. It carries no clause requiring the craft to stay stock, so anything the rules do not restrict appears to be permitted. That reading is ours rather than the rulebook’s.
Read out of the published IHRA rulebook on 2026-09-11, so confirm anything that decides a purchase. The full note is at the foot of the page.
Running the class
- Eligible craft
- Must be a personal watercraft. The rulebook describes the class in its own words as "basically run what you brung".
- Displacement limit
- None. The class states two rules in total.
- Licence or tier
- Not stated.
- Minimum weight
- Not stated.
Read from the same class section as the part answers. The rider side of the sport, tiers, ages, licences and what gets inspected, is set out across the bodies at Racing.
Places where the rulebook contradicts itself, or where a figure could not be settled. Nothing in this list is decided, and it sits here rather than in a footnote because it is what you would want before spending money.
- This class is recorded as open-list because its own description is run what you brung and it states only prohibitions. That sits directly against the DD preamble, which says anything not listed is not legal. Reading the preamble literally would make a class advertised as unlimited the most restricted in the rulebook. The contradiction is in the document and is not resolved here.
Confirmed absent by a targeted read rather than merely unnoticed. In a closed-list class an absent article is why a part reads as not permitted; in an open class it is why one reads as open.
- Everything. There is no engine article, no fuel article, no ignition article, no pump article and no safety article specific to this class. The general regulations in sections I and J still apply to it.
What the rules say (80 parts)
7 permitted outright, 12 permitted with stated conditions, 1 refused by a rule we can quote and 60 left open by our reading of the class rather than by a quoted permission. Grouped where the same rule gives the same answer, so two "Not legal" groups can sit side by side under different rules. An open class gives one answer to most questions, and printing it once per part would say the same sentence forty times.
What each answer below means
- Not legal
- This comes off. The rules refuse it in this class.
- 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.
Read the refusals as a list of work. Anything below marked Not legal, OEM part required, or Not permitted has to come off the machine, or go back to the standard part, before it races in this class.
Legal, with conditions1 part
Must fit the original battery box and be securely fastened. J.9
- Aftermarket or relocated battery · Electrical
Legal, with conditions1 part
Repairs are allowed for a crack or puncture, but only one damaged area affecting one cylinder bank. No other modification. J.11
Legal, with conditions1 part
May be modified or replaced with an aftermarket part. The original diameter must be maintained in Stock class, and the rulebook never defines which classes that is. J.18.2
- Aftermarket impeller · Driveline
Legal, with conditions1 part
May be replaced within OEM specifications. J.18.3
- Replacement wear ring · Driveline
Legal, with conditions1 part
Aftermarket or modified, full-length type with at least one bar parallel to the driveshaft, dropping no more than 12.00mm (0.47 in) below the flat plane of the pump intake. J.18.1
- Aftermarket intake grate · Driveline
Legal, with conditions1 part
Aftermarket or modified. An extension may not exceed the width of the original plate, and on a ski may not extend more than 100 mm (3.94 in). J.18.1
- Aftermarket ride plate · Driveline
Legal, with conditions1 part
Replacement trim plates may be used provided they mimic the handling characteristics of the stock plates. J.18.2
- Replacement trim plates · Driveline
Legal, with conditions1 part
Braking devices may be disabled for safety, and reverse buckets and trim motors may be removed or modified to disable them, provided no hazard is created. J.18.4
- Reverse bucket or brake removal · Driveline
Legal, with conditions1 part
Must be a PWC. DD.6
- Aftermarket hull · Hull and handling
Legal, with conditions1 part
Aftermarket, modified, repositioned or removed. Up to two, each no longer than 36 in (91.45 cm), protruding no more than 3.94 in (100 mm) horizontally, at least 6 mm thick with radiused leading edges, and not attached to a planing surface. J.16
- Aftermarket sponsons · Hull and handling
Legal, with conditions1 part
Replacement bumpers and side rails may be used provided they create no hazard. A permanently affixed nose bumper remains required. J.13, I.17
- Replacement bumpers and side rails · Hull and handling
Legal, with conditions1 part
May be added to adjust handling. Constant mass only, and no other part may be modified to carry it. J.19
- Ballast weight · Hull and handling
Legal1 part
Any gauges are allowed anywhere on the PWC. DD
- Aftermarket gauges and data logging · Electrical
Legal1 part
Named in the general maintenance allowance along with wiring, hoses and clamps. J.7
- Spark plugs, wiring, hoses and clamps · Electrical
Legal1 part
May be replaced. J.8
- Replacement starter motor · Electrical
Legal1 part
May be replaced, as may starters and oil injection systems, with the oil injection system removable or disconnectable. J.8
- Replacement engine mounts · Engine
Legal1 part
Grips, throttle and cables may be modified or aftermarket. The bar must be padded at the mounting bracket or the crossbar padded. J.17.1
- Handlebars, grips and controls · Hull and handling
Legal1 part
Steering shaft, holder, handlebar holder and cables may be aftermarket, and quick-turn modifications are allowed. J.17.2
- Steering shaft, holder and cables · Hull and handling
Legal1 part
The bilge pump may be modified or disconnected and aftermarket bilge draining systems are permitted, provided they create no hazard. J.10
- Aftermarket bilge draining system · Cooling
No rule, this is an open class60 parts
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.
- Aftermarket expansion chamber / tuned pipe (2-stroke) · Exhaust
- Water-injected (wet) exhaust pipe · Exhaust
- Aftermarket head pipe and exhaust manifold · Exhaust
- Aftermarket or modified waterbox · Exhaust
- Stinger diameter reducing insert · Exhaust
- Relocated or aftermarket through-hull outlet · Exhaust
- Exhaust restrictor plate removal · Exhaust
- Aftermarket carburetor · Fuel
- Carburetor jets, needle valves and springs · Fuel
- Aftermarket reed valve assembly · Fuel
- Aftermarket or modified rotary valve · Fuel
- Aftermarket intake manifold · Fuel
- Aftermarket flame arrester · Fuel
- Aftermarket air intake or cold air system · Fuel
- Airflow sensor modification or removal · Fuel
- Aftermarket throttle body · Fuel
- Aftermarket fuel injectors · Fuel
- Aftermarket electric fuel pump · Fuel
- Aftermarket or substituted fuel tank · Fuel
- High-pressure fuel line and fittings · Fuel
- ECU reflash or reprogramming · Ignition
- Aftermarket or standalone ECU · Ignition
- Aftermarket CDI ignition (2-stroke) · Ignition
- Ignition timing adjustment or trigger plate · Ignition
- Aftermarket or lightened flywheel · Ignition
- Aftermarket boost sensor · Ignition
- Aftermarket wiring harness or connectors · Electrical
- Aftermarket pistons · Engine
- Aftermarket or modified crankshaft assembly · Engine
- Aftermarket connecting rods · Engine
- Aftermarket or swapped cylinder (2-stroke) · Engine
- Aftermarket cylinder head (2-stroke) · Engine
- Cylinder head work (4-stroke) · Engine
- Engine block substitution · Engine
- Aftermarket camshafts · Engine
- Aftermarket valves · Engine
- Aftermarket valve springs and retainers · Engine
- Aftermarket or thicker head gasket · Engine
- Base gasket thickness change · Engine
- Aftermarket turbocharger · Forced induction
- Aftermarket supercharger · Forced induction
- Supercharger internals, clutch and pulleys · Forced induction
- Aftermarket intercooler · Forced induction
- Nitrous oxide system · Forced induction
- Aftermarket pump housing and stator vanes · Driveline
- Aftermarket or bored pump nozzle · Driveline
- Aftermarket driveshaft and couplers · Driveline
- Titanium driveshaft · Driveline
- Adjustable or rider-controlled trim tabs · Driveline
- Aftermarket or modified top deck · Hull and handling
- Aftermarket hood · Hull and handling
- Aftermarket bulkhead · Hull and handling
- Flotation foam removal · Hull and handling
- Ventilation tubes and vent sealing · Hull and handling
- Aftermarket seat · Hull and handling
- Aftermarket seat cover · Hull and handling
- Aftermarket handle pole · Hull and handling
- Aftermarket cooling lines and fittings · Cooling
- Modification of the OEM hull · Hull and handling
- Hull extension · Hull and handling
IHRA 2026, DD.6, read from the rulebook on 2026-09-11. Read the rule yourself, Drag, Unlimited. Every IHRA class · where the rulebooks differ · how this site reads a rulebook.
This is one class. Every part below also has a page of its own showing where it stands across every class this body runs, and legality by part is the index of them.
- Aftermarket handle pole. Corrected 2026-10-07: the Drag Unlimited row called the part not applicable to a seated class; the class says only that it must be a PWC.
Cite this page
“Drag, Unlimited, IHRA class rules”, BaddJet archive, https://baddjetarchive.com/legality/ihra/drag-unlimited/
Add the date you read it.
80 parts read · 7 permitted, 12 with conditions · 2026 rulebook