Wow...sounds like a harley
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Wow...sounds like a harley
Its a rather humid cold day in Philly, and my Buddy 50 with a 70cc kit and the stock pipe is really running like a dog. Lots of bogging down between 30 and 40, hesitation, etc. So I got to thinking about the bolt in the stock exhaust ( located right before the expansion ). As I understand it, this is where an O2 sensor would go; use to adjust the carb. Well I assumed that much of the hesitation was due to excessive unburn fuel/air in the pipe, so I removed the bolt. It now sounds like a TY-250 I used to ride in high school, filling garing loud. Aceleration is much better, as is response. What does concern me is that 1) there is a small jet of blue flame which shoots out under deceleration, 2) I am partially bypassing the catalytic converter. So I reinstalled the bolt. What this does tell me is that a pipe will make a huge difference once one is available.
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Um... 70cc kit?
Eric // LA Scooter Meetup Group // Stella 4T // Vespa LX // Vespa LXS // Honda Helix // some, uh, projects…
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I think that this is the only scooter that you could say REALLY sounds like a Harley!!! http://www.vintagemotorssarasota.com/Ca ... ey1960.htm
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'06 Cream Buddy 125, 11 Blur 220, 13 BMW C 650 GT, 68 Vespa SS180, 64 Vespa GS MK II, 65 Lambretta TV 175, 67 Vespa GT, 64 Vespa 150 VBB 64 Vespa GL
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I was concerned about that. When the 70 cc kit went on, the carb was jetted up and it runs rich with the expectation of a new pipe. To date I haven't found a pipe.
As to the bolt droping the back pressure to much, while it does, I am unsure as to the extent. Although I don't have numbers, and it would be difficult to measure what is going on without affecting the situation by taking measurements; there is a significant ( more than half) amount of exhaust still comming out the stinger. I picked up a bunch of 8 mm bolts yesterday, and might try drilling various size holes in them.
Perhaps the best thing to do would be to get a hot Vino pipe ( same top end I think ) and weld on some new brackets.
Anyone have any sugestions as to which pipe?
As to the bolt droping the back pressure to much, while it does, I am unsure as to the extent. Although I don't have numbers, and it would be difficult to measure what is going on without affecting the situation by taking measurements; there is a significant ( more than half) amount of exhaust still comming out the stinger. I picked up a bunch of 8 mm bolts yesterday, and might try drilling various size holes in them.
Perhaps the best thing to do would be to get a hot Vino pipe ( same top end I think ) and weld on some new brackets.
Anyone have any sugestions as to which pipe?