Off-Road Motorcycle Crankshaft Assembly

Off-road motorcycle crankshaft assembly detail

Off-Road Motorcycle Crankshaft Assembly with Connecting Rod – Dirt Bike Engine Parts

Dhs. 901.91

This off-road motorcycle crankshaft assembly is a complete crankshaft and connecting rod unit for rebuilding the bottom end of an off-road or dirt bike engine. As shown in the product photos, it comes assembled, with full-circle flywheels, the connecting rod already fitted, and machined main shafts on both sides. Easy Life Markets sells it for riders and workshops who need a replacement crank for a worn, noisy or seized engine.

The crankshaft turns the up-and-down movement of the piston into rotation, and in an off-road engine it works at high revs with a lot of shock loading from jumps and rough terrain. Over time, the big-end bearing on the connecting rod wears, the flywheels can shift out of true, and the main bearings suffer. When that happens, replacing the whole crankshaft assembly is usually more reliable than repairing the old one.

What Is Included

The supplier's packing list describes the item as one engine part. As pictured, the listing shows:

1 x crankshaft assembly with connecting rod

The photos also show a ball bearing and two small keys next to the crankshaft. Because the packing list does not mention them, please contact us if you need to confirm whether they are supplied before you order.

Specifications

Product type: Motorcycle crankshaft and connecting rod assembly
Listed application: Off-road motorcycle engines
Type: Engine component
Quantity: 1 assembly
SKU: CJYD293606102BY

Checking Fitment

The supplier does not list a brand, model, engine size or part number for this crankshaft. Off-road motorcycle crankshafts vary widely in stroke, shaft length, taper, thread size and connecting rod length, even between engines of the same size. It is essential to compare this part with your own before ordering:

Measure your old crankshaft: overall length, flywheel diameter and width, and the length of each main shaft.
Check the ends: taper, keyway position and thread size on the ignition side, and splines or threads on the primary drive side.
Check the connecting rod: center-to-center length and small-end diameter (to match your piston pin).
Compare the photos with your part from several angles.

Send your measurements, engine model and photos to us through our contact page and we will help you compare before you buy.

Signs the Crankshaft Needs Replacing

Knocking or rattling from the bottom end, especially under load
Up-and-down play in the connecting rod big end
Excessive vibration through the footpegs and bars
Damage after an engine seizure or a broken piston
Worn tapers, keyways or threads on the crankshaft ends

Rebuild Tips

Replacing the crankshaft means splitting the crankcases, so plan a full bottom-end rebuild.
Fit new main bearings and crankshaft seals. On two-stroke engines, the seals are critical for crankcase pressure.
Check the crankshaft runout on V-blocks with a dial gauge before fitting, and follow the specification in your service manual.
Use the correct crankcase splitting and crankshaft installation tools to avoid knocking the crankshaft out of true.
Inspect the piston, cylinder, gearbox bearings and clutch while the engine is apart.

Why Replace the Complete Assembly

Rebuilding an old crankshaft means pressing it apart, fitting a new rod and bearing, and truing the flywheels, which needs special tools and experience. A complete assembly arrives ready to fit, which saves time and reduces the chance of errors. It is often the practical choice for riders who want their bike back on the trail quickly.

Looking After the New Crankshaft

For two-stroke engines, always use the correct fuel and oil mix, fresh fuel and a clean air filter, since a lean mixture or dirt entering the engine quickly damages bearings. For four-stroke engines, change the oil regularly and keep the level correct. Follow a gentle break-in period after the rebuild before riding hard.

Who This Part Is For

This crankshaft assembly suits motorcycle workshops, experienced riders who rebuild their own engines, and anyone who has matched it carefully with the original crankshaft from their off-road bike.

Common Questions

Which bikes does it fit? The supplier does not give specific models, so fit must be confirmed by comparing measurements and photos with your old crankshaft.

Is it for a two-stroke or four-stroke engine? The listing does not say. Please compare the design with your original part or ask us before ordering.

Buy the Off-Road Motorcycle Crankshaft Assembly at Easy Life Markets

You can order this crankshaft assembly right here. The current price and availability are shown on this page. Please read our return and refund policy before buying.