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BMW Motorcycle Piston With Rings And Wristpins

Engine Pistons, Rings, and Wristpins: a Buying Guide

What They are and What They Do

Pistons

These are critical parts of the combustion process in your BMW motorcycle's engine. They may seem to have a simple job -- sliding back and forth in the cylinder head bore in the block, keeping that process going -- but there's a lot more to them, not to mention plenty of parts that make them up.

For one, as they need to be both lightweight and great at conducting heat to work properly, most pistons are made of a cast aluminum alloy. Secondly, their constituent parts and features range from a head, pin bore, and pin to a skirt and rings, ring grooves, and ring lands. The pin bore is a hole in the side of the piston that receives the pin, a hollow shaft that integrates an engine's connecting rod and the piston.

The skirt, on the other hand, is closest to the crankshaft and helps align the piston as it passes through the bore. Skirts are sometimes profiled to keep the piston as small as possible and give the crankshaft counterweights the clearance they need to run right.

Rings

Piston rings create a seal between the piston and cylinder wall to close off the combustion chamber, conduct heat, and return oil to the engine's crankcase; they're commonly made from cast iron, and their configuration and how big they are vary depending on how the engine's designed and what the cylinder's made of. The ring groove, however, is a recessed area on the perimeter of the piston that helps retain the piston ring. Ring lands, on the other hand, are the parallel surfaces of the groove which help in sealing the ring.

The rings you see most often on small engines include a compression ring, a wiper ring, and an oil ring. The compression ring, you can find in the groove closest to the piston head; it helps keep the combustion chamber from leaking while the engine burns fuel. The wiper ring is the one with the tapered face in the groove between the compression ring and the oil ring; it's also a seal, but it also helps keep excess oil off the cylinder wall. It even helps capture combustion gases that get past the compression ring. Finally, the oil ring, found in the groove closest to the crankcase, does the same thing as the wiper ring, but also helps send excess oil back to the oil reservoir in the block.

Wristpins

These, also called piston pins or gudgeon pins, connect the heads of pistons to connecting rods. More specifically, they give rods bearings to pivot on during piston movement. You usually find them made of hardened steel, but these days, if your bike's high-performance, they can also be made of tool steel, as it's the most durable and designed to stand up to high horsepower. They're also designed hollow to keep weight to a minimum, with high-performance variants correspondingly even lighter-weight to enable an engine to accelerate a lot quicker.

On stock engines, piston pins get their lubrication and cooling from oil sprayed off the crankshaft as it turns in the block. In systems designed for racing or other high-performance applications, however, there's often a system of tubes directed at the pistons' bottoms which spray the oil directly onto the pins and pin bosses; this helps the pistons produce max horsepower while staving off engine failure caused by heat.

A pin can be held in place one of several ways. Most stock designs are pressed-fit, with the pin being pressed into the rod. On high-performance pistons, however, they're usually fastened with wire clips or aluminum buttons.

The Signs of Problems with Them

  • A loss of compression
  • Overly noisy pistons
  • A seized piston
  • A pin falling into a piston
  • A piston locking onto the pin

Pins falling into pistons indicate that they're inadequately lubricated. Pistons locking onto pins, however, can cause engine seizure. Broken connecting rods and a busted block could result in any case. See any of these, and you should run an engine inspection, followed by replacing any of the parts the results recommend changing. You're in luck: you can order what you need, right here.

Genuine BMW Motorrad Pistons with Rings and Wristpins for Sale Online -- Shop Now

We've got a complete catalog full. Be sure to browse it by model and year; it'll make finding what's compatible with your BMW bike go a lot more quickly and easily. Buy now, and we'll ship and deliver ASAP, right to your address.

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Piston 'Ab'
$668.09
Part Number: 11257711122
Other Names: Engine Piston
Description: With gudgeon pin.
Fits:
  • BMW-Motorrad:
    • HP2 Sport
Piston 'Ab'
$605.82
Part Number: 11257721863
Other Names: Engine Piston Kit
Description: With gudgeon pin.
Fits:
  • BMW-Motorrad:
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R,
    • R 1200 RT,
    • R nineT,
    • R nineT Pure,
    • R nineT Racer,
    • R nineT Scrambler,
    • R nineT Urban G/S
Not For Sale
Not For Sale
Gudgeon Pin
$57.35
Part Number: 11251464475
Fits:
  • BMW-Motorrad:
    • K 1100 LT,
    • K 1100 RS
Gudgeon Pin
$102.34
Part Number: 11258409684
Fits:
  • BMW-Motorrad:
    • R 18,
    • R 18 B,
    • R 18 Classic,
    • R 18 Transcontinental
Not For Sale
Gudgeon Pin
$57.35
Part Number: 11257676245
Fits:
  • BMW-Motorrad:
    • K 1200 GT,
    • K 1200 R,
    • K 1200 R Sport,
    • K 1200 S,
    • K 1300 GT,
    • K 1300 R,
    • K 1300 S
Gudgeon Pin
$57.35
Part Number: 11258536336
Fits:
  • BMW-Motorrad:
    • M 1000 R,
    • S 1000 R,
    • S 1000 RR,
    • S 1000 XR
Gudgeon Pin
$82.50
Part Number: 11258530232
Fits:
  • BMW-Motorrad:
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R,
    • R 1200 RS,
    • R 1200 RT
Gudgeon Pin
$94.34
Part Number: 11251341365
Replaces: 11251342310
Fits:
  • BMW-Motorrad:
    • R 1100 GS,
    • R 1100 R,
    • R 1100 RS,
    • R 1100 RT,
    • R 1100 S,
    • R 1150 GS,
    • R 1150 GS Adventure,
    • R 1150 R,
    • R 1150 R Roadster,
    • R 1150 RS,
    • R 1150 RT,
    • R 1200 C,
    • R 1200 C Independent,
    • R 1200 C Montauk,
    • R 1200 CL
Gudgeon Pin - 22X13X58
Part Number: 11251335054
Fits:
  • BMW-Motorrad:
    • R 65,
    • R65,
    • R65LS
Not For Sale
Gudgeon Pin - D19X11X46
Part Number: 11258555200
Replaces: 11258563887
Fits:
  • BMW-Motorrad:
    • F 750 GS,
    • F 850 GS,
    • F 850 GS Adventure
Not For Sale
Gudgeon Pin - D19X11X48
$58.11
Part Number: 11258555206
Fits:
  • BMW-Motorrad:
    • F 900 R,
    • F 900 XR
Gudgeon Pin - D17X10X40
$132.81
Part Number: 11258536359
Fits:
  • BMW-Motorrad:
    • M 1000 RR
Gudgeon Pin - 22X13X74
$45.74
Part Number: 11251335474
Replaces: 11251335475
Fits:
  • BMW-Motorrad:
    • R 100 /T,
    • R 100 CS,
    • R 100 GS,
    • R 100 GS Paris-Dakar,
    • R 100 R,
    • R 100 RS,
    • R 100 RT,
    • R 80,
    • R 80 G/S,
    • R 80 RT,
    • R 80 ST
Gudgeon Pin - Ks
Part Number: 11251460815
Fits:
  • BMW-Motorrad:
    • K 100,
    • K 100 LT,
    • K 100 RS,
    • K 100 RT,
    • K 75,
    • K 75 C,
    • K 75 RT,
    • K 75 S
Not For Sale
Gudgeon Pin - D22X18X68.7
Part Number: 11257675304
Replaces: 11252343069, 11252343442
Fits:
  • BMW-Motorrad:
    • F 650,
    • F 650 CS,
    • F 650 GS,
    • F 650 GS Dakar,
    • F 650 ST,
    • G 650 GS,
    • G 650 GS Sertao,
    • G 650 Xchallenge,
    • G 650 Xcountry,
    • G 650 Xmoto
Not For Sale
Gudgeon Pin - D18X11X50
$57.35
Part Number: 11257722754
Description: Only applies to.
Fits:
  • BMW-Motorrad:
    • F 650 GS,
    • F 700 GS,
    • F 800 GS,
    • F 800 GS Adventure,
    • F 800 GT,
    • F 800 R,
    • F 800 S,
    • F 800 ST
Kolbenring
$17.92
Part Number: 31427695392
Other Names: Piston Ring
Fits:
  • BMW-Motorrad:
    • F 800 GS
Piston
Part Number: 11258535195
Other Names: Engine Piston
Replaces: 11257690407, 11257702885, 11257719358
Description: Important! Replace wristpin.
Fits:
  • BMW-Motorrad:
    • F 650 GS,
    • F 700 GS,
    • F 800 GS,
    • F 800 GS Adventure,
    • F 800 GT,
    • F 800 R,
    • F 800 S,
    • F 800 ST
Not For Sale
Repair Kit Piston Rings
$145.23
Part Number: 11001465302
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • K 1200 GT,
    • K 1200 LT,
    • K 1200 RS
Repair Kit Piston Rings
$78.35
Part Number: 11251256475
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$132.68
Part Number: 11257702433
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 650 GS,
    • F 700 GS,
    • F 800 GS,
    • F 800 GS Adventure,
    • F 800 GT,
    • F 800 R,
    • F 800 S,
    • F 800 ST
Repair Kit Piston Rings
$78.35
Part Number: 11251256474
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$78.35
Part Number: 11251337398
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 80,
    • R 80 G/S,
    • R 80 RT,
    • R 80 ST
Repair Kit Piston Rings
$117.89
Part Number: 11258566410
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • G 310 GS,
    • G 310 R
Piston Ring
$4.86
Part Number: 31422345384
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 650,
    • F 650 GS,
    • F 650 ST,
    • G 650 GS
Piston Ring
$4.01
Part Number: 31427660365
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 650 GS Dakar
Repair Kit Piston Rings
$78.35
Part Number: 11251259855
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$145.23
Part Number: 11251465178
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • K 1200 RS
Repair Kit Piston Rings
$78.35
Part Number: 11251337399
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 100 /T,
    • R 100 CS,
    • R 100 GS,
    • R 100 GS Paris-Dakar,
    • R 100 R,
    • R 100 RS,
    • R 100 RT
Piston Ring
$13.31
Part Number: 31422312848
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • K 75,
    • K 75 RT,
    • K 75 S,
    • R 100 R
Repair Kit Piston Rings
$212.62
Part Number: 11251342847
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 1200 C,
    • R 1200 C Independent,
    • R 1200 C Montauk,
    • R 1200 CL
Repair Kit Piston Rings
$78.35
Part Number: 11251256473
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$78.35
Part Number: 11251335217
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$183.64
Part Number: 11257652848
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • HP2 Enduro,
    • HP2 Megamoto,
    • HP2 Sport,
    • R 1150 GS,
    • R 1150 GS Adventure,
    • R 1150 R,
    • R 1150 R Roadster,
    • R 1150 RS,
    • R 1150 RT,
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R,
    • R 1200 RT,
    • R 1200 S,
    • R 1200 ST,
    • R nineT,
    • R nineT Pure,
    • R nineT Racer,
    • R nineT Scrambler,
    • R nineT Urban G/S
Repair Kit Piston Rings
$183.64
Part Number: 11258530295
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R,
    • R 1200 RS,
    • R 1200 RT
Repair Kit Piston Rings
Part Number: 11251256479
Other Names: Engine Piston Ring
Not For Sale
Piston Ring
$13.31
Part Number: 31422310376
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • K 1,
    • K 100 RS
Set Piston Rings
$136.45
Part Number: 11008404498
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 750 GS,
    • F 850 GS,
    • F 850 GS Adventure
Repair Kit Piston Rings
$78.35
Part Number: 11251256478
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$78.35
Part Number: 11251335218
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$212.62
Part Number: 11251342078
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 850 R,
    • R 900 RT 05 SF,
    • R 900 RT 10 SF
Repair Kit Piston Rings
Part Number: 11251337400
Other Names: Engine Piston Ring
Not For Sale
Repair Kit Piston Rings
$78.35
Part Number: 11251464247
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • K 1,
    • K 100 LT,
    • K 100 RS
Repair Kit Piston Rings
$78.35
Part Number: 11251259854
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$135.18
Part Number: 11252343266
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 650,
    • F 650 ST
Repair Kit Piston Rings
$212.62
Part Number: 11251342779
Other Names: Engine Piston Ring
Replaces: 11251341489, 11251342524
Fits:
  • BMW-Motorrad:
    • R 1100 GS,
    • R 1100 R,
    • R 1100 RS,
    • R 1100 RT
Set Piston Rings
$156.68
Part Number: 11259829368
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 900 R,
    • F 900 XR
Repair Kit Piston Rings
$78.35
Part Number: 11251259853
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$145.23
Part Number: 11251464586
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • K 1100 LT,
    • K 1100 RS
Set Piston Rings
$328.62
Part Number: 11258829497
Other Names: Engine Piston Ring
Replaces: 11257108478
Fits:
  • BMW-Motorrad:
    • M 1000 RR
Repair Kit Piston Rings
$78.35
Part Number: 11251256477
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$78.35
Part Number: 11251335287
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$78.35
Part Number: 11251256470
Other Names: Engine Piston Ring
Repair Kit Piston Rings
$78.35
Part Number: 11251337401
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 65,
    • R65,
    • R65LS
Repair Kit Piston Rings
$78.35
Part Number: 11251265506
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 100 /T,
    • R 100 RS,
    • R 100 RT
Piston Ring
$25.17
Part Number: 31427666228
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 650 CS,
    • F 650 GS,
    • F 700 GS,
    • G 650 GS
Repair Kit Piston Rings
$78.35
Part Number: 11251265505
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 100 /T,
    • R 100 RS,
    • R 100 RT
Piston Ring
$11.62
Part Number: 31427702841
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • F 800 GT,
    • F 800 R,
    • F 800 S,
    • F 800 ST
Repair Kit Piston Rings
Part Number: 11251335219
Other Names: Engine Piston Ring
Not For Sale
Repair Kit Piston Rings
$78.35
Part Number: 11251460994
Other Names: Engine Piston Ring
Description: *Fg K100 0 033 500/K100rs 0147 858/K100rt 0 097 101/K100lt 0 174 368/K100 usa 0 033 000 *fg K100rs usa 0 044 398/K100lt usa 0 180 968.
Fits:
  • BMW-Motorrad:
    • K 100,
    • K 100 LT,
    • K 100 RS,
    • K 100 RT
Repair Kit Piston Rings
$78.35
Part Number: 11251461958
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • K 100 LT,
    • K 100 RS,
    • K 100 RT,
    • K 75,
    • K 75 C,
    • K 75 RT,
    • K 75 S
Repair Kit Piston Rings
$183.64
Part Number: 11258565669
Other Names: Engine Piston Ring
Fits:
  • BMW-Motorrad:
    • R 1250 GS,
    • R 1250 GS Adventure,
    • R 1250 R,
    • R 1250 RS,
    • R 1250 RT
Repair Kit Piston Rings
$78.35
Part Number: 11251335284
Other Names: Engine Piston Ring
Piston Ring
$7.97
Part Number: 31428521288
Fits:
  • BMW-Motorrad:
    • G 650 GS Sertao
Piston Ring Compressor
Part Number: 83300430391
Replaces: 83300401622
Not For Sale
Gudgeon Pin - D=17 L=50
$57.35
Part Number: 11251464625
Fits:
  • BMW-Motorrad:
    • K 1200 GT,
    • K 1200 LT,
    • K 1200 RS
Piston
$295.62
Part Number: 11257729568
Description: With piston rings.
Fits:
  • BMW-Motorrad:
    • C 600 Sport,
    • C 650 GT,
    • C 650 Sport
Right Cylinder, Silver
$1,356.59
Part Number: 11117673530
Options: Right
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • HP2 Enduro,
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R
Right Cylinder, Black - Ab
$1,179.63
Part Number: 11117710478
Options: Right
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • HP2 Sport,
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R,
    • R 1200 RT,
    • R nineT,
    • R nineT Pure,
    • R nineT Racer,
    • R nineT Scrambler,
    • R nineT Urban G/S
Left Cylinder, Black - Ab
$1,179.63
Part Number: 11117710477
Options: Left
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • HP2 Sport,
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R,
    • R 1200 RT,
    • R nineT,
    • R nineT Pure,
    • R nineT Racer,
    • R nineT Scrambler,
    • R nineT Urban G/S
Right Cylinder, Black - A/B H=80.65
$1,356.59
Part Number: 11117673528
Options: Right
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • HP2 Megamoto,
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 RT,
    • R 1200 ST
Left Cylinder, Silver
$1,356.59
Part Number: 11117673529
Options: Left
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • HP2 Enduro,
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 R
Right Cylinder, Black
$1,356.59
Part Number: 11117689806
Options: Right
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • R 1200 S
Left Cylinder, Black
$1,356.59
Part Number: 11117689805
Options: Left
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • R 1200 S
Left Cylinder, Black - A/B H=80.65
$1,356.59
Part Number: 11117673527
Options: Left
Other Names: Engine Cylinder Base Cover
Description: Only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • HP2 Megamoto,
    • R 1200 GS,
    • R 1200 GS Adventure,
    • R 1200 RT,
    • R 1200 ST
Left Cylinder, Silver
$1,356.59
Part Number: 11117721955
Options: Left
Other Names: Engine Cylinder Base Cover
Description: For vehicles with classic [X144A (+)] only applies to piston "ab".
Fits:
  • BMW-Motorrad:
    • R 1200 R,
    • R nineT Pure
Piston
Part Number: 11251253168
Other Names: Engine Piston
Not For Sale
Piston
$446.57
Part Number: 11258405074
Other Names: Engine Piston
Fits:
  • BMW-Motorrad:
    • F 750 GS,
    • F 850 GS,
    • F 850 GS Adventure
Piston
$419.18
Part Number: 11251335465
Other Names: Engine Piston
Fits:
  • BMW-Motorrad:
    • R 100 /T,
    • R 100 RS,
    • R 100 RT
Piston
Part Number: 11251335434
Other Names: Engine Piston
Not For Sale
Piston
Part Number: 11251337991
Other Names: Engine Piston
Fits:
  • BMW-Motorrad:
    • R 100 /T
Not For Sale
Piston
$547.20
Part Number: 11251465284
Other Names: Engine Piston
Fits:
  • BMW-Motorrad:
    • K 1200 LT
Piston
Part Number: 11251253162
Other Names: Engine Piston
Not For Sale
Piston
Part Number: 11251335463
Other Names: Engine Piston
Description: Only applies to.
Fits:
  • BMW-Motorrad:
    • R 100 /T,
    • R 100 RS,
    • R 100 RT
Not For Sale
Piston
Part Number: 11250000648
Other Names: Engine Piston
Not For Sale
Piston
$310.41
Part Number: 11250000647
Other Names: Engine Piston
Piston
$605.82
Part Number: 11257659581
Other Names: Engine Piston
Description: Only applies to cylinder "ab".
Fits:
  • BMW-Motorrad:
    • R 1150 RS,
    • R 1150 RT
Piston
Part Number: 11251250206
Other Names: Engine Piston
Not For Sale

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