BRUT-X 300CB engine parts and KTM gasket references
Gaskets, piston, clutch and the differences between carburettor, TPI and TBI generations.
Gaskets are comparison candidates
Useful catalog references include 55430039000, 55430025100, 55430030050, 50430098050 and 50430098060. Compare holes, outline and sealing faces. Cylinder-base thickness affects assembled-engine geometry. Ignition-cover gasket references 55430040000/55430040100 do not establish electrical compatibility beneath the cover.
Internal engine parts need measurements
A nominal bore or capacity does not identify a suitable piston. Check size grade, clearance, pin height, crown, windows and ring-pin positions. Cylinder, head, crankshaft, connecting rod, clutch stack and gearbox need their own dimensional and functional comparisons. The listed KTM codes are references, not confirmed BRUT-X 300CB engine replacements.
Keep fuel-system generations separate
The reference KTM 300 EXC 2017 uses a Mikuni TMX38 carburettor. European EXC TPI arrived for 2018; EXC TBI and electronic exhaust-valve control arrived for 2024. Complete TPI/TBI systems are not direct swaps for a carburetted configuration. Check CDI, stator, rotor, coils and sensors as a matched system. No untested power gains, service clearances or universal tightening torques are claimed.
Parts compatibility table
Download table CSV · 64Parts shown: 32
| Part / assembly | Reference model / Reference | BRUT-X 300CB fitment | Conditions and evidence |
|---|---|---|---|
| P27 · Engine gasketsCrankcase gasket | Reference model / ReferenceKTM 250 EXC Six Days 2017 / 300 EXC 201755430039000 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCompare holes, outline and thickness; a shared gasket does not prove identical crankcases. |
| P28 · Engine gasketsInner clutch-cover gasket | Reference model / ReferenceKTM 250 EXC Six Days 201755430025100 / 55430025000 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCheck revised part numbers, oil passages and the exact cover configuration. |
| P29 · Engine gasketsCylinder-base gasket | Reference model / ReferenceKTM 300 XC 201855430030050 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCorrect thickness and assembled-engine geometry must be checked. |
| P30 · Engine gasketsReed-case gasket | Reference model / ReferenceKTM 250 SX 201950430098050 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCompare holes and outline; this does not confirm the complete reed assembly. |
| P31 · Engine gasketsIntake-flange gasket | Reference model / ReferenceKTM 250 SX 201950430098060 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCompare outline, holes, sealing face and intake configuration. |
| P32 · Engine gasketsIgnition-cover gasket | Reference model / ReferenceKTM 300 EXC 2017–202355430040000 / 55430040100 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCompare cover and holes; gasket fit does not confirm stator or rotor compatibility. |
| P33 · Engine gasketsLeft exhaust-valve cover gasket | Reference model / ReferenceKTM 300 XC 201854837006000 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCheck the exact cover and gasket shape. |
| P34 · Engine gasketsRight exhaust-valve cover gasket | Reference model / ReferenceKTM 300 XC 201854837008000 | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCheck the exact cover and gasket shape. |
| P35 · Engine gasketsOuter cylinder-head O-ring | Reference model / ReferenceKTM 300 XC 20180770105020 · 105 × 2 mm | BRUT-X 300CB fitment△ Candidate: compare the removed part | Conditions and evidenceCheck groove, material and temperature resistance; size alone is insufficient. |
| P36 · Engine gasketsInner cylinder-head O-ring | Reference model / ReferenceKTM 300 XC 20180770078020 · 78 × 2 mm | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceNo target cross-reference confirmed; measure the groove and verify material. |
| P37 · Engine and clutchPiston | Reference model / ReferenceKTM 300 EXC 201755630107000 I / II | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck size grade, clearance, pin height, crown, windows and ring-pin positions. |
| P38 · Engine and clutchPiston rings | Reference model / ReferenceKTM 300 EXC 201754830132000 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck piston grooves, ring profile, locating pins and end gap in the actual cylinder. |
| P39 · Engine and clutchPiston pin and needle bearing | Reference model / ReferenceKTM 300 EXC 201754830233000 / 54430034000 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck dimensions, length, quality and matching piston/connecting rod. |
| P40 · Engine and clutchCylinder and piston assembly | Reference model / ReferenceKTM 300 EXC 201755630038000 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck height, mounts, cooling passages, exhaust valve, exhaust and head. |
| P41 · Engine and clutchCylinder head | Reference model / ReferenceKTM 300 EXC 2017Exact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck spark-plug arrangement, chamber, seals, squish and compression. |
| P42 · Engine and clutchCrankshaft and connecting rod | Reference model / ReferenceKTM 300 EXC 201755430118100 / 54830015244 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck stroke, width, journals, bearings, balance and drive. |
| P43 · Engine and clutchMain bearings and shaft seals | Reference model / ReferenceKTM 300 EXC 2017Exact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck dimensions, clearance, seal material and lubrication passages. |
| P44 · Engine and clutchClutch friction plates | Reference model / ReferenceKTM 300 EXC 201754832011100 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck plate count, thickness, splines, diameter and total stack height. |
| P45 · Engine and clutchClutch basket and hub | Reference model / ReferenceKTM 300 EXC 201779232101073 / 78132002300 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck primary drive, width, shaft, bearing and damping system. |
| P46 · Engine and clutchTransmission shafts, gears and shift forks | Reference model / ReferenceKTM 300 EXC 2017Exact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCompare matched gear pairs, ratios, tooth profiles and axial clearances. |
| P47 · Engine and clutchBalancer shaft | Reference model / ReferenceKTM 300 EXC 201755430057100 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck bearings, gear, timing and crankcase configuration. |
| P48 · Cooling and electricalWater pump | Reference model / ReferenceKTM 300 EXC 201779235055044 / 55435053000 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck shaft/thread, direction, clearance, seals, cover and flow. |
| P49 · Cooling and electricalRadiators and hoses | Reference model / ReferenceKTM 300 EXC 2017Exact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck frame mounts, outlets, thermostat, tank, fan and guards. |
| P50 · Cooling and electricalStarter Bendix | Reference model / ReferenceKTM 300 EXC 201755440126000 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck gears, length, engagement and direction; no target fit test recorded. |
| P51 · Cooling and electricalStator, rotor and CDI | Reference model / ReferenceKTM 300 EXC 2017 / TPI / TBIExact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck connectors, signals, triggering, voltage and coil configuration as a complete system. |
| P52 · Intake and exhaustComplete carburettor | Reference model / ReferenceKTM 300 EXC 2017Mikuni TMX38 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck intake, airbox, cable, orientation, jetting and tuning. |
| P53 · Intake and exhaustCarburettor jets and needles | Reference model / ReferenceKTM 300 EXC 2017Exact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceIdentify the exact carburettor; equal jet numbers across different systems are not proof. |
| P54 · Intake and exhaustComplete reed-valve assembly | Reference model / ReferenceKTM 250 SX 201950430151044 | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceMatching gaskets do not prove equal cage height, reeds or flange. |
| P55 · Intake and exhaustExpansion chamber and silencer | Reference model / ReferenceKTM 300 EXC 2017Exact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck flange, angle, mounts, clearances and engine characteristics. |
| P56 · Intake and exhaustAir filter | Reference model / ReferenceKTM 300 EXC 2017Exact part number not recorded | BRUT-X 300CB fitment? Not confirmed | Conditions and evidenceCheck sealing outline, cage and closure; similar foam is insufficient. |
| P57 · ConfigurationsComplete TPI system on a carburetted bike | Reference model / ReferenceKTM 300 EXC TPI 2018+TPI | BRUT-X 300CB fitment❌ No direct swap for this configuration | Conditions and evidenceA complete TPI system is not a direct replacement for a carburetted configuration; individual parts require separate checks. |
| P58 · ConfigurationsTBI and electronic exhaust-valve system | Reference model / ReferenceKTM 300 EXC TBI 2024+TBI | BRUT-X 300CB fitment❌ No direct swap for this configuration | Conditions and evidenceA complete TBI system and electronic exhaust valve require matching fuel, electrical and control components. |