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OCS 2 Stroke Machine Shop Services

Specializing in 2 stroke performance services, such as nikasil plated cylinder coatings, Ontario Crank Service also offers many other performance services like porting, cylinder sleeving, cylinder repair, cylinder plating, crankshaft and engine rebuilding for all ATV, watercraft, motorcycle, outboards, and snowmobile engines.

2 Stroke Cylinder Repair

We repair cylinders for Motorcycles Dirt Bikes, Street Bikes, ATVs, snowmobiles, personal watercraft, and outboards. When it come to 2 stroke cylinder repair & plating Ontario Crank Service is a name that you can trust.


Nikasil and Chrome Plated Cylinder Repair

Damage to plated cylinders from piston seizure, ring breakage, bearing explosions, detonation, broken bridges, smashed ports and cracked o-ring grooves are repaired by striping, welding, boring, honing and replating.

2 Stroke Cylinder Boring and Sleeving

Cast iron cylinders that are still within limits are repaired by boring & honing the cylinder and fitting it with a oversized piston. Cylinders repair that are out of spec are overbored, fitted with a cast iron sleeve and machined for port match and honed for final fit to the new pistion and ring assembly. Ontario Crank Services also offers custom steel and aluminum  cylinder sleeves for vintage or big bore cylinder applications.


OCS Crankshaft Rebuilding and Truing

Key Benefits

  • 30-ton press used to separate crank halves, and to press
    halves back together
  • Crank trued between lathe centers, using dial test indicators
    for ultra precision
  • Restoration of damaged crankshaft seal surfaces reduces
    premature seal wear and failure

2 Stroke Crankshaft Rebuilding

2 stroke crankshaft rebuilding process includes pressing apart the crank, installing new pin, bearing and connecting rod, and truing to within 0.0005" Truing work done between precision centers, using precision dial test indicators for accuracy. Crankshaft stubs must be clean and undamaged at seal-mating surfaces and bearing-mating surfaces. Tapers must be clean, and keywaysand threads sound.

2 Stroke Crankshaft Truing


The main bearing on a crank often outlasts other engine bearings and bushings, making it possible to keep old cranks in service a long time, and often allowing them to remain un-rebuilt during an engine overhaul. That's fine if the big end bearing shows no play and axial play on the connecting rod is within tolerance.

The trouble comes when the crank is removed and reinstalled, which in vertically split engines generally requires some method of force to pull the crankshafts into their supporting bearings.
Unless this is meticulously performed, it is very easy to throw the crank halves out of alignment, causing the crank shafts to run eccentrically, which stresses the supporting bearings and introduces engine vibration.

Any time a crank is removed, it should be tested for trueness before reinstalling with a special vblock jig and dial indicators.

Outboards Machine Services

Cylinder Boring
Port Chamfering
Hone (Deglaze only)
Cylinder Sleeve
Blind Hole Cylinder Boring

Snowmobile, ATV, PWC & Motorcycle Machine Services

Port Chamfering Per cylinder
Hone (Deglaze only)

Beading Cylinder and crankcase
Cylinder Sleeve
Rotax Rotary Valve Brass Wear Plate
Crank Case Line Boring
Prop and Drive Shaft Straighten
Crankshaft Rebuilding
Clutch Balancing
Clutch Matching
Rave machining when cylinders are bored over .010" from stock