Me on the Sherpina at the 2007 3D Picnic Trail in Oneonta, NYAt first, turning an Alpina into a Sherpa-T (aka Sherpina) seemed fairly easy. The Alpina is actually based on the Sherpa-T with a larger fuel tank and seat, high front fender and motocross/enduro style handlebars... Oh, and of course, knobby tires. In fact there are quite a few riders out there using Alpinas for vintage trials. However these are only outward appearances. In reality there are a number of differences between the two that go well beyond what you can see.
While I've never been able to compare the two, I'm told the transfer ports in the cylinder are larger on the Sherpa-T, which often results in a cracked cylinder. I'd certainly like to know if there's some truth to that rumor. Other things I've discovered is the Sherpa-T has a larger flywheel on the primary drive side. At least that was the case when I compared a basket-case Model 91 Sherpa-T (250) with my Model 98 Alpina (175 with a 250 cylinder). Another difference is the primary drive on the Model 91 is a single-row roller chain while my Model 98 came with a double-row roller chain. Another item I found, courtesy of (Hugh's) Bultaco Motorcycles was that first, second and third gears are a lower ratio in the Sherpa-T, but fourth and fifth are the same ratio as the Alpina. Finally, the rear shocks are a smaller diameter on the Sherpa-T. There are also differences in the lower triple clamp and the front brake is a full-width hub on the Model 98. However I've seen pictures of a Model 80 Sherpa which has the same lower triple clamp and front brake hub as my Model 98. This leads me to believe that the Alpina was assembled from leftover Sherpa-T parts.
Most of this information I discovered long after I started converting my Alpina into a Sherpina and the bike you see me riding above was actually part-way through the conversion stage. Essentially this has been an ongoing project for the last 3+ years. So I'll break it down into the various stages. Stage One.
While I've never been able to compare the two, I'm told the transfer ports in the cylinder are larger on the Sherpa-T, which often results in a cracked cylinder. I'd certainly like to know if there's some truth to that rumor. Other things I've discovered is the Sherpa-T has a larger flywheel on the primary drive side. At least that was the case when I compared a basket-case Model 91 Sherpa-T (250) with my Model 98 Alpina (175 with a 250 cylinder). Another difference is the primary drive on the Model 91 is a single-row roller chain while my Model 98 came with a double-row roller chain. Another item I found, courtesy of (Hugh's) Bultaco Motorcycles was that first, second and third gears are a lower ratio in the Sherpa-T, but fourth and fifth are the same ratio as the Alpina. Finally, the rear shocks are a smaller diameter on the Sherpa-T. There are also differences in the lower triple clamp and the front brake is a full-width hub on the Model 98. However I've seen pictures of a Model 80 Sherpa which has the same lower triple clamp and front brake hub as my Model 98. This leads me to believe that the Alpina was assembled from leftover Sherpa-T parts.
Most of this information I discovered long after I started converting my Alpina into a Sherpina and the bike you see me riding above was actually part-way through the conversion stage. Essentially this has been an ongoing project for the last 3+ years. So I'll break it down into the various stages. Stage One.
want to get an older 250MX bike, liked the Buls but heard about primarys breaking or stretching,
ReplyDeleteis this a fallacy, or a bad comment from ill knowledge people?
Like the 74 Pursang. was looking at elsinores but like the Pursang better.
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