Vintage Dirt Bike Q & A
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1972 Bultaco Alpina (250cc)
http://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=35&t=1949
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Author:  kmr [ Sun Jul 20, 2008 9:46 am ]
Post subject:  1972 Bultaco Alpina (250cc)

Last summer, after finally getting the timing right, the bike started right up, however, it did not want to idle down after throttle was applied. After sitting the entire winter/spring, I just took the carb. apart, and discovered a completely blocked pilot jet. I cleaned all the jets, and installed a new throttle cable. Put some fresh gas in, and, it started on the second kick, and went to wide open (not a stuck throttle as the slide is working fine). I quickly screwed the air screw all the way in (was out 3/4 turn per my manual) which had no effect. After getting it shut down, and letting my heartrate drop, I verified that the throttle cable was working properly, and started it again......same result. I had great hopes of riding around the grounds at this years Vintage Motorcyle Days at Mid-Ohio which in five days............I'm at a loss for an explanation, and would greatly appreciate any insights.

Thanks!

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