https://www.jensenraceteam.co.uk Performance parts engineered from decades of historic racing experience 26 TTO BTOS18328TC Crankshaft Oil Seal – 18 × 32 × 8 mm, Teflon Lip – TKM BT82 Direct Drive TTO BTOS18328TC is a Teflon-lipped crankshaft oil seal measuring 18 × 32 × 8 mm, designed as the approved replacement for the discontinued ROLF crankshaft oil seal in TKM BT82 kart engines. The Teflon lip coating reduces friction and wear compared to standard rubber-lip designs, delivering improved sealing performance and extended service life at crankshaft operating speeds. Homologated for TKM BT82 competition use from January 2026, this seal fits the old-type direct drive small bearing crankcase — the earlier BT82 configuration. Note: this is not the large bearing variant; verify your crankcase type before ordering. It is the current factory-approved replacement following discontinuation of the original ROLF seal. New manufacturer-fresh stock. Sold as a single seal. https://www.jensenraceteam.co.uk/shop/tto-btos18328tc-crankshaft-oil-seal-18-32-8-mm-teflon-lip-tkm-bt82-direct-drive https://media.jensenraceteam.co.uk/tto-crankshaft-oil-seal-tkm-bt82-direct-drive-18x32x8mm-front.jpg https://media.jensenraceteam.co.uk/tto-crankshaft-oil-seal-tkm-bt82-direct-drive-18x32x8mm-back.jpg 7.50 GBP in_stock 50 new TTO 5613 Kart Parts > Engine BTOS18328TC Teflon lip seal: reduced friction versus standard rubber-lip seals for longer crankshaft service life Direct replacement for discontinued ROLF oil seal: same 18 × 32 × 8 mm fitment, no modification required TKM-homologated: legal for TKM BT82 competition use from January 2026 Old-type direct drive small bearing crankcase fitment: not interchangeable with later large bearing variants DimensionsBore (ID)18mm DimensionsOuter Diameter32mm DimensionsWidth8mm 0 1 default 0.8 3.2 3.2 4 0.025 25 FAG 6205-C-TVH-C4 Deep Groove Ball Bearing – 25 x 52 x 15 mm, Open, C4 Clearance – Kart Crankshaft Bearing, TKM BT82 & TM KZ10 FAG 6205-C-TVH-C4 is a single-row, open deep-groove ball bearing from Schaeffler's Generation C range, used as the crankshaft main bearing in 2-stroke kart engines with a 25 mm journal. Confirmed fitments include the Formula TKM BT82 (25mm crankshaft side), TM Racing KZ10, and BMB EasyKart 125cc. Important: the most common 125cc TAG engines — IAME X30, Rotax Max, and Vortex ROK GP — use a 6206 C4 bearing (30mm journal), not this one. C4 clearance is designed for high-speed, high-temperature running where a tighter bearing would bind — essential in engines running to 15,000 rpm. Lightweight TVH polyamide cage (glass-fibre-reinforced PA66). Open construction lets the 2-stroke fuel-oil mix circulate freely. Fits a 25 mm shaft, 52 mm housing, 15 mm width. Basic dynamic load rating 15,900 N; limiting speed 21,600 rpm. New, manufacturer-fresh FAG stock. https://www.jensenraceteam.co.uk/shop/fag-6205-c-tvh-c4-deep-groove-ball-bearing-25-x-52-x-15-mm-open-c4-clearance-kart-crankshaft-bearing-tkm-bt82-tm-kz10 https://media.jensenraceteam.co.uk/fag-6205-c-tvh-c4-deep-groove-ball-bearing-open-front.jpg https://media.jensenraceteam.co.uk/fag-6205-c-tvh-c4-deep-groove-ball-bearing-open-back.jpg 7.45 GBP in_stock 50 new FAG 5613 Kart Parts > Engine 4054372640209 6205-C-TVH-C4 C4 extra-loose radial clearance — accommodates thermal expansion, rings dimensionally stable to 120°C TVH glass-fibre reinforced polyamide (PA66) cage — lightweight and dimensionally stable at high RPM Open design — correct for oil-bath and forced-lubrication assemblies FAG Generation C — improved bearing kinematics for lower friction and reduced operating noise 21,600 rpm limiting speed — rated for demanding high-RPM applications Standard 25 × 52 × 15 mm — OEM-spec fit for TKM BT82 (25mm side) and TM Racing KZ10 crankshaft P6 tolerance class — tighter than standard P0 for improved running accuracy DimensionsBore Diameter25mm DimensionsOuter Diameter52mm DimensionsWidth15mm DimensionsWeight112g 0 1 default 0.130 24 FAG 6204-C-TVH-C4 Deep Groove Ball Bearing – 20 x 47 x 14 mm, Open, C4 Clearance – Kart Crankshaft Bearing, TKM BT82 & 125cc FAG 6204-C-TVH-C4 is a single-row, open deep-groove ball bearing from Schaeffler's Generation C range, widely used as the crankshaft main bearing in 2-stroke kart engines. Standard fitments include the Formula TKM BT82 and various 125cc TAG and shifter engines — Rotax Max, IAME, and Vortex among them — where the 20 mm crankshaft journal is specified. C4 clearance is designed for high-speed, high-temperature running where a tighter bearing would bind — essential in engines running 11,000–15,000 rpm. Lightweight TVH polyamide cage (glass-fibre-reinforced PA66). Open construction lets the 2-stroke fuel-oil mix circulate freely. Fits a 20 mm shaft, 47 mm housing, 14 mm width. Basic dynamic load rating 14,700 N; limiting speed 24,300 rpm. New, manufacturer-fresh FAG stock. https://www.jensenraceteam.co.uk/shop/fag-6204-c-tvh-c4-deep-groove-ball-bearing-20-x-47-x-14-mm-open-c4-clearance-kart-crankshaft-bearing-tkm-bt82-125cc https://media.jensenraceteam.co.uk/fag-6204-c-tvh-c4-deep-groove-ball-bearing-open-front.jpg https://media.jensenraceteam.co.uk/fag-6204-c-tvh-c4-deep-groove-ball-bearing-open-back.jpg 6.50 GBP in_stock 20 new FAG 5613 Kart Parts > Engine 4054372546662 6204-C-TVH-C4 C4 extra-loose radial clearance — accommodates thermal expansion, rings dimensionally stable to 120°C TVH glass-fibre reinforced polyamide (PA66) cage — lightweight and dimensionally stable at high RPM Open design — correct for oil-bath and forced-lubrication assemblies FAG Generation C — improved bearing kinematics for lower friction and reduced operating noise 24,300 rpm limiting speed — rated for demanding high-RPM applications Standard 20 × 47 × 14 mm — OEM-spec fit for TKM BT82 crankshaft and compatible 125cc kart engines P6 tolerance class — tighter than standard P0 for improved running accuracy DimensionsBore Diameter20mm DimensionsOuter Diameter47mm DimensionsWidth14mm DimensionsWeight96g 0 1 default 4.7 4.7 1.4 96 0.096 23 Medway B8/40MM-3GS-2Z Kart Axle Bearing – 40 × 80 mm, 2Z Shields, C3 Clearance, 3 Grub Screws – 40mm Axle, 80mm Carrier The Medway B8/40MM-3GS-2Z is a precision 40 × 80 mm sealed ball bearing built for kart rear axles. Three integral grub screws clamp the bearing to the axle while the double metal shields keep track dust and debris out of the race. It uses a 40mm bore, 80mm outer diameter, 2Z double metal shielding, C3 internal clearance, and a polymer cage. The inner race is extended on one side and carries three drilled-and-tapped grub screws — that's the collar that clamps directly to the axle. C3 clearance gives extra room for thermal expansion under sustained load so the bearing runs cooler than a standard-clearance equivalent, and the 2Z shields seal out grit without the drag of a contact seal. This bearing fits any kart chassis running a 40mm rear axle with an 80mm bearing carrier or cassette. Not every 40mm-axle kart uses an 80mm outer diameter — some setups use 72mm or 90mm carriers — so measure your existing carrier or take the old bearing to a digital caliper before ordering. New, manufacturer-fresh stock from Medway Power Transmission Ltd, a UK manufacturer (the bearing brand formerly trading as Dunlop BTL). https://www.jensenraceteam.co.uk/shop/medway-b8-40mm-3gs-2z-kart-axle-bearing-40-80-mm-2z-shields-c3-clearance-3-grub-screws-40mm-axle-80mm-carrier https://media.jensenraceteam.co.uk/Medway%20B10%2040MM%203GS%202Z%2088493%2040mm%20Kart%20Axle%20Bearing%2080mm%20OD%20Back.jpg 15.00 GBP in_stock 50 new Medway 5613 Kart Parts > Steering & Axle Components 5059161368028 B8/40MM-3GS-2Z Bore × OD: 40 × 80 mm — matches 40mm rear axles running 80mm carriers Shielding: 2Z double metal shields — keeps track dust and grit out without contact-seal drag Clearance: C3 internal clearance — extra room for thermal expansion, runs cooler under sustained load Locking: 3 integral grub screws — clamps the inner race directly to the axle, no slip under braking or acceleration Cage: Polymer cage — lighter than steel and quieter at speed Sourcing: Made in the UK by Medway Power Transmission Ltd (formerly Dunlop BTL) DimensionsBore Diameter40mm DimensionsOuter Diameter80mm PerformanceClearance ClassC3 BuildShield Type2Z (Double Metal Shields) BuildCage MaterialPolymer BuildGrub Screws3 0 1 default 0.120 20 Medway B10/50MM-3GS-2Z Kart Axle Bearing – 50 × 90 mm, 2Z Shields, C3 Clearance, 3 Grub Screws – 50mm Axle, 90mm Carrier The Medway B10/50MM-3GS-2Z is a precision 50 × 90 mm sealed ball bearing built for kart rear axles. Three integral grub screws clamp the bearing to the axle while the double metal shields keep track dust and debris out of the race. It uses a 50mm bore, 90mm outer diameter, 2Z double metal shielding, C3 internal clearance, and a polymer cage. The inner race is extended on one side and carries three drilled-and-tapped grub screws — that's the collar that clamps directly to the axle. C3 clearance gives extra room for thermal expansion under sustained load so the bearing runs cooler than a standard-clearance equivalent, and the 2Z shields seal out grit without the drag of a contact seal. This bearing fits any kart chassis running a 50mm rear axle with a 90mm bearing carrier or cassette. Not every 50mm-axle kart uses a 90mm outer diameter — some setups use 80mm carriers (the B8/50MM-3GS-2Z variant) — so measure your existing carrier or take the old bearing to a digital caliper before ordering. New, manufacturer-fresh stock from Medway Power Transmission Ltd, a UK manufacturer (the bearing brand formerly trading as Dunlop BTL). https://www.jensenraceteam.co.uk/shop/medway-b10-50mm-3gs-2z-kart-axle-bearing-50-90-mm-2z-shields-c3-clearance-3-grub-screws-50mm-axle-90mm-carrier https://media.jensenraceteam.co.uk/medway-b10-50mm-3gs-2z-88493-kart-axle-bearing-front.jpg https://media.jensenraceteam.co.uk/medway-b10-50mm-3gs-2z-88493-kart-axle-bearing-back.jpg https://media.jensenraceteam.co.uk/medway-b10-50mm-3gs-2z-88493-kart-axle-bearing-dimensions-diagram.jpg 22.50 GBP in_stock 50 new Medway 5613 Kart Parts > Steering & Axle Components 5059161369063 B10/50MM-3GS-2Z Bore × OD: 50 × 90 mm — matches 50mm rear axles running 90mm carriers Shielding: 2Z double metal shields — keeps track dust and grit out without contact-seal drag Clearance: C3 internal clearance — extra room for thermal expansion, runs cooler under sustained load Locking: 3 integral grub screws — clamps the inner race directly to the axle, no slip under braking or acceleration Cage: Polymer cage — lighter than steel and quieter at speed Sourcing: Made in the UK by Medway Power Transmission Ltd (formerly Dunlop BTL) DimensionsBore Diameter50mm DimensionsBore Diameter90mm PerformanceClearance ClassC3 BuildShield Type2Z (Double Metal Shields) BuildCage MaterialPolymer BuildGrub Screws3 0 1 default 0.593 19 JFK SB208/50 ZZ C5 Kart Rear Axle Bearing – 50x80mm, C5 Clearance, Chamfered Edge – Fits OTK, Tony Kart & All 50mm Kart Axles The JFK SB208/50 ZZ C5 is the rear axle bearing fitted as standard to most modern 50mm-axle racing karts. The C5 extra-wide internal clearance lets the bearing expand under sustained race-pace heat without binding, while the chamfered outer edge slides cleanly into magnesium and aluminium bearing cassettes without scoring. Double metal shields (ZZ) keep grit out of the raceway, and three M8 × 1.00 grub screws on the inner collar lock the bearing onto the axle so it stays put through repeated heat cycles and kerb hits. The 18mm outer race seats in a standard 50x80mm bearing cassette, with the 36mm inner collar overhang giving the set screws plenty of length to bite on. Fits OTK chassis (Tony Kart, Kosmic, Redspeed, Exprit), CRG, Praga, Gillard and every other 50mm axle chassis on the grid — across Rotax Max, IAME X30, IAME Leopard, Vortex Rok and KZ classes. https://www.jensenraceteam.co.uk/shop/jfk-sb208-50-zz-c5-kart-rear-axle-bearing-50x80mm-c5-clearance-chamfered-edge-fits-otk-tony-kart-all-50mm-kart-axles https://media.jensenraceteam.co.uk/jfk-sb208-50-zz-c5-50mm-kart-axle-bearing-front.jpg https://media.jensenraceteam.co.uk/jfk-sb208-50-zz-c5-50mm-kart-axle-bearing-back.jpg https://media.jensenraceteam.co.uk/jfk-sb208-50-zz-c5-50mm-kart-axle-bearing-dimensions-diagram.jpg 20.00 GBP in_stock 47 new JFK 5613 Kart Parts > Steering & Axle Components SB208/50 ZZ C5 C5 extra-wide clearance — bearing stays free under sustained race-pace heat where C3 would start to bind Chamfered outer edge — slides cleanly into magnesium and aluminium bearing cassettes without scoring Three M8 × 1.00 grub screws on inner collar — locks bearing to axle through heat cycles and kerb hits Double metal shields (ZZ) — keeps dust, grit and rubber dust out of the raceway 18mm outer race width — drop-in fit for standard 50x80mm bearing cassettes on OTK, CRG, Praga, Gillard chassis 36mm total width — inner collar overhang gives the set screws full thread engagement on the axle DimensionsBore Diameter50mm DimensionsOuter Diameter80mm DimensionsOuter Race Width18mm DimensionsTotal Width (with inner collar)36mm PerformanceClearance ClassC5 (extra wide) BuildShield TypeZZ (double metal shield) BuildBearing TypeRadial insert ball bearing (UC/SB series) BuildLocking System3 × M8 × 1.00 grub screws on inner collar BuildEdge ProfileChamfered outer edge BuildManufacturerJFK 0 1 default 0.080 18 JFK SB206 ZZ C5 Kart Rear Axle Bearing – 30x62mm, C5 Clearance – Fits OTK, Tony Kart & All 30mm Cadet Kart Axles The JFK SB206 ZZ C5 is the rear axle bearing factory-fitted to OTK cadet and junior chassis. The C5 extra-wide internal clearance lets it expand under sustained heat without binding — important for cadet classes where short race distances and high engine RPM stack heat into the rear end quickly. Double metal shields (ZZ) keep grit out of the raceway, and two M8 × 1.00 grub screws on the inner collar lock the bearing onto the axle so it stays put through repeated heat cycles and kerb hits. The 16mm outer race seats in a standard 30x62mm bearing cassette, with a 14mm inner collar overhang that positions the grub screws clear of the bearing race. Fits all OTK cadet chassis (Tony Kart, Kosmic, Redspeed, Exprit), Birel ART, Gillard, LN Racing Kart and every other 30mm cadet/junior chassis — across Rotax Micro Max, Rotax Mini Max, IAME X30 Water Swift, IAME Gazelle and Honda Cadet classes. https://www.jensenraceteam.co.uk/shop/jfk-sb206-zz-c5-kart-rear-axle-bearing-30x62mm-c5-clearance-fits-otk-tony-kart-all-30mm-cadet-kart-axles https://media.jensenraceteam.co.uk/jfk-sb206-zz-c5-30mm-kart-axle-bearing-front.jpg https://media.jensenraceteam.co.uk/jfk-sb206-zz-c5-30mm-kart-axle-bearing-back.jpg https://media.jensenraceteam.co.uk/jfk-sb206-zz-c5-30mm-kart-axle-bearing-dimensions-diagram.jpg 23.00 GBP in_stock 20 new JFK 5613 Kart Parts > Steering & Axle Components SB206 ZZ C5 C5 extra-wide clearance — bearing stays free under sustained cadet-class heat where C3 would start to bind Two M8 × 1.00 grub screws on inner collar — locks bearing to axle through heat cycles and kerb hits Double metal shields (ZZ) — keeps dust, grit and rubber dust out of the raceway 16mm outer race width — drop-in fit for standard 30x62mm bearing cassettes on OTK cadet, Birel ART, Gillard chassis 14mm inner collar overhang — positions the grub screws clear of the bearing race for solid axle clamping Factory-fitted OEM spec — the same JFK bearing supplied as the genuine OTK / Tony Kart cadet spare DimensionsBore Diameter30mm DimensionsOuter Diameter62mm DimensionsOuter Race Width16mm DimensionsTotal Width (with inner collar)30mm PerformanceClearance ClassC5 (extra wide) BuildShield TypeZZ (double metal shield) BuildBearing TypeRadial insert ball bearing (UC/SB series) BuildLocking System2 × M8 × 1.00 grub screws on inner collar BuildManufacturerJFK 0 1 default 0.050