Tensioner screw
Problem
An FZ150 motorcycle had high idle RPM. The RPM further increased when the handlebar was turned to the left or right.
Troubleshooting
The throttle cable tension was high. The upper throttle cable tensioner screw near the throttle grip was fully screwed down, so no further cable slack could be added.
Solution taken
The lower throttle cable tensioner screw was tackled to add more cable slack.
The impacts of not solving the problem
- Increased fuel consumption.
- Excessive engine heat.
- Unexpected motorcycle surge at low speed.
- Harder cornering.
- Harder gear engagement.
Notes
- The black right side cover (FZ150 part number 3C1-F1721-00) should be taken off for better access to the lower throttle cable tensioner screw. The cover is held by a 10mm AF bolt at the top (accessible by removing the seat), a PH2 truss head screw and two grommets. The two grommet connections can be released by prying by a spanner.
- The cable tensioner screw has two 10mm AF nuts, one upper and one lower.
- The space around the cable tensioner screw is limited and awkward. Use an offset open end spanner.
- Loosen the upper nut first, then tighten the lower nut so that cable tensioner screw is more screwed down, providing more cable slack.
Tools used
- 10mm offset open end spanner or flare nut spanner.
- PH2 screwdriver.
This is problem-first learning. The knowledge was learnt because there was a problem to solve.