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Old 10-05-2012, 11:29 AM   #1
Pigford OP
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Question Identify this old Exhaust system???????

So, any idea's what pipe this is ????? It's off a Kawasaki Z1 / KZ900







No markings that I can see
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Old 10-05-2012, 01:29 PM   #2
Rob Farmer
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Thats a Jock Kerr. The worst exhaust and parts manufacturer ever, Made loads of noise and buggered your bikes performance. The only saving grace was the comedy factor of your mates swerving all over the road behind you when the baffle was fired down the road when the securing bolt inevitabley fell out. Throw it in the back of the garage as a 70/80s curiosity. I had them on a Guzzi V50 and a Morini 350 many years ago. They were pretty common on Kawasakis in the Midlands, I'll see if I've got any pics kicking about.

They also offered a nylon "blank" piston kit to turn your 250 into a 125

Another example of their exemplary products (found on the web) I'm sure a google will turn up many more :-

"Jock KERR ran a tuning outfit in Hertfordshire (near London, UK), in the
70's/80's, they did a sleeved down conversion for the 400/4 that took it to
250cc. The head was untouched, so the combustion chamber was mushroom
shaped, VERY inefficient. It allowed learner riders to ride the 400/4,
(limit was 250).
I had one, flat on the tank, 11,000rpm, in 4th or 5th, (can't remember
which!), I got nearly 70mph out of her!! :-)
Oh to be 17 again!!"

Rob Farmer screwed with this post 10-05-2012 at 01:55 PM
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Old 10-05-2012, 03:55 PM   #3
BOOTLACE
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Thats funny!
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Old 10-05-2012, 04:25 PM   #4
Airhead Wrangler
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Quote:
Originally Posted by Rob Farmer View Post
The only saving grace was the comedy factor of your mates swerving all over the road behind you when the baffle was fired down the road when the securing bolt inevitabley fell out.
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Old 10-05-2012, 07:53 PM   #5
bmwrench
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I was on my way to a new girlfriend's place one night when the baffle blew out of a MAC 2:1 on my hot-rod R100. When I left her place very late that night/early morning, every light in the neighborhood came on. I heard later that many of them thought we were under attack.

I'm still laughing about it almost 30 years later.
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Old 10-06-2012, 02:09 AM   #6
Pigford OP
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Cry

OK - Cheers for making my weekend Rob
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Old 10-06-2012, 03:08 AM   #7
Rob Farmer
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OK - Cheers for making my weekend Rob
Don't tell me. You were going to sell it to fund the rebuild
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Old 10-06-2012, 11:15 AM   #8
mudgepondexpress
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If you were in the states I would say it is a MAC. Had the exact muffler/baffle on my CM400 exhaust. As said previously....hideously loud, kind of a sharp buzz sound at high rpms...only performance increase was a severe loss in weight (boy were they thin).

Kenny
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Old 10-06-2012, 01:45 PM   #9
XS500RUS
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Quote:
Originally Posted by mudgepondexpress View Post
If you were in the states I would say it is a MAC. Had the exact muffler/baffle on my CM400 exhaust. As said previously....hideously loud, kind of a sharp buzz sound at high rpms...only performance increase was a severe loss in weight (boy were they thin).

Kenny
Haha I have a MAC 2-1 on my XS500, not thrilled either. Compared to my old 2-1 (not sure of brand, Hooker? S&S?) the MAC had awful ground clearance, was heavier, and was more restrictive yet LOUDER. I pulled the baffle and fabricated a straight flow core wrapped in fiberglass packing, a huge improvement in sound (quieter and less blatty) and power. The only reason i dumped my old 2-1 was because it was rusting through in multiple places and I was sick of clamping on old beer cans
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Old 10-07-2012, 03:16 AM   #10
Pigford OP
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Quote:
Originally Posted by mudgepondexpress View Post
If you were in the states I would say it is a MAC. Had the exact muffler/baffle on my CM400 exhaust. As said previously....hideously loud, kind of a sharp buzz sound at high rpms...only performance increase was a severe loss in weight (boy were they thin).

Kenny

Thin is a rather good description

Many thanx chaps !!!!!


And yes Rob, was going to put some funds towards more bike fettling !
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