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PARTS: Engine |
PRICE |
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Motorcycle ENGINE GASKETS 1951-1969 |
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Gasket set for R51/3 R50 R50s R50/2 R67 R60 R60/2 includes:
Oil pan, Oil pump strainer, Timing cover, Push rod grommets (4)
,Cylinder base (2), Cylinder head (2), Valve cover (2), Carb
intake (2), Exhaust (2). (Rear bearing carrier and Tach drive
cover are available separately if you need them) |
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Gasket
set for R68, R69, R69s includes: Oil pan, Oil pump strainer,
Timing cover, Push rod grommets (4), Cylinder base (2), Cylinder
head (2), Valve cover (2), Carb intake (2). (Rear bearing
carrier and Tach drive cover are available separately if you
need them) |
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Oil pan
gasket
R51/3 R50 R50s R50/2 R67 R60 R60/2 R68, R69, R69s. |
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Oil
pump pick up (strainer) gasket
R24 R25 R26 R27 R51/3 R50 R50s R50/2 R67 R60 R60/2 R68, R69,
R69s. |
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Timing
cover gasket
R51/3 R50 R50s R50/2 R67 R60 R60/2 R68, R69, R69s. |
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Rear
main bearing carrier gasket
R51/3 R50 R50s R50/2 R67 R60 R60/2 R68, R69, R69s. |
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Push
rod tube rubber grommet
R51/3 R50 R50s R50/2 R67 R60 R60/2 R68, R69, R69s. |
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Cylinder base gasket - paper
R51/3 R50 R50s R50/2 R67 R60 R60/2 R68, R69, R69s (On the R51/3
R67 R50 R60. |
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Cylinder head gasket
R26 R27 R51/3 R50 R50s R50/2 R67 R60 R60/2. |
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Valve
cover gasket
R24 R25 R26 R27 R51/3 R50 R50s R50/2 R67 R60 R60/2. |
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Carb
intake flange gasket
R24 R25 R26 R27 R51/2 R51/3 R50 R50/2 R67 R60 R60/2. |
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Exhaust
gasket copper ring
R51/3 R50 R50s R50/2 R67 R60 R60/2. |
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Cylinder head gasket
R68, R69, R69s. |
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Valve
cover gasket
R68, R69, R69s. |
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Carb
intake flange gasket
R50s R68, R69, R69s. |
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Tach
drive cover gasket
R50/2 R60/2 R69s (Standard
starting in 1966, not used earlier). |
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MAIN BEARINGS 1951-1969 |
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20207 C3 crankshaft spherical roller bearing (rear for the
R69 and S models) with the inner bore
measured. |
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6207 C3 crankshaft main bearing (front for all, rear for some)
with Nylon (polyamide) cages as per BMW service bulletin #238 17
Nov 1966. |
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R25 front and rear and R26 & R27 front main bearing 6206 (rear
is a 6207 as above). |
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CAMSHAFT AND GENERATOR BEARINGS
The /2, R26 & R27 engines use some other bearings that are
commonly available at bearing supply stores. All used two 6203
bearings to support the camshaft, and the R68 and R69 used a
third bearing on the cam shaft, a 6003. Also a 6203 (pre 1961)
or a 6004 (post 1961) bearing is used on the twin's crankshaft
just behind the generator rotor, and the R26 and R27 used a 6204
there. If your engine is quiet and clean inside, and you are
just doing a routine slinger cleaning I see no imperative to
replace the bearings. |
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Bearing
6203 |
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Bearing
6204 |
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Bearing
6003 |
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Bearing
6004 |
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ISETTA 250 and 300 ENGINE BEARINGS
Both main bearings for the 300 and the rear for the 250 are the
same as for the 1951-69 twins.
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Front main bearing for the Isetta
250 6206 with steel cage. |
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Dyna Start bearing (bearing on
crankshaft next to the Dyna Start)
6205 with steel cage. |
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BMW 600 AND
700 ENGINE BEARINGS |
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Rear main
bearing 6209 steel cage. |
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Front main
bearings 6208 steel cage. |
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Dyna Start bearing (bearing on
crankshaft next to the Dyna Start)
6206 with steel cage & shield. |
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BMW
Motorcycle ENGINE OIL SEALS 1951-1995
Made from Viton* with a coated outside diameter to help it seal
in the bore. I suggest you avoid using the more commonly
available Nitrile, as at operating temperature it tends to
harden. *Viton is a registered trademark of DuPont Dow Elastomer |
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Rear
Main (Flywheel)1951-69 twins and R26 R27
This is the one most prone to leaking |
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Crankshaft (Generator) 17mm Inner Diameter for pre 1961 or 20mm
ID for post 1961 twins |
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Camshaft (Magneto) 25mm Inner Diameter for all 1951-69 twins
except R68 & R69 (0.1 lb each) |
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Camshaft (Magneto) 28mm Inner Diameter for R68 & R69 |
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Crankshaft (Generator) R24-R27 |
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Rear
Main Seal R25. |
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Rear
Main Seal R11.
a drop in replacement for the original felt one - no machining
needed |
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Rear
Main Seal R66.
replaces original felt seal, rear bearing carrier will need to
be bored |
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Camshaft R27. |
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Camshaft 12mm Inner Diameter for 1970-75. |
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Crankshaft (Alternator) 1970-95 Airheads. |
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Rear
Main engine seal 1970-95 Airheads. Rigid type genuine BMW, and I
haven't a clue what material it is made from. Your local dealer
may be less expensive. |
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ENGINE OIL
SEALS ISETTA CARS AND BMW 600 AND 700
Made from Viton* with a coated outside diameter to help it seal
in the bore. I suggest you avoid using the more commonly
available Nitrile as at operating temperature it tends to
harden. |
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Rear Main
(Flywheel)
This is the one most prone to leaking
Isetta 250 300 and BMW 600 & 700. |
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Dyna Start end of the crank BMW 600 & 700. |
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Dyna Start end of the crank Isetta 250 & 300. |
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Cylinder base gasket - paper.
Isetta 250 and 300 |
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Cylinder head gasket Isetta 250 &
300. |
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Valve cover gasket Isetta 250 & 300. |
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PISTON RINGS FOR MOST EVERYTHING
- EVEN NON-BMW
NOT stock. The lower oil control ring is a three-part ring: two
thin chrome-plated steel rails and an expander between them.
These conform to irregularities in the cylinder walls better
than the stock ones. The middle ring is a two-part ring: one, a
nodular cast iron ring slightly larger in diameter than the
second, which is a chrome-plated steel ring. The end gap of one
piece is 180 degrees from the other, resulting in an endless
ring. The soft cast iron ring gives quick seating; the
chrome-plated steel ring provides long life. The top ring is a
conventional chrome-plated one. Two piston set. R50-R69s,
R60/5/6/7, R75/5/6/7, R90/s/6 R100/s/7/RT/T BMW are generally in
stock; others two week delivery. |
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LIGHTENED WRIST PIN
1955-69 stock wrist pins are 20mm outside diameter with a
straight wall. Depending on the piston maker, the dimensions
were either 12mm inside diameter, 55.5mm in length and 88g in
weight; or, 14mm inside diameter, 60mm length and 74g weight (or
whatever the piston maker felt like that week).
1970-95 stock wrist pins are 22mm outside diameter. For example
R75/5 are straight-wall with an inside diameter of 14mm and
length of 68.75mm weigh 122g.
Other diameters available on request |
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Lightened 20mm wrist pins with the inside diameters tapered,
55.5mm in length, are 55g those 60mm are 60g.... (other lengths
also available) |
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Lightened 22mm wrist pins with the inside diameter tapered,
68.75 mm in length are 99g ..... (other lengths also available) |
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PISTONS R60 R60/2 R69s R24 R25 R25/2 R25/3 R51 R51/2 R51/3 and
by SPECIAL ORDER R42 R35 R11 R12 R71 R4
Made by Kolbenschmidt, one of the original equipment
manufacturers for BMW pistons. |
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R69s
Standard (71.92mm), 1st (72.42), 2nd (72.92), 3rd (73.42) and
4th (73.92) over w/rings, pin and circlip. |
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R60/2
Standard (71.94mm), 1st (72.44), 2nd (72.94), 3rd (73.44) and
4th (73.94) over w/rings, pin and circlip. |
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R60
Standard (71.94mm), 1st (72.44), 2nd (72.94), 3rd (73.44) and
4th (73.94) over w/rings, pin and circlip. |
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R25
R25/2 R25/3 Standard (67.94mm) 1st (68.44) 2nd (68.94) 3rd
(69.44) 4th (69.94) over w/ rings, pin and circlip. |
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Piston
with rings as described above, PISTON RINGS FOR MOST EVERYTHING
EVEN NON-BMW (each). |
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R51
R51/2 R51/3 (1950-54) This is the same piston as the R24 R25
R25/2 R25/3, which has a compression height 0.5mm less than the
stock R51 R51/2 R51/3 pistons; which, with a standard size
piston, will slightly reduce the compression ratio from the
stock 6.3 to 1 to 6.1 to 1. If you are rebuilding your
crankshaft you may want to consider replacing the stock rods
that have 18mm wrist pin bushings with later rods with 20mm
bushings - and use later R50 and R50/2 1955-1969 pistons
(below). This will result in a 7.5 to 1 ratio and require the
carbs to be re-jet to R50/2 specifications. Standard (67.94mm),
1st (68.44), 2nd (68.94), 3rd (69.44) and 4th (69.94) oversize
w/rings, pin and circlip. |
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PISTONS R50 and R50/2 1955-1969 and 500cc R92
Marusho (Lilac)
Between 1955 and 1960 BMW used pistons which gave a compression
ratio of 6.8:1 and a rated horsepower of 24. After 1960, BMW
modified just the pistons to increase the compression ratio to
7.5:1 and the horsepower to 26. These are the later
high-compression pistons which will fit all years. |
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Standard, 1st, 2nd, 3rd and 4th oversize.
w/wrist pin, circlip and original
one piece style rings (each). |
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Piston with rings as described above, PISTON RINGS FOR MOST
EVERYTHING EVEN NON BMW (each). |
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PISTON (WRIST)
PIN BUSHINGS ALL 20MM PISTON PINS (1955-69 TWINS and ?)
A fair number of connecting rods have loose piston pin bushings.
To permanently solve this problem a new bushing is put in the
rod and a precisely sized hardened steel ball is pressed through
it. This causes the bushing to flow into the hills and valleys
of the con rod, locking it permanently in place, while leaving
an excellent surface finish and correct size. The bushings come
in 2 outside diameters to match the two sizes of connecting rod
pin holes that BMW used |
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Bushings. |
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Labor to
install new bushings.... |
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Press tool
with two bushings of each size (four bushings total).... |
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We also rent
the press tool. (*plus $13 for each bushing used ) |
rental* |
REGROUND
LIFTERS (FOLLOWERS)
It is unfortunately common for the lifters (also know as
followers, the part that the cam lobes are in immediate contact
with) to be pitted on 1951-1969 BMWs. I am offering to exchange
a reground one for your pitted one. The exchange lifters are
first lightly ground then hardfaced (a hard metal is welded onto
the surface) then ground to size. After 1969 BMW moved the
camshaft below the crankshaft where the flow of oil is more
copious, but if there is demand for later lifters I will include
them in the exchange program.
Hardfaced exchange lifter. |
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REGROUND and RECOUNTOURED CAMSHAFTS
We hard-face and return to original form worn or damaged
camshafts for 1953-69 BMW; as well as R51/2, R12 and 1970-95
Airheads. We can also do non stock modifications. |
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Exchange camshafts 1953-69 with the pits on your camshaft less
than .010 inch (.025mm). |
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