MacWorth Vintage ATVs has been scanning all the magazines and has created an awesome site. The article you are looking for is from June 1985 3-Wheeling Magazine.
https://www.vintageatvmagazines.com/...gazine-archive
MacWorth Vintage ATVs has been scanning all the magazines and has created an awesome site. The article you are looking for is from June 1985 3-Wheeling Magazine.
https://www.vintageatvmagazines.com/...gazine-archive
Hopefully these will show up clear enough .
78 atc 90/180cc Dickson Full Suspension
76 ATC90/180cc Nicholson
77 atc 90 Dickson Full Suspension
84 KLT 110/123cc Powroll Racer from 80s
87 atc 125m stock
84 atc 200x Curtis Sparks
84 atc 200x Powroll My race bike from 80's
83 atc70/108cc Powroll blue Xmas Special
81 atc185s HP-ATC full suspension
Performance Shop is Open PM me for Service
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Thanks very much guys. This is a good thing to bring back from the dead. Those guys watching must have been excited to see which one would perform the best! It looks like about 28 exhausts that were being tested and there were probably a few more. A few years ago I found a NIB "Superflow" that had a long megaphone on it, I had never heard of one before and I decided to keep it. ED- I just read the Dyno itself was also called a Super Flow, funny coincidence. And also kind of weird that only 1 pipe required a size higher main jet, the rest were fine with no air box lid and the stock carb. I think I myself have a tendency to jet a bit too rich when opening airboxes and and better flowing exhausts. I do usually have a cam and a 10:25 or 11:1 piston though. And, as they say, leaner is meaner.
Last edited by Dirtcrasher; 10-20-2025 at 04:01 PM.
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country
Mickey Dunlap pipes are good too!
Tomy ATC- my very first trike
1985 ATC 250SX
1984 ATC 200X
1985 ATC 200X - Bought from Yamada. Resto mod 230cc project
1985 ATC 70 - Full resto... girlfriend's bike
1984 ATC 70 - In restoration Lifan 120cc in project
1983 ATC 70 - Full OEM yard beater!!!!
1973 ATC 70 - resto project
1986 ATC 250R330 CT RACING
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3 TRI-ZINGER
2 ALT50
3 yamaha 200
He doesn’t make em anymore. I bought a Lexx muffler for a trx450r and sent the whole thing to HRE in Pennsylvania and he made me a custom header. Looks awesome. The Lexx comes with a remove ale quiet core / spark arrestor and has optional tuneable end caps.
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So....I used a 400ex LEXX muffler and turned a billet spacer adapter to mate my cobra pipe size to the 400ex pip size. It sounded good and bolted right out. I use these set ups on all the machines I build anymore for 4 strokes. Currently doing the same thing with a warrior.
Any machine shop can do it. The adapter slipped inside the 400ex pipe and slipped over the 200x pipe. I had photos but this all I can find anymore. It's a $225 muffler with tune-able tips for sound. I ran a turn down tip.
https://www.ebay.com/itm/18780283590...Bk9SR5jz2MH3Zg
Last edited by oldskool83; 01-14-2026 at 06:44 AM.
Tomy ATC- my very first trike
1985 ATC 250SX
1984 ATC 200X
1985 ATC 200X - Bought from Yamada. Resto mod 230cc project
1985 ATC 70 - Full resto... girlfriend's bike
1984 ATC 70 - In restoration Lifan 120cc in project
1983 ATC 70 - Full OEM yard beater!!!!
1973 ATC 70 - resto project
1986 ATC 250R330 CT RACING
![]()
3 TRI-ZINGER
2 ALT50
3 yamaha 200