[[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]]
====== IH: General Technical Information ======
\\
====== 1970 - 1977 ======
====== 1970 - 1977 Service Intervals ======
===== Regular Service Interval =====
^ |Grease|Oil|Service|
|Every 1000 Miles| |Rear Chain|
* Air Cleaner
* Battery Rear
* Rear Chain Adjustment
* Gasoline Valve, lines and fittings
* Check fastener tightness
|
|Every 2000 Miles|
* Rear Brake Shaft
* Front Brake Shaft
* Rear Brake Cross-over Shaft (1974 & earlier)
* Clutch Release Worm (1970)
* Foot Shift Lever
* Seat Bar Roller and Bolt
* Kick Starter Shaft
* Rear Wheel Hub
* Speedometer Drive (1973 & later)
* Foot Shift Crossover Shaft (1975-76)
|
* Rear Brake Rod Clevis
* Front Brake Cable Clevis
* Clutch Hand Lever
* Brake Hand Lever
* Clutch Control Cable
* Front Brake Cable
* Throttle Control Cable
* Seat Post (saddle only
|
* Tappet Adjustment
* Clutch Adjustment
* Brake Adjustment
* Oil Filter
* Front Chain Adjustment
* Rear Chain Oiler (1976 & earlier)
* Circuit Breaker Points
|
|Every 5000 Miles|
* Throttle Control Spiral
* Circuit Breaker Camshaft
* Front Wheel Hub (1964 & earlier)
* Speedometer and Tachometer Cables
| |
* Check Front and Rear Fork Bearing Adjustment
* Replace Spark Plugs and Oil Filter Element
* Inspect and switch tires
* Time Ignition
* Clean Gas Tank Strainer
* Check Generator Brushes
* Check Shock Rubber Bushings
* Change Front Fork Oil (1973 & later)
* Change Brake Fluid
|Every 10000 Miles|
* Repack Rear Fork Pivot Bearings
* Repack Wheel Bearings
| | |
|Weekly| | |
* Check Tires and Battery
|
((Harley Davidson 1970 - 1977 Service Manual))
[[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]]
===== Service Interval Engine and Transmission =====
^ |300 Miles|1000 Miles|2000 Miles|5000 Miles or 1 Year|Spring and Fall|
|Engine Oil|Check|Check|Change| |Change|
|Transmission Oil| |Check| |Change|Change|
((Harley Davidson 1970 - 1977 Service Manual))
POC for this page --- //[[bplinson@gmail.com|Bert Linson]] 2016/01/20 20:03//
====== 1970 - 1977 Sportster Fastener Torque Requirements ======
===== Chassis =====
*Axle Nut: 50 ft-lbs / 67.79 Nm
*Brake Disc Mounting Screw: 35 ft-lbs / 47.45 Nm (1973)
*Brake Disc Mounting Screw: 10 ft-lbs / 13.5 Nm (1974 & later)
*Fork Stem Pinch Bolt: 20 - 25 ft-lbs / 27.11 - 33.89 Nm
*Handlebar Clamping Bolt: 20 ft-lbs / 27.11 Nm
*Front Caliper Bolt: 35 ft-lbs / 47.45 Nm
*Front Brake Disc Bolt: 35 ft-lbs / 47.45 Nm
===== Engine =====
*Gear Shaft Nut: 100 - 120 ft-lbs / 135.6 - 162.7 Nm
*Sprocket Shaft Nut: 100 - 120 ft-lbs / 135.6 - 162.7 Nm
*Crank Pin Nut: 150 ft-lbs / 203.37 Nm
*Rocker Arm Cover Screw: 20 ft-lbs / 27.11 Nm
*Cylinder Head Bolt: 65 ft-lbs / 88.12 Nm
*Carburetor (Tillotson) Inlet Seat Assembly: 40 - 45 in-lbs / 4.519 - 5.084 Nm
*Carburetor (Tillotson) Accelerator Pump Channel Plug: 23 - 28 in-lbs / 2.598 - 3.163
*Clutch Hub Nut (1971 & later): 150 ft-lbs / 203.37 Nm
*Gear Cover Screws, Chain Cover Screws, and Oil Pump: 100 in-lbs / 11.298 Nm
===== Electrical =====
*Spark Plug: 20 ft-lbs / 27.11 Nm
*Starter Motor Thru Bolt (Prestolite): 20 - 25 in-lbs / 27.11 - 33.89 Nm
*Starter Motor Thru Bolt (Hitachi): 20 - 25 in-lbs / 27.11 - 33.89 Nm
[[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]]
====== 1970 - 1977 Sportster Engine Specifications ======
===== Valves =====
*Fit in Guide (EX): .0025 - .0045 in
*Fit in Guide (IN): .0015 - .0035 in
*Spring (outer)
* 55 - 66 lbs. @ 1-9/32 in. (valve closed)
* 152 - 168 lbs. @ 15/16 in. (valve open)
*Spring (inner)
* 30 - 36 lbs. @ 1-3/32 in. (valve open)
* 76 - 88 lbs. @ 3/4 in. (valve closed)
*Spring free length:
* 1-1/2 in. (outer)
* 1-23/64 in. (inner)
===== Rocker Arm =====
* Fit in bushing: .001 - .0025 in. Loose
===== Piston =====
*Fit in cylinder: .003 - .004 in. loose
*Ring Gap: .015 - .025 in.
*Ring side clearance: .0035 - .005 in.
*Piston pin fit: Light hand press fit at 70 degrees Fahrenheit.
===== Connecting Rod =====
*Piston pin fit: .0008 - .001 in. loose
*End play between flywheels: .005 - .001 in.
*Fit on crank pin: .0005 - .001 in. loose
===== Oil Pump Pressure =====
At 60 MPH in high gear (oil hot).
*Minimum: 10 lbs. / sq. in.
*Maximum: 20 lbs. / sq. in.
=====Tappets=====
*Guide fit: .0005 - .001 in. press
*Fit in guide: .0005 - .001 in. loose
*Roller fit: .0005 - .001 in.
*Roller end clearance: .008 - .010 in.
*Tappet clearance: Just free (no lash) - Engine cold
===== Cam Gear Timing =====
*Intake
* Opens: 79 - 85 degrees BTC
* Closes 79 - 85 degrees ABC
* Exhaust
* Opens: 81 - 89 degrees BBC
* Closes: 76 - 84 degrees ATC
=====Gearcase=====
*Intermediate gear shaft
* In bushing: .0005 - .001 in.
*Cam gear shaft in bushing: .0005 - .002 in.
*Cam gear shaft
* In needle bearing: .0005 - .003 in.
* Cam gear end play
* 1976 & earlier: .001 - .005 in.
* 1977 & later: .003 - .007 in.
* Cam gear backlash: .000 - .0005 in.
=====Flywheel Assembly=====
*Gear shaft nut torque: 150 ft-lbs
*Sprocket shaft nut torque: 150 ft-lbs
*Crank pin nuts torque: 150 ft-lbs
*Runout (flywheels): .003 in. maximum at rim
*Runout (main shafts): .002 in. maximum
=====Sprocket Shaft Bearing=====
*Cup fit in crankshaft: .0005 - .0025 in. tight
*Cone fit on shaft: .0002 - .0015 in. tight
*End play: .001 - .007 in.
=====Pinion Shaft Bearing=====
*Shaft fit in roller bearing: .0005 - .0015 in.
*Shaft fit in cover bushing: .0005 - .0015 in.
=====Ignition Timing=====
*Breaker point gap setting
* 1970: .020 in.
* 1971 & later: .018 in.
* Dwell
* 1970 & 1971: 90 degrees @ 2000 rpm
* 1972 & later: 140 degrees @ 2000 rpm
* Spark plug gap setting: .025 - .030 in.
* Ignition timing - Advanced
* 1971 & earlier: 45 degrees (11/16 in. BTC)
* 1972 % later: 40 degrees (17/32 in. BTC)
* Ignition timing - Retarded
* 1971 & earlier: 15 degrees (5/64 in BTC)
* 1972 & later: 10 degrees (1/32 in BTC)
[[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]]