{"id":3582,"date":"2026-04-03T03:46:54","date_gmt":"2026-04-03T03:46:54","guid":{"rendered":"https:\/\/motorcyclechain.top\/?post_type=product&p=3582"},"modified":"2026-04-03T03:46:58","modified_gmt":"2026-04-03T03:46:58","slug":"motorcycle-timing-chain-25-25h-25sh-06b-series","status":"publish","type":"product","link":"https:\/\/motorcyclechain.top\/sr\/product\/motorcycle-timing-chain-25-25h-25sh-06b-series\/","title":{"rendered":"\u041b\u0430\u043d\u0430\u0446 \u0437\u0443\u043f\u0447\u0430\u0441\u0442\u043e\u0433 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0437\u0430 \u043c\u043e\u0442\u043e\u0446\u0438\u043a\u043b *25 *25H *25SH \u0441\u0435\u0440\u0438\u0458\u0430 06B"},"content":{"rendered":"
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<\/p>\n

How the Timing Chain Works in a Motorcycle Engine<\/h2>\n
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\u0410 motorcycle timing chain<\/strong> is the mechanical link between the crankshaft and the camshaft inside a four-stroke engine. Its job is precise: the crankshaft rotates twice for every one full combustion cycle, and the camshaft must rotate at exactly half that speed so the intake and exhaust valves open and close at the right moment relative to piston position. If these timings drift \u2014 even slightly \u2014 fuel economy drops, power falls, and in severe cases valve-to-piston contact occurs at high rpm.<\/p>\n

\"\u041b\u0430\u043d\u0430\u0446<\/p>\n

Unlike the rear drive chain on the outside of the engine, the timing chain operates inside a sealed oil-wet environment. It is lubricated continuously by the engine’s own oil system, requires no external maintenance from the owner, and is managed by an automatic hydraulic or spring tensioner that compensates for chain wear over time. When a timing chain does reach the end of its service life, the symptoms are measurable and audible: a rattling noise on cold startup from the timing cover, slight valve timing retardation that shows up as mild power loss, and in advanced wear, an intermittent misfire as the chain skips a tooth under load.<\/p>\n

Korea Ever-Power Motorcycle Chain Co., Ltd. supplies timing chains across three pitch sizes \u2014 6.350 mm, 7.774 mm, and 9.525 mm \u2014 covering the *25, *25H, *25SH, 05H-1, *219HT, *BF05T, 06BH, 06BT, 06B, *35, and *C35 series. These are the pitch families most commonly found in small to medium displacement four-stroke \u043b\u0430\u043d\u0446\u0438 \u0437\u0430 \u043c\u043e\u0442\u043e\u0446\u0438\u043a\u043b\u0435<\/a> and engine applications.<\/p>\n<\/div>\n

<\/p>\n

Timing Chain Size Chart<\/h2>\n
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The table covers all timing chain series in our range. Transverse pitch (Pt) applies only to the double-strand variants (06BT-2, *35-2, *C35*2, 06B-2); single-strand chains leave this cell blank. Ultimate tensile strength (Q min) is the minimum guaranteed break load; average tensile strength (Q0) reflects the mean across tested samples from each production batch.<\/p>\n<\/div>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u0411\u0440\u043e\u0458 \u043b\u0430\u043d\u0446\u0430<\/td>\n\u0422\u043e\u043d<\/td>\nTransverse Pitch<\/td>\nWidth Between Inner Plates<\/td>\nRoller Dia.<\/td>\nPin Dia.<\/td>\nPin Length<\/td>\nInner Plate Height<\/td>\nUltimate Tensile Strength<\/td>\nAverage Tensile Strength<\/td>\n\u0422\u0435\u0436\u0438\u043d\u0430<\/td>\n<\/tr>\n
p<\/td>\nPt Mon<\/td>\nb1 min<\/td>\nd1 max<\/td>\n\u04342 \u043c\u0430\u043a\u0441<\/td>\nL max<\/td>\nh2 max<\/td>\nQ min<\/td>\n\u041a0<\/td>\nq<\/td>\n<\/tr>\n
\u043c\u043c<\/td>\n\u043c\u043c<\/td>\n\u043c\u043c<\/td>\n\u043c\u043c<\/td>\n\u043c\u043c<\/td>\n\u043c\u043c<\/td>\n\u043c\u043c<\/td>\n\u043a\u041d<\/td>\n\u043a\u041d<\/td>\n\u043a\u0433\/\u043c\u00b2<\/td>\n<\/tr>\n<\/thead>\n
*25<\/td>\n6.350<\/td>\n\u2014<\/td>\n3.10<\/td>\n3.30<\/td>\n2.31<\/td>\n7.80<\/td>\n5.90<\/td>\n3.50<\/td>\n4.20<\/td>\n0.14<\/td>\n<\/tr>\n
*25H<\/td>\n6.350<\/td>\n\u2014<\/td>\n3.10<\/td>\n3.30<\/td>\n2.31<\/td>\n9.00<\/td>\n5.90<\/td>\n4.80<\/td>\n5.20<\/td>\n0.18<\/td>\n<\/tr>\n
*25SH<\/td>\n6.350<\/td>\n\u2014<\/td>\n3.10<\/td>\n3.30<\/td>\n2.01<\/td>\n9.00<\/td>\n5.90<\/td>\n5.20<\/td>\n5.50<\/td>\n0.17<\/td>\n<\/tr>\n
5.00E-01<\/td>\n8.000<\/td>\n\u2014<\/td>\n4.60<\/td>\n5.65<\/td>\n3.05<\/td>\n12.35<\/td>\n7.60<\/td>\n7.80<\/td>\n8.20<\/td>\n0.38<\/td>\n<\/tr>\n
O5H-1<\/td>\n8.000<\/td>\n\u2014<\/td>\n4.60<\/td>\n5.65<\/td>\n3.05<\/td>\n11.40<\/td>\n7.60<\/td>\n7.80<\/td>\n8.20<\/td>\n0.38<\/td>\n<\/tr>\n
*219HT<\/td>\n7.774<\/td>\n\u2014<\/td>\n4.90<\/td>\n4.59<\/td>\n3.00<\/td>\n11.50<\/td>\n7.50<\/td>\n7.80<\/td>\n9.50<\/td>\n0.32<\/td>\n<\/tr>\n
*BF05T<\/td>\n8.000<\/td>\n\u2014<\/td>\n4.80<\/td>\n4.77<\/td>\n3.28<\/td>\n11.60<\/td>\n7.60<\/td>\n7.00<\/td>\n9.20<\/td>\n0.35<\/td>\n<\/tr>\n
06BH<\/td>\n9.525<\/td>\n\u2014<\/td>\n3.84<\/td>\n6.35<\/td>\n3.28<\/td>\n10.60<\/td>\n8.20<\/td>\n9.00<\/td>\n9.50<\/td>\n0.35<\/td>\n<\/tr>\n
06BT-l<\/td>\n9.525<\/td>\n\u2014<\/td>\n5.72<\/td>\n6.35<\/td>\n3.28<\/td>\n12.50<\/td>\n8.20<\/td>\n9.00<\/td>\n9.50<\/td>\n0.39<\/td>\n<\/tr>\n
06BT-2<\/td>\n9.525<\/td>\n10.24<\/td>\n5.72<\/td>\n6.35<\/td>\n3.28<\/td>\n22.90<\/td>\n8.20<\/td>\n16.90<\/td>\n17.90<\/td>\n0.80<\/td>\n<\/tr>\n
*C35*2<\/td>\n9.525<\/td>\n10.13<\/td>\n5.72<\/td>\n5.08<\/td>\n3.58<\/td>\n22.20<\/td>\n8.70<\/td>\n15.80<\/td>\n19.00<\/td>\n1.21<\/td>\n<\/tr>\n
*35-1<\/td>\n9.525<\/td>\n\u2014<\/td>\n5.72<\/td>\n5.08<\/td>\n3.58<\/td>\n12.15<\/td>\n8.95<\/td>\n7.90<\/td>\n9.80<\/td>\n0.33<\/td>\n<\/tr>\n
*35-2<\/td>\n9.525<\/td>\n10.13<\/td>\n5.72<\/td>\n5.08<\/td>\n3.58<\/td>\n22.20<\/td>\n8.95<\/td>\n15.80<\/td>\n19.00<\/td>\n0.63<\/td>\n<\/tr>\n
06B-1<\/td>\n9.525<\/td>\n\u2014<\/td>\n5.72<\/td>\n6.35<\/td>\n3.28<\/td>\n13.20<\/td>\n8.20<\/td>\n8.90<\/td>\n10.00<\/td>\n0.41<\/td>\n<\/tr>\n
06B-2<\/td>\n9.525<\/td>\n10.24<\/td>\n5.72<\/td>\n6.35<\/td>\n3.28<\/td>\n23.50<\/td>\n8.20<\/td>\n16.90<\/td>\n17.90<\/td>\n0.77<\/td>\n<\/tr>\n
06BH<\/td>\n9.525<\/td>\n\u2014<\/td>\n5.72<\/td>\n6.35<\/td>\n3.28<\/td>\n13.90<\/td>\n8.20<\/td>\n9.00<\/td>\n10.00<\/td>\n0.45<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Roller Timing Chain vs Silent Chain \u2014 Which Does Your Engine Use?<\/h2>\n
\n

The terms “timing chain” and “cam chain” both refer to the engine’s valve timing drive, but the chain type varies by engine design. Roller timing chains (the *25, 06B, *35 series above) and silent chains (the CL04 series covered separately) serve the same function through different mechanical approaches. Knowing which type your engine uses matters when sourcing a replacement \u2014 the sprocket tooth profiles differ between the two types and are not interchangeable.<\/p>\n

\"Timing<\/p>\n<\/div>\n

\n\n\n\n\n\n\n\n\n\n\n\n
\u041a\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0430<\/th>\nRoller Timing Chain (*25, 06B, *35 series)<\/th>\nSilent Chain (CL04 series)<\/th>\n<\/tr>\n<\/thead>\n
Drive mechanism<\/td>\nRollers seat in sprocket tooth valleys<\/td>\nInverted-tooth plates mesh with flat sprocket faces<\/td>\n<\/tr>\n
Noise at engagement<\/td>\nHigher \u2014 roller impact at each tooth<\/td>\nLower \u2014 smooth sliding mesh contact<\/td>\n<\/tr>\n
Common in<\/td>\nOlder SOHC\/DOHC engines, budget models<\/td>\nModern DOHC engines, performance applications<\/td>\n<\/tr>\n
Sprocket tooth profile<\/td>\nCurved valley for roller seating<\/td>\nFlat face for plate meshing \u2014 not interchangeable<\/td>\n<\/tr>\n
\u041f\u043e\u0434\u043c\u0430\u0437\u0438\u0432\u0430\u045a\u0435<\/td>\nEngine oil system \u2014 no external maintenance<\/td>\nEngine oil system \u2014 no external maintenance<\/td>\n<\/tr>\n
Identification in engine<\/td>\nRound rollers visible between link plates<\/td>\nFlat tooth-profile link plates, no rollers<\/td>\n<\/tr>\n
Replacement compatibility<\/td>\nMust use roller type with matching roller sprocket<\/td>\nMust use silent type with matching silent sprocket<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n

To confirm which type your engine uses, look through the oil filler cap opening with the engine warm or remove the timing cover with proper tools \u2014 roller chains are immediately distinguishable by their round rollers between the plates. The service manual for your motorcycle will specify the chain series number, pitch, and link count required for replacement.<\/p>\n<\/div>\n

The Timing Chain Cycle \u2014 Step by Step<\/h2>\n
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Understanding how the timing chain translates crankshaft rotation into precise valve movement helps clarify why chain condition affects every aspect of engine performance:<\/p>\n<\/div>\n

    \n
  1. 1<\/span>
    \nThe crankshaft rotates continuously while the engine runs, driven by combustion pressure acting on the pistons.<\/li>\n
  2. 2<\/span>
    \nA sprocket fixed to the crankshaft drives the timing chain. The chain transmits this rotation upward through the engine block to the camshaft sprocket \u2014 which has twice the tooth count of the crankshaft sprocket, so the camshaft turns at half crankshaft speed.<\/li>\n
  3. 3<\/span>
    \nThe camshaft’s lobes push against the valve train components (rocker arms, tappets, or followers) in a precisely profiled sequence, opening intake and exhaust valves at controlled durations and lifts.<\/li>\n
  4. 4<\/span>
    \nValve timing determines when air-fuel mixture enters the cylinder (intake valve) and when exhaust gases exit (exhaust valve). These events must be coordinated with piston position to maximise combustion efficiency.<\/li>\n
  5. 5<\/span>
    \nAs the chain wears and elongates, the camshaft timing retards slightly relative to the crankshaft. The engine management system (on fuel-injected engines) or the mechanic’s timing check (on carburetted engines) detects this drift. Regular oil changes slow chain wear; neglecting oil intervals accelerates it significantly.<\/li>\n<\/ol>\n

    <\/p>\n

    Signs a Timing Chain Needs Replacing<\/h2>\n
    \n

    Motorcycle timing chains<\/strong> are designed to last the engine’s full service life \u2014 typically 100,000\u2013160,000 km \u2014 but poor oil maintenance or high-output engine modifications can shorten this considerably. Watch for these specific indicators:<\/p>\n

    \"Motorcycle<\/p>\n<\/div>\n