The Honda CB450 Police Special Siren


Tags: ,

honda cp450 

In the mid-1960s, most U.S. police motorcycles were big 74 cubic-inch Harley-Davidsons. But that didn’t stop Honda, always looking for new markets, from making a play for a piece of that police pursuit motorcycle pie with the Honda CB450 Police Special.

The CP450, as it was designated, was essentially a CB450 with added features appropriate for a police pursuit motorcycle. One of the most notable features is the siren. Pulling and holding a second hand lever below the clutch on the left handlebar engages a long, ribbed drive wheel, holding it against the right side of the rear tire. The drive wheel is mounted on a bell crank that pivots when the lever is pulled in, thus holding the drive wheel against the tire. A massive cable, rather like a super-sized tachometer cable, is driven off the ribbed wheel to the back of the siren, where it spins the siren mechanism. If you want the siren to really wail, pull the lever in more firmly and the pitch increases, while letting off the pressure lowers the pitch. Despite drawing its power off the driveline, there is no apparent drop-off in speed when it is engaged. Here's a quick video demonstrating what it sounded like to be pulled over by a CP450:  


Read more about this motorcycle: 
1967 Honda CB450 Police Special 

The sound and the fury: celebrate the machines that changed the world!

Motorcycle Classics JulAug 16Motorcycle Classics is America's premier magazine for collectors and enthusiasts, dreamers and restorers, newcomers and life long motorheads who love the sound and the beauty of classic bikes. Every issue  delivers exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made!

Save Even More Money with our RALLY-RATE plan!

Pay now with a credit card and take advantage of our RALLY-RATE automatic renewal savings plan. You save an additional $5.00 and get 6 issues of Motorcycle Classics for only $29.95 (USA only).

Or, Bill Me Later and I'll pay just $34.95 for a one year subscription!

Facebook Pinterest Instagram YouTube Twitter