Losi LOSB0020 - Manual (Page 9)

2-Speed Adjustment
When new and during engine break-in, the two speed will not shift. Only after the engine has been
broken in and the needle valve adjusted, if necessary, will it start shifting. You may need to adjust the shift
point after a while as the shoes wear in.
Although pre-adjusted at the factory, the two speed can be adjusted to shift at the point that suits you
best. Under normal circumstances, it should shift slightly before the engine reaches maximum power. The
actual distance traveled will vary with the gear ratio and tune of the engine. There are two adjustment
screws (see fig 1) that must be changed evenly for the two speed to function correctly. Turning these
clockwise will make it shift later and require the engine to rev higher. Turning them counterclockwise will
make it shift earlier and require less engine speed. If you should get lost adjusting the two speed, start
over at the factory setting by lightly bottoming out the adjustment screws and then backing them out
five full turns. The procedure for adjusting the two speed is as follows:
• Remove the gear cover.
• Turn the spur gears until the adjustment hole is visible in the bell housing between the large and
small spur gears.
• Hold the small spur gear and, using your thumb, rotate the slipper forward until you can see the head
of one of the adjustment screws.
• Use a 5/64 Allen wrench to make your adjustment in 1/2-turn increments. Use the bent leg of the
wrench as your guide.
• Turn the slipper forward 1/2 rotation to adjust the other adjustment screw like the first.
(Remember to always adjust BOTH screws the same amount)
• Test drive the model to check the new shift point and replace the gear cover if satisfied.
• Never run your model without the gear cover, as it is dangerous and gear damage will occur!
Page 9
Turning the adjustment screws
counterclockwise makes the 2-speed shift
sooner; turning clockwise will make it shift later.
Figure 1
Always adjust BOTH adjustment screws evenly.
Note: Outer (1st)
spur gear removed
for photo
Later Sooner