Engine room

Build the motor on paper first.

Compare tradeoffs, flag likely class conflicts, and see parts plus labor before an engine comes apart.

Supersport-style: Production-based engine with selected blueprinting and top-end changes.

Power curve lab

See where the build wins—and where it gives power back.

The shaded band is the RPM range this track and gearing are likely to use. Compare the stock curve with your selected engine package.

Track character
Final gearingBaseline
More top speedMore drive / RPM
Estimated working window
9,000–14,000 rpm
Average in usable range
+7.5 hp
Biggest win
+7.9 hp @ 11.5k
Weakest point
+6.7 hp @ 9.0k
ECU calibration + dyno tune

Broad gain, strongest through the midrange and upper throttle maps.

High-flow race air filter

Small gain at high airflow; little change below the midrange.

Competition valve job + head refresh

Restored sealing gives a modest, usable gain across the working range.

Illustrative modeled wheel-horsepower curves—not measured dyno data. Actual results vary with bike, fuel, correction factor, weather, dyno type, parts combination, and tuner.

Available work

Choose engine modifications

4 selected

ECU calibration + dyno tune

ConditionalAir & fuel

Fuel, ignition, throttle, and engine-braking calibration on a load-bearing dyno.

Pros
  • • Best power-per-dollar foundation
  • • Improves throttle response
  • • Can correct lean fueling after airflow changes
Cons
  • • Quality depends heavily on the tuner
  • • Aggressive limits can reduce engine life

ECU hardware/software and strategies must match the current technical rules.

$700–$1,450
+2–7 hp

High-flow race air filter

ConditionalAir & fuel

Reusable high-flow panel filter in the standard airbox location.

Pros
  • • Low cost
  • • Easy service access
  • • Supports later tuning work
Cons
  • • Small gain by itself
  • • Race filters may trade filtration for airflow

Airbox and filter construction may be controlled.

$90–$280
+0–2 hp

Velocity stacks

ConditionalAir & fuel

Revised intake trumpet lengths to shift torque toward the desired RPM range.

Pros
  • • Shapes the power curve
  • • No internal engine work
  • • Useful for track-specific RPM ranges
Cons
  • • Can move power rather than add it
  • • Needs tuning to realize the benefit

Only permitted configurations or dimensions may be used.

$400–$1,000
+1–4 hp

Competition valve job + head refresh

ConditionalCylinder head

Leak-down inspection, valve-seat service, seals, and controlled seat blending.

Pros
  • • Restores sealing and consistency
  • • Good preventive work on a high-hour engine
  • • Provides a reliable baseline
Cons
  • • Requires engine removal on many bikes
  • • Seat/profile work can cross class limits

Valve-seat angles, port cleanup, and material removal are specifically controlled.

$1,450–$3,100
+1–4 hp

Cam timing / degreeing

ConditionalCylinder head

Measures and adjusts cam timing to optimize cylinder filling and power delivery.

Pros
  • • Uses the existing cams
  • • Can improve midrange or top end
  • • Pairs well with a tune
Cons
  • • Labor intensive
  • • Reduced clearances require careful measurement
  • • Poor setup risks contact damage

Adjustment method and stock cam requirements vary by rule set.

$850–$1,900
+2–6 hp

Ported cylinder head

Not legalCylinder head

Intake and exhaust port reshaping, flow development, and chamber cleanup.

Pros
  • • Strong high-RPM potential
  • • Can improve volumetric efficiency
  • • Tailored to the full engine package
Cons
  • • Expensive
  • • Builder quality is critical
  • • Shortens refresh intervals when paired with higher RPM
$2,300–$4,900
+5–12 hp

High-compression pistons

Not legalBottom end

Forged pistons that raise compression and typically require careful fuel selection and tuning.

Pros
  • • Adds torque across the range
  • • Freshens rings and sealing
  • • Strong base for a full race engine
Cons
  • • May require race fuel
  • • More heat and cylinder pressure
  • • Major teardown and frequent inspection
$2,500–$5,000
+4–10 hp

Blueprint, bearings + rotating assembly balance

ConditionalBottom end

Measured clearances, selected bearings, crank inspection, and rotating assembly balancing.

Pros
  • • Improves consistency at sustained RPM
  • • Catches wear before failure
  • • Supports a complete race build
Cons
  • • High labor cost
  • • Little headline horsepower
  • • Some blueprinting operations are class-restricted

Blueprinting is allowed only within specified tolerances and procedures.

$2,250–$4,800
+0–3 hp

Cooling system race prep

ConditionalReliability

Radiator inspection, race-safe coolant, hoses, cap, and optional high-capacity radiator.

Pros
  • • Controls heat over long sessions
  • • Reduces coolant-system failure risk
  • • Race-safe fluid supports tech compliance
Cons
  • • Oversize radiators add cost
  • • Water-based coolant needs freeze protection off-season

Radiator and hose allowances vary.

$270–$1,350
+0–0 hp

Millennium Technologies CNC head port

Not legalCylinder head

Send-in CNC port program with matched valve job and flow testing from Millennium Technologies.

Pros
  • • Repeatable CNC-matched port shapes
  • • Includes valve job and flow data
  • • Documented program supports tech inspection
Cons
  • • Engine teardown and shipping required
  • • Most aggressive programs are not class-stock
  • • Best gains need a tune and matched exhaust

CNC porting of the stock head is typically prohibited.

$2,300–$4,000
+6–11 hp

Extrude Hone abrasive flow port polish

Not legalCylinder head

Abrasive-flow machining smooths intake/exhaust ports and removes casting flash for higher flow.

Pros
  • • Uniform surface finish across all ports
  • • Lower cost than full CNC porting
  • • Keeps the as-cast port shape
Cons
  • • Less shape change than CNC porting
  • • Hard to verify visually at tech
  • • Removed material is permanent

Any material removal from ports is generally not allowed.

$900–$2,000
+2–5 hp

Ferrea / Kibblewhite valves + seats package

Not legalCylinder head

Race valves, springs, retainers, and seat work from suppliers such as Ferrea or Kibblewhite.

Pros
  • • Supports higher RPM without valve float
  • • Improves seat sealing and durability
  • • Required upgrade alongside aggressive cams
Cons
  • • Major teardown and machining
  • • Spring pressure increases cam and follower wear
  • • Stock-valve classes will not allow it

Valves, seats, and springs are typically stock-only.

$2,000–$3,900
+3–7 hp

Stage 1 race camshafts (Web Cam / Megacycle)

Not legalCylinder head

Mild regrind / billet cams with slightly more lift and duration aimed at midrange and top-end recovery.

Pros
  • • Broader power than stock cams
  • • Works with stock valve springs in many engines
  • • Good match for ECU tune + exhaust
Cons
  • • Requires re-degree on the dyno
  • • Adds wear vs. stock cam profile
  • • Not legal in stock-cam classes

Aftermarket cam profiles are typically prohibited.

$1,600–$3,200
+3–7 hp

Stage 2 high-lift race camshafts

Not legalCylinder head

Aggressive race profile with high lift and long duration; targets peak power above the stock RPM band.

Pros
  • • Strongest top-end gain of the cam options
  • • Pairs well with ported head and high-comp pistons
  • • Moves peak power higher in the RPM range
Cons
  • • Loses low-RPM drive and rideability
  • • Requires upgraded valve springs and clearance check
  • • Shorter service intervals

High-lift profiles exceed allowed lift/duration in nearly every rule set.

$2,500–$4,500
+5–12 hp

EDR Performance billet DLC race camshafts

Not legalCylinder head

Billet CNC race camshafts with DLC coating, adjustable timing gears, and matched valve springs from EDR Performance.

Pros
  • • DLC coating reduces friction and wear
  • • Billet cores are stronger than regrinds
  • • Includes adjustable gears for precise timing
  • • Documented programs for tech inspection
Cons
  • • Premium price over stage cams
  • • Requires full engine teardown and degreeing
  • • Aggressive profiles need matching valve train
  • • Shortens service intervals significantly

Billet race profiles with DLC coating are prohibited in stock-cam classes.

$3,800–$5,800
+6–14 hp

EDR Performance forged high-compression pistons

Not legalBottom end

Forged high-compression or overbore piston kits from EDR Performance with rings and wrist pins.

Pros
  • • Forged construction handles higher cylinder pressure
  • • Overbore options add displacement
  • • Better ring seal and durability vs cast
  • • Supports aggressive cam and RPM packages
Cons
  • • Major engine teardown required
  • • May need race fuel depending on compression
  • • Overbore limits future bore sizes
  • • Piston-to-valve clearance must be verified

Bore, stroke, and compression are tightly controlled.

$3,200–$5,700
+5–12 hp

Verify before you buy

MotoBuildIQ provides general performance suggestions only. Race class rules change every season — always confirm current legality with your organization's rulebook. Horsepower, pricing, and fitment vary by bike, fuel, dyno, and tuner.

  • The legality labels are conservative planning guidance, not official approval. Rule wording differs by organization, motorcycle homologation, model year, and season.
  • Have the engine builder document measurements, part numbers, and machining so eligibility can be demonstrated at technical inspection.