Cylinders & Pistons
To fit a new piston, the cylinder wall must be perfectly round and smooth. That is why you hone the cylinder to size. Choose the right honing device and the matching honing stones. The bore diameter determines the size and number of arms you need. For small bores, use a two-arm hone; for large ones, a three-arm hone. The abrasive type and grit size of the stones set the surface roughness. Also check the maximum RPM and the stone length. This gives you a perfect fit for your new piston.
Honing Tool | flexible | Grain Size 180 | 81 - 83 mm
Honing Tool | flexible | Grain Size 180 | 87 - 89 mm
Honing Tool | flexible | Grain Size 180 | 94 - 96 mm
Honing Tool Set | flexible | 6.3 mm (1/4") Drive | Grain Size 60 / 80 | 8 - 12 - 20 mm | 3 pcs.
Piston Ring Compressor Set | 7 pcs.
Piston Ring Compressor | 60 - 90 mm
3 pack sizes
1-2
Piston Ring Compressor Set
Piston Ring Pliers | 40 - 100 mm
3 pack sizes
1-2
Piston Ring Pliers | 205 mm
Honing Tool Set | 2- and 3-arm | 7 pcs.
Replacement Jaws for Honing Tool BGS 1155 | Jaws 30 mm | K 220 | 2 pcs.
Replacement Jaws for Honing Tool BGS 1156 | Jaws 50 mm | K 220 | 3 pcs.
Replacement Jaws for Honing Tool BGS 1157 | Jaws 100 mm | K 180 | 3 pcs.
Replacement Jaws for Honing Tool BGS 1157 | Jaws 100 mm | K 280 | 3 pcs.
Replacement Jaws for Honing Tool, BGS 74238 | Jaws 75 mm | K 280 | 3 pcs.
Honing cylinders: how to do it right
The right size and number of arms
For a new piston, the cylinder wall must be perfectly round and smooth. That is why you hone the cylinder to size. First measure the diameter of the bore. For small bores, use a hone with two arms. For large bores, choose one with three arms. The jaws must hold the stones securely. Check that the range of the tool matches your cylinder diameter.
Grit and length of the stones
The grit size determines the surface finish. A coarse grit removes more material. A fine grit gives a smooth finish. Choose the grit that suits the condition of your cylinder. The length of the stones also matters. Short stones work in small bores. Long stones give a more even result in large cylinders.
Watch the speed
Do not exceed the maximum speed of the hone. Too high a speed damages the surface. It can also overheat the stones. Work slowly and evenly. This gives a perfect fit for your new piston. Proper preparation prevents wear and premature engine failure.
This honing equipment sits under Engine & Attachments. Combine it with Valves & Valve Springs if you already have the cylinder head off, and with Engine Timing to reset the timing after assembly. For fuel delivery and ignition, see Petrol & Diesel Injectors and Spark Plug Tools.