shrap66 wrote: I know this is an old post but does anyone have some experience with this exhaust system ?
I am talking about the PMC ''The Cross Plating Cross 4-IN-2 Megaphone Exhaust System''
On Z1 its called the 4-2 ZE Cross.
Wonder if I could install it on my 1979 KZ1000 Ltd. It has a Mark II engine.
Seems like the mufflers attach to the rear foot pegs.
Don't know if the PMC system will fit your bike, but some may find a little history of interest.
The head pipes both the PMC system and the one in your avatar look identical to the Jardine 4-2 crossover system that was produced in the mid '70's through sometime into the late 80"s. When Jardine ceased production of the 4-2 crossover system it was rumored the bending jigs were sold off. Perhaps PMC ended up with them.
Jardine's claim was that their system was a true, 180 degree tuned header with equal-length pipes that paired cylinders 1&4 into a collector, and cylinders 2&3 into the other, so that the negative exhaust pulse from one cylinder would arrive at the collector's transition at the precise moment the exhaust valve was opening at it's paired cylinder, which increased scavenging. To truly make the pipes exactly equal length required the asymmetrical bends seen in the headpipes. It was also true that full oil filter access was retained, as well as being compatible with the stock centerstand. 4-1 systems were just beginning to be offered and, some (us included) felt that the balanced look of two mufflers, one per side, were more aesthetically pleasing than a single muffler on one side.
After production of the Jardine 4-2 crossover system for Z1's ended, Jardine continued to produce the same 4-2 crossover system for KZ 1000's for a few years. Although the KZ1000 headpipes would mate to a Z1 head OK, the headpipe angles and collectors were incompatible with Z1 frames unless some modifications were made and new hangers were fabricated.
Hooker also produced a 4-2 crossover system during the same period. It wasn't precisely tuned like the Jardine system was, as the headpipes were perfectly symmetrical at the cross, resulting in unequal length headpipes that were more aesthetically pleasing to some.
Some objected to the weight of 4-2's. Other's, ourselves included, preferred the balanced look & didn't really care about weight, especially when the systems were often replacements for OEM 4-4 systems that had rusted through.
We have a set of original Jardine 4-2 crossover headers feeding a set of two NOS Bassani collectors on one of our Z1's. Had to fabricate a simple hanger for the collectors. They have glass-packed, straight through large-bore "baffles", but are surprisingly quiet. They just rumble, without the objectionable high-frequency rasp. The sound is unique; even Standard Citizens pick up on it.
The OEM 4-4 Z1 systems breathed pretty well as produced, and we've made no jetting changes for the Jardine/Bassani system.
Good Ridin'
slmjim & Z1BEBE