Losi LOSB0125 - Manual (Page 12)

12
Changing Gear Ratio
A 22-tooth clutch bell is mounted on the engine of your Speed-
NT. If you feel the need for greater speed an optional 23-tooth
clutch bell (LOSA9391) can be fitted by following these steps.
1. Remove 4-40 screw attaching the pipe mount to the
center brace. (Photo: SNT setting gear mesh 1
2. Remove the throttle link from the carburetor.
3. Remove the four 5-40 screws from the underside of the
chassis [that secure the engine].
4. Remove the screw from the end of the crankshaft making
sure to save all shims and spacers.
5. Remove the clutch bell, remove the two bearings and
install them in the new clutch bell.
6. Install the clutch bell onto the crank pilot shaft and replace
the shims and cap screw.
7. Replace the engine installing the four 5-40 screws from
beneath as well as the throttle link and pipe mount screw.
Adjusting the Gear Mesh
As seen in the photo above, the motor can be moved forward
and back to allow for multiple gear ratios and maintain a
good gear mesh. You don’t want these gears too tight and you
definitely don’t want them too loose.
1. Slightly loosen the four 5-40 screws at the bottom of the
chassis [that secure the engine].
2. Slide the engine back so that the gears are meshing.
3. Insert a piece of paper folded over double or a thin
business card between the gears as seen in the photo (SNT
setting the gear mesh 2).
4. Tighten two of the four 5-40 mounting screws while
applying slight pressure on the engine.
5. Remove the paper and check the mesh. If the gears roll
smoothly without binding or slapping back and forth
retighten the other 5-40 screws. If not, start over at #1.