How much piston to valve clearance should you have?
We recommend at least . 080″ clearance between intake valves and pistons at all times, and at least . 100″ for exhaust valves, which expand more with heat.
How to adjust intake and exhaust valve clearances?
Turn the tappet in or out as necessary to adjust. You want to set your valve clearances to 0.004″ – 0.005″ on both the intake and exhaust valves. 5. Repeat Step 5 for the exhaust (lower) valve. 6. Tighten down the retainer nuts and re-check clearances (they sometimes tighten up a bit when you tighten the retainer.) 7. Replace the valve cover.
Where are the valve clearances on a CBF125?
On an engine, valves are situated in the cylinder head (‘top end’) and their job is to let fuel-air mixture in to the cylinder for combustion and to let burnt exhaust gasses out. The CBF125 uses the traditional ‘tappet and lock nut’ method for setting valve clearances, which is very common, if not universal, on simple, small displacement engines.
What happens if the valve clearance is too great?
If the valve clearance is too great, with a large gap between the tappet and valve stem, then the valve stem and tappet will wear more quickly as they’d be colliding against each-other with more force. The valves may also not open fully, which will cause poorer engine performance/idling.
How much torque does a Harley Davidson have?
Torque – 86 ft-lbs (108.8 Nm) @ 3500 rpm, chrome duals exhaust Bore – 3.75 in. (95.25 mm) Stroke – 4.00 in. (101.6 mm) Piston displacement – (approx.) 88 cu. in. (1450 cc)
What are the torque specs for the top end of C 15?
Reinstall the valve mechanism cover. Tighten the studs at Locations (3) , (4) , and (5) to a torque of 50 ± 5 N·m (37 ± 4 lb ft). Tighten the studs for an additional 45 ± 5 degrees. Tighten the stud at Location (2) to a torque of 65 ± 10 N·m (48 ± 7 lb ft). Refer to Specifications for more information. Install variable valve actuator (5) .
Do you need special tools to check valve clearance?
In most cases, specialty tools aren’t necessary; however, if they are, you’ll find that information in your service manual. 2. A critical tool to measuring valve clearance is a set of feeler gauges. Since the engine is going to be partially opened up and exposed, it is best to work on a clean machine.
What is the torque of a variable valve actuator?
Tighten the studs at Locations (3) , (4) , and (5) to a torque of 50 ± 5 N·m (37 ± 4 lb ft). Tighten the studs for an additional 45 ± 5 degrees. Tighten the stud at Location (2) to a torque of 65 ± 10 N·m (48 ± 7 lb ft). Refer to Specifications for more information. Install variable valve actuator (5) . Install bolt (3) . Install nuts (4) .
What’s the best Shim thickness for a valve?
When calculating what new shim thicknesses are required, it is best to target the specified clearance on the upper end of the prescribed clearance range, because valve clearances usually diminish over time. Valve shims are available in 0.025mm increments, so the shims that can be utilized will also influence the new clearances that can be achieved.