1998 ZR 440 Black Magic twin pipes question - ArcticChat.com - Arctic Cat Forum
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post #1 of 23 Old 05-29-2019, 07:39 PM Thread Starter
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A couple years ago I acquired a NOS set of Black Magic twin pipes for my 1998 ZR 440. I am now In the middle of building the sled, but I can't figure out why the PTO side pipe has two threaded bungs welded into the center of the expansion chamber, one above the other, and both different sizes. The MAG side pipe doesn't have any bungs, and the two that are in the PTO side I would think are way too far back for EGT sensors. Does anybody know what these bungs were for? I'm just going to plug them, but I'm curious as to what these were for.
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Three in a row makes it go!

Last edited by Romp; 05-29-2019 at 08:28 PM.
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post #2 of 23 Old 05-30-2019, 12:51 AM
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Good question. Maybe the welder was drunk that day??

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post #3 of 23 Old 05-30-2019, 06:26 PM
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Definitely not for egt probes, those would go in the Y pipe 1” from gasket surface. They could be pipes for a newer model that had the temp sensor for ignition timing. So, just plug ‘em and run.
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post #4 of 23 Old 05-30-2019, 07:28 PM
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Definitely not for egt probes, those would go in the Y pipe 1” from gasket surface. They could be pipes for a newer model that had the temp sensor for ignition timing. So, just plug ‘em and run.
I was wondering if some later model SP pipes were mixed together? Did those not begin using pipe temp sensors in 2001?

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post #5 of 23 Old 05-30-2019, 08:33 PM
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I would say one is for a O2 sensor and the other may be for a mid pipe temp sensor to use on a dyno. Both of these would be used on a dyno for tuning. It could be also one is for a the old style O2 sensor and one for the new style O2 sensor. The new style is a faster acting O2 sensor and use a bigger thread diameter. There is one other thing one hole may have been to measure the pipe pressure at WOT to get the correct stinger diameter.
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post #6 of 23 Old 05-31-2019, 03:28 PM
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It might be because you put those on a "consumer" 98, which is a 97 ZR440 with ZR2 skin. The 98 race race sleds were still in ZR1 skin and had different motors that had cable-less power valves. But, I do not believe they had temp or O2 sensors, so those things are still a wonder?? It could just be whoever had them modified them for something. But that thing is CLEAN! Nice! Between my buddies and my brother and I, we have three 97's and three 98 consumers like yours. (6 out of 16 cats for 6 guys to ride) They're a blast. We call ours "the antiques."

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post #7 of 23 Old 05-31-2019, 07:13 PM Thread Starter
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Zrt1200 that could be, I was talking to a friend of mine about it yesterday and he also thought it may have been for dyno use with an o2 sensor.

Trp97 I found a listing In the black magic book and the 96-01 ZR 440, consumer 440, and zr 500 used the same twin pipes.

Thanks, it's a pretty clean machine. I've had it for 15 years, blew it up in 2005/2006 and started parting it out to fund a new project but still had most of the sled, I finally decided I needed to put it back together, this year, bought another one for parts a while back, im just about ready to send out some of the rear suspension parts to powder coat.
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Three in a row makes it go!

Last edited by Romp; 06-01-2019 at 08:34 AM.
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post #8 of 23 Old 05-31-2019, 08:07 PM
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Originally Posted by C-note View Post
I was wondering if some later model SP pipes were mixed together? Did those not begin using pipe temp sensors in 2001?

As best I recall, yes.
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post #9 of 23 Old 05-31-2019, 09:28 PM Thread Starter
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I was wondering if some later model SP pipes were mixed together? Did those not begin using pipe temp sensors in 2001?

As best I recall, yes.
Makes sense, if they were made to fit 96-01 and were all the same part number. I wasnt aware that the newer sno pros had sensors in them from factory.

Three in a row makes it go!

Last edited by Romp; 06-01-2019 at 09:42 AM.
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post #10 of 23 Old 06-04-2019, 09:15 AM
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I always wanted a set of these to play with. The cool thing about them is the “Quiet Cannister” as they called it. I believe it was a 94-95 ZR 700 can. I’d probably still choose to run the stock pipe for trails but if I was to build a lake racer I’d like to try these twins.
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