b. Motorcycle Weaves from Side to Side. Adjust steering damper to suit speed and road conditions. If this fails, inflate tires to correct pressure. Make sure rear wheel mounting screws are tight. If the steering head bearings are too tight, weaving will result. Check the steering head bearings (par. [98]), and adjust if necessary.
c. Motorcycle Shimmies at High Speed. Inflate tires to correct pressure. Adjust steering damper to suit speed and road conditions. If the tire tread is unevenly worn, and shifting tires does not correct the condition, replace the defective casings. Make sure the axle nuts are tight. If the rocker plate studs and bushings are badly worn, or the fork springs are broken, replace (par. [98]).
Section XI
ENGINE
| Paragraph | |
|---|---|
| Description and data | [39] |
| Tune‐up | [40] |
| Replacement of head gasket | [41] |
| Carbon removal | [42] |
| Valve tappet adjustment | [43] |
| Replacement of oil feed pump | [44] |
39. DESCRIPTION AND DATA.
a. Description. This 2‐cylinder, V‐type, air‐cooled gasoline engine of L‐head design operates on the 4‐stroke, 4‐cycle principle. Flywheel and connecting rod assemblies operate on roller bearings. Engine is fitted with low‐expansion aluminum alloy, cam‐ground, horizontally slotted pistons and with deep‐finned aluminum cylinder heads. As viewed from left side of vehicle (drive chain side), rotation of engine is counterclockwise.
b. Lubrication system is of dry‐sump type, in which oil supply is maintained in a tank away from engine. Oil is circulated by a supply feed pump and a scavenger, return pump. This oil circulating system plays a most important part in cooling the engine as well as lubricating it.
c. Data.