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Does anyone know what the diameter of the secondary pipe is on most 4/1 systems? plan on fabbing up my own header and need to know what size I should make the secondary pipe. I was thinking 2 1/2 or 2 1/4?
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You will need to know what size mufflers are available. I have seen just about every size between about 1 3/4 and 3 inches.
The outside diameter of the collector on my bike measures 2.45". (I have been led to believe it is a Jardine system.)
The same measurement on my son's bike is 2.50". (That is on a MAC.)
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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Mom's first ride
Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
(Click on my username in the upper-left corner for e-mail info.) -
My Yosh is 2.5". Check out coneeng.com for a lot of materials for building pipes.Current Rides: 82 GS1100E, 00 Triumph 955 Speed Triple:twistedevil:, 03 Kawasaki ZRX1200, 01 Honda GL1800, '15 Kawasaki 1000 Versys
Past Rides: 72 Honda SL-125, Kawasaki KE-175, 77 GS750 with total yosh stage 1 kit, 79 GS1000s, 80 GS1000S, 82 GS750e,82 GS1000S, 84 VF500f, 86 FZR600, 95 Triumph Sprint 900,96 Triumph Sprint, 97 Triumph Sprint, 01 Kawasaki ZRX1200, 07 Triumph Tiger 1050, 01 Yam YFZ250F
Work in progress: 78 GS1000, unknown year GS1100ES
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