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Internal Engine Chains & Sprockets

Internal engine chains and sprockets are key components that keep the timing system synchronized inside small engines used on ATVs, dirt bikes, scooters, and go-karts. This category includes timing chains, cam sprockets, and related parts often found in GY6 engines and small off-road motors from brands like TaoTao, Roketa, and Jonway. Worn chains or sprockets can lead to poor performance, hard starting, or timing issues. Replacing them helps restore smooth, reliable engine operation.

Internal Engine Chains & Sprockets
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Timing Chain 90 Links Fits Many 125cc Chinese ATVs with 52mm Bore

Timing Chain 90 Links Fits Many 125cc Chinese ATVs with 52mm Bore

$19.99

Part #: 634350

Timing Chain 84 Links Fits Most 90-110cc Chinese ATVs

Timing Chain 84 Links Fits Most 90-110cc Chinese ATVs

$14.99

Part #: 633421

Timing Chain 82 Links Fits Most GY6 49-90cc Scooter & ATVs

Timing Chain 82 Links Fits Most GY6 49-90cc Scooter & ATVs

$14.99

Part #: 633505

Timing Chain 64 Links Fits Tomberlin 110cc Dirtbike

Timing Chain 64 Links Fits Tomberlin 110cc Dirtbike

$14.99

Part #: 153576

Timing Chain 25H 82 Links Fits Most 50/70cc Chinese ATVs

Timing Chain 25H 82 Links Fits Most 50/70cc Chinese ATVs

$14.99

Part #: 633726

Timing Chain 100 Links Fits E-Ton Vector 250cc ATVs

Timing Chain 100 Links Fits E-Ton Vector 250cc ATVs

$12.99

Part #: 811851

CAM TIMING CHAIN 90L GY6-125, GY6-150 Chinese ATVs, GoKarts, Scooters

CAM TIMING CHAIN 90L GY6-125, GY6-150 Chinese ATVs, GoKarts, Scooters

$14.99

Part #: 634844

STARTER CHAIN 62L Most 50-110cc Chinese ATVs Top Starter Models

STARTER CHAIN 62L Most 50-110cc Chinese ATVs Top Starter Models

$14.99

Part #: 633867

Internal Engine Chains & Sprockets for ATVs, UTVs, Dirt Bikes, Go Karts, Scooters, & Mopeds

Internal engine chains and sprockets maintain precise timing between the crankshaft and camshaft, ensuring valves open and close at the correct intervals. Over time, timing chains can stretch and cam sprockets can wear, creating slack that affects performance, idle quality, and overall reliability. Many of the components in this category are designed for GY6 50cc–150cc engines and other small 4-stroke platforms found in scooters, pit bikes, ATVs, and go-karts from brands such as TaoTao, Roketa, Jonway, and similar manufacturers.

This category may include:

  • Timing chains for small 4-stroke engines
  • Camshaft sprockets and crank sprockets
  • Tensioner guide components used inside the timing assembly
  • Parts compatible with GY6 engines and similar powerplants
  • Internal components suitable for TaoTao, Roketa, Jonway, and related brands

Additional notes about this collection:

  • Helps correct timing issues that cause rough idle, hard starting, or loss of power
  • Supports smooth, accurate engine performance at all RPM ranges
  • Recommended during top-end rebuilds or when replacing worn timing components
  • Designed for accurate fitment when matched to engine displacement and chain pitch

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