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Engine Motor Type Bore x Stroke Displacement Max Power Max Torque Compression Ratio Valves Per Cylinder Valve Control Carburation System Engine Lubricating System Power Transmission Clutch Number of Gears ear Selection Gearbox Ratios Rear Wheel Ratio Bevel/Crownwheel Electrical System Ignition System Alternator Starter
Spark Plugs Four-stroke two cylinder horizontally opposed “Boxer” engine, air cooled 82 x 61.5 mm (3.22 x 2.42 in)
649.6 cc 48 hp (35 KW) at 7,250 rpm or 27 hp (20 Kw) at 5500 rpm 47.8 Nm / 35 ft lb at 3,500 rpm or 45.5 Nm / 33 ft lb at 3,500 rpm 8.7 : 1 or 8.4 : 1 2 OHV, using push rod and rocker arm 2 constant depression carburettors, Bing
64/32/359 – 64/32/360 or 64/26/317 – 64/26/318 Wet sump Dry single plate, with lever action diaphragm spring
5 Dog type gearbox (ratchet foot lever) 4.4 / 2.86 / 2.07 / 1.67 / 1.50

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BMW 1200 1200 1150 1100 1100 1000 1000 1000 1000 900 850 800 800 800 750 750 750 750 750 650 650 600 600 500 BUELL 1200 1200 1200 1000 DUCATI 860 750 500 HARLEY DAVIDSON 1570 1570 1450 1450 1340 1340 1340 1200 883 HONDA 1800 1500 1200 1100 1000 1000 900 750 750 650 650 650 600 400 200 150 150 125 K1200RS, LT R1200C R1150GS, R R1100GS/R R1100RS/T/S/LT “K” Models R100/7 100RS R100GS, R, RS, RT R90/6, R90S R850R R80GS, R80ST R80, R80RT R80/7/RT K75, RT K75C, S R75/5 R75/7 R75/6 R65 R65LS R60/5 R60/6, R60/7 R50/5 S1 Lightning X1, S3, S3T, M2 S2/T, RS1200, RR1200 RR1000 GT, GTS GT, Laguna Seca GTL, GTV, Sport FXST, FLST FXD FXD FXST, FLST FXD FXST, FLST FL/H/T/HT XL, XLH XLH, XLH GL1800, VTX1800C Gold Wing-All Gold Wing-All Gold Wing-GL1100 CBX1000, SS opt. Gold Wing-GL1000 CBR900R,RR CB750A (Hondamatic) VFR740R/ RVF750R NT650, SLR650, NX650 Vigor 650 XR650L VT600C, CD, CBR600 CBR400F CB-1 TR200 Fat Cat CH150 Elite FES150 FES125, Pantheon (97 -) (98 -) (00 -) (94-00) (90 -) (83-93) (76-84) (83) (87-95) (69-76) (95-97) (80-96) (84-95) (78-84) (85-95) (85-95) (70-73) (76-84) (69-76) (84-95) (78-84) (70-73) (69-84) (70-73) (96-99) (ALL) (ALL) (87) (2007) (2007) (99-06) (00-06) (97-99) (91-99) (80-96) (97-03) (97-02) (01-06) (88-00) (84-87) (80-83) (82) (75-79) (93-99) (76-78) (90/94) (88-91) (ALL) (93-06) (87-03) (89-90) (86) (87) (ALL) (ALL) #3561 #3561 #3561 #3561 #3561 #4989 #4989 #3561 #4989 #4989 #3561 #3561 #4989 #4989 #4989 #3561 #3561 #4989 #4989 #4989 #3561 #3561 #4989 #3561 #3591** #3591 #3591 #3591 #4989 #4989 #3561 #3591 #2528 #2528 #3591 #2528 #3591 #3560 #2528** #2528** #2528 #3560* #3560* #3560* #3560* #3560* #2519* #3560* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* PC680 PC680 PC680 PC680 PC680 PC925L PC925L PC680 PC925L PC925L PC680 PC680 PC925L PC925L PC925L PC680 PC680 PC925L PC925L PC925L PC680 PC680 PC925L PC680 PC545MJ PC545MJ PC545MJ PC545MJ PC925L PC925L PC680 PC545MJ PC545 PC545 PC545MJ PC545 PC545MJ PC680MJ PC545 PC545 PC545 PC680MJ PC680MJ PC680MJ PC680MJ PC680MJ PC310 PC680MJ PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 cc model (year) cat. # mfg sku # KAWASAKI 1500 1500 1300 1000 1000 900 900 750 750 650 636 600 600 KTM 640 620 400 400 MOTO GUZZ I 1100 1100 1100 1000 1000 850 850 750 650 650 650 500 POLARIS All SUZUKI 1400 900 750 750 750 650 600 600 600 600 400 TRIUMPH 600 YAMAHA 1600 1300 1300 1200 1100 1100 1100 920 600 600 VN 1500-A Vulcan VN 1500-C Vulcan KZ 1300 Touring KZ 1000-P Police Z1000 ZX900-C, Ninja ZX900-E, F Ninja KZ750-L, Ninja Zx750 Ninja ZX, 7RR KLX650C, R ZX636-B Ninja ZX-6R ZX600-G, J Ninja ZX ZX600-K Ninja ZX Adventure, Duke, RXC Adventure, Duke, LC4 LC4 E/XC RXC LC4 Cali/Spc/Jackl/Stone/EV Quota/Sport 1100 VII EV/Bassa California III,Quota,Millie Convert,Daytona, LeMans LeMans T3, T4, T5 Nevada,NTX,Strada,V7,V75 NTX V65 V65 Florida V50 Victory GV 1400GC RF900, R, S, ZS GSX750F Katana GSX-R750 GSXR750W DR650SE GSF600S Bandit GSX600F Katana GSX-R600 RF600R, S GSF400 Bandit Daytona 600 XV 1600 Road Star 1300 Royal Star XVZ Venture Royale XVZ12T Venture XJ1100 Maxim XS 1100, L, S XV 1100, S/ Virago XV 920/R/M Virago XJ600S Seca II XT600E (87-98) (96-97) (79-82) (82-05) (03-04) (98-99) (00-04) (93) (91-97) (93-96) (03-04) (98-02) (03) (99-02) (96-98) (96-98) (96-01) (94-05) (97-02) (98-99) (ALL) (86-88) (94-97) (98-03) (96-99) (94-95) (96-04) (96-03) (98-04) (97-03) (94-96) (91-93) (03-04) (99-03) (96-03) (86-92) (83-85) (82) (78-92) (86-99) (81-83) (92-98) (90-95) #3560 #3560 #3560 #3560 #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #4989 #2528 #4989 #4989 #4989 #4989 #4989 #3561 #3561 #4989 #3561 #4989 #2519* #3560 #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2528*** #2528*** #3560 #3560 #3560 #3560 #3560 #3560 #2519* #2519* PC680MJ PC680MJ PC680MJ PC680MJ PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC925L PC545 PC925L PC925L PC925L PC925L PC925L PC680 PC680 PC925L PC680 PC925L PC310 PC680MJ PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC545 PC545 PC680MJ PC680MJ PC680MJ PC680MJ PC680MJ PC680MJ PC310 PC310

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An Airhead spline lube is a necessary maintenance task, covered extensively in some of the other online articles listed below. It’s actually a fairly easy job, and there are several good articles (see below) that cover all the details. I’m not sure if I’m adding anything to the general knowledge with this article, but I took some photos when I performed a spline lube on my 1986 R65 and 1984 R100RS, and I hope these somewhat poor quality photos can help. By the way, the 1986 R65 motorcycle is a later model “monoshock” with a “single-sided” swingarm, so the procedure may be slightly different than other Airheads, although I have since used the same procedure on my 1984 BMW R100RS and not much is different. In fact, I’d venture to say that the spline lube on the dual-shock R100RS is actually a bit easier; either that, or my experience with spline lubes is paying off!. The job took me about 3-4 hours the first time and less than 2 hours the second time. First thing I did was to pry off the two plastic covers over the swingarm nuts (pink arrow, photo left). I wanted to make sure that the 27mm socket I owned would fit in between the nut and the frame before I started the job, otherwise it would mean a trip over to Sears to see if I could find the correct socket. Fortunately, the 1/2″ drive 27mm socket I have worked fine without any modifications on both the ’86 and ’84, although it just barely fit the ’84. Apparently, some BMW’s were not machined concentrically in this area, and the 27mm socket may have to be machined or ground to fit. Bob Fleischer goes into this in detail in his article listed above. By the way, a 1-1/16″ socket will also work, because 27mm is almost exactly 1.062. Some sockets may have too large a radius at their open edge, which may prevent enough of the socket’s “teeth” from grabbing the very thin swingarm nut. You may have to grind or machine off the end of your socket to fit. Craftsman sockets have a (bad) reputation for having too large a radius, which helps them slip easier over a nut, but can also make them slip off just as easy in tight spots such as this. Although most of my tools are Craftsman, and I’ve never really found this to be a problem.