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I want to get a set of vacuum barbs for synching the carbs on my '78 GS1000. The manual says to remove the 4mm vacuum plug bolt but just to be sure, I measured it across the outside of the threads and it is 5mm. I seem to remember something about how some hardware is measured at the inside of the threads (it doesn't sound right, so I could be imagining it). My carbs are VM26SS...do I need a 4 or 5mm vacuum barb?
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The bolt's threads on the intake port is 5mm.85 GS1150E May '06 BOM
79 GS1000S Wes Cooley Beast
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Thank you, I thought so too but since the manual says the allen head plugs are 4mm I wasn't sure. I'm glad I measured and asked the question before ordering.Comment
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They might have meant that it takes a 4mm Allen wrench to remove them.
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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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