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Honda CB450 / CL450 Frequently Asked Questions

QUESTIONS ABOUT THE HONDA CB450 / CL450 / CB500T

HONDA CB450 / CL450 / CB500T Answers

What engine oil should I use for my CB450 / CL450 / CB500T?

Recommended oil viscosity for general riding and all temperatures is: SAE 10W-40.

We've also had success running diesel truck oil (Shell Rotella, Chevron Delo, Mobil Delvac) at 15W-40 viscosity. Diesel oil has the bonus of extra detergent additives as well as zinc which older engines need. Synthetic oils are are not recommended as they will cause your clutch to slip. We recommend adding 2-3oz. of Zinc additive with every oil change. 

How much engine oil do I need for my CB450 / CL450 / CB500T?

CB450 / CL450: 2.9 U.S. Quarts / 2.8 Lit.

How often do I need to change the engine oil on a CB450 / CL450 / CB500T?

Every 1,500 miles / 2,400 km.

What fuel should I use in a CB450 / CL450 / CB500T?

We recommend premium (92+ octane) fuel; if it can be found non-ethanol fuel as well.

What is the fuel capacity of a CB450 / CL450 / CB500T?

CB450 (K0-K1): 3.3 US gal., 12.5 lit.
CB450 (K2-K7): 3.6 US gal., 13.5 lit.

CL450 (K0-K4): 2.4 U.S. gal., 9.0 lit.
CL450 (K5-K6): 2.6 U.S. gal., 10.0 lit.

What size tires do I need for my CB450 / CL450 / CB500T?

Front Tire: 19-110/90 (modern sizing) / 3.25-19 (old sizing)
Rear Tire: 18-120/90 (modern sizing) / 3.50-18 (old sizing)

What is the correct tire air pressure for my for my CB450 / CL450 / CB500T?

Front Tire Pressure: 26 psi / 1.8 kg/sq. cm
Rear Tire Pressure: 28 psi / 2.0 kg/sq. cm

What size tire inner tube do I need for my CB450 / CL450 / CB500T?

Honda CL / CB450 / CB500T Rear: 18" x 3.25" - 4" Inner Tubes
Honda CL / CB450 / CB500T Front: 19" x 3.25" - 4" Inner Tubes

http://www.common-motor.com/honda-inner-tube

What spark plug do I need for my CB450 / CL450 / CB500T?

B8ES (NGK)

http://www.common-motor.com/honda-spark-plug-ngk

What is the spark plug gap for the CB450 / CL450 / CB500T?

Gap specification: 0.7 - 0.8 mm (0.028 - 0.032 in.)

What size fuse do I need for my Honda CB450 / CL450 / CB500T?

One 15A fuse

http://www.common-motor.com/honda-glass-fuses-15a

What size drive chain do I need for my Honda CB450 / CL450 / CB500T?

Standard (non O-ring) clip type master link drive chain with a 530 pitch will work.

Watch our YouTube video on how to count the links in your chain for the appropriate length.

http://www.common-motor.com/honda-cb-cl-cj-sl-cb350-cb360-cb450-drive-chain

How often should I lubricate and inspect the drive chain on my Honda CB450 / CL450 / CB500T?

Lubrication and inspection of the drive chain should be happening every 500 miles / 800 km.

The maximum slackness when measured by moving the drive chain vertically is 1 to 2 cm (0. 4~0. 8 in)

What are the carburetor stock size jets for my Honda CB450 / CL450 / CB500T?

The Honda 450 family bikes went through various main changes over the years of production and here are the jet sizes to the best of our knowledge. We have seen combinations of following:

Main Jet Primary (Needle Jet): #130, #135 or #145
Main Jet Secondary: #38
Idle Jet (Pilot Jet): #38

What is the carburetor float height for my Honda CB450 / CL450 / CB500T?

CB450 / CL450: Approximately 20 mm

How do I synchronize the carburetors on my Honda CB450 / CL450 / CB500T?

Watch our YouTube video on synchronizing the carburetors on a Honda CB450 / CL450.

How often do I need to set the ignition timing on my CB450 / CL450 / CB500T?

Every 1,500 miles / 2,400 km.

How do I set the ignition timing on my CB450 / CL450 / CB500T?

Watch our handy YouTube tutorial on setting your ignition timing.

How often do I need to replace the ignition points on my CB450 / CL450 / CB500T?

Inspect and set every 1,500 miles / 2,400 km. Consider replacing after 6,000 miles / 9,600 km.

What type of fork oil and how much fork oil should I use in my CB450 / CL450 / CB500T?

We recommend a 10W (light rider) to 15W (heavy rider) motorcycle fork oil. ATF is approximately 5W and replacing it with a heavier weight oil will stiffen up your front end.

CB450 / CL450 (K0-K4): 285~295 cc (17.4~18.0 cu in) of hydraulic fluid (factory spec)

Factory spec on the fork oil is of premium quality ATF (automatic transmission fluid).
CB450 K5: 155~165 cc (5.3~5.6 oz)
CB450 K6: 135~145 cc (4.6~4.9 oz)
CB450 K7: 135~145 cc (4.6~4.9 oz)

CL450 K5: 155~165 cc (5.3~5.6 oz)
CL450 K6: 155~165 cc (5.3~5.6 oz)

CB500T: 135~145 cc (4.6~4.9 oz)

How often should I change my front fork oil on my CB450 / CL450 / CB500T?

Every 5,000 miles / 8,000 km or once a year, whichever comes first.

What is the valve adjustment / tappet clearance specs for the Honda CB450 / CL450 / CB500T?

Intake & Exhaust: 0.03 mm (0.0012" in.)

This value is rather small we find that thinnest feeler gauge of 0.0015" (0.0381mm) is what is commonly available and works just fine.

What brake fluid should I use in my CB450 / CL450 / CB500T?

DOT 3 brake fluid.