Valve Adjustment Wrench | Honda CT90 / CB175 / CB200

Description

Valve Adjustment Wrench | Honda CT90 / CB175 / CB200

The valve adjusters on Honda CT90, CB175, CL175, SL175, CB200, and CL200 motorcycles use a small square-head tappet screw that standard wrenches cannot reach. This 3mm/4mm double box end wrench fits those square adjusters and makes valve clearance adjustments fast and accurateno more fumbling with pliers or adjustable wrenches in tight spaces.

Why You Need This

Valve adjustment is part of the standard tune-up on every CT90 and CB175/CB200-family engine. The sequence is cam chain, valves, then ignition timingin that order, because each step affects the next. We set the valves every 1,500 miles (2,400 km) as part of the standard tune-up. Without the correct wrench for the square-head adjusters, getting a precise clearance setting is nearly impossible. This wrench gives you clean, interference-free access to the adjuster screw while you hold the jam nut with a standard box wrench.

Also works with many Yamaha, Suzuki, and Kawasaki models that use 3mm or 4mm square-head valve adjusters.

Specifications

Note: A set of feeler gauges is also required for setting valve clearance. Remove individual blades from the holder when measuringthe weight of the full gauge set changes how it feels and makes it harder to get an accurate reading.

How to Use This Wrench

Difficulty: Beginner

Tools needed: This valve adjustment wrench, feeler gauge set, 8mm box wrench (CB175/CB200) or 9mm box wrench (CT90)

1. Remove spark plug(s) and tappet hole caps. Remove the stator/dynamo cover to access the rotor.
2. Rotate the crankshaft counterclockwise to find top dead center on the compression strokeput your finger over the spark plug hole and feel for pressure as the “T” mark aligns with the index mark.
3. Loosen the jam nut with your box wrench, then back off the square-head adjuster screw using this wrench.
4. Slide your feeler gauge between the rocker arm tip and the top of the valve stem.
5. Turn the adjuster screw down until you feel consistent, light drag on the feeler gauge.
6. Hold the adjuster screw in place with this wrench while tightening the jam nutdo not let the adjuster screw turn.
7. Re-check the clearance after tightening. If you cannot pull the gauge out, it is too tight. If it slides freely with no drag, it is too loose.

Pro tipthe overshoot method: Use the next size up feeler gauge (0.003″ instead of 0.002″) and set it slightly tight. A tight 0.003″ and a loose 0.002″ are close enoughand erring on the loose side is always better. Tight valves can cause cam and rocker arm damage. Loose valves just make a little noise.

CB175/CB200 note: These engines use a 360-degree crankshaftboth pistons move up and down together. After adjusting the left cylinder’s valves at TDC compression, rotate the engine 360 degrees to adjust the right cylinder.

Factory Valve Clearance Specs