June 29, 20188 yr I remember when i got my Bultaco, bought new plug gaped it to specks didn't even look like starting, went around to see a mate who raced go carts with Bulty motors in them. He said half the plug gap because the electrics don't throw a strong spark, started 2 kick
June 29, 20188 yr We don’t know exactly what model your bike is. You haven’t told us what the numbers are. You mentioned on the motor you see M and the frame you see B. What are the numbers after the letters ? Those numbers are a reference to what model it is. A M85 is an alpina 250. An M99 is a 350. So let’s say it is an M8500123. That would mean it is a 250cc alpina and that it was the 123’rd alpina built. Roughly that bike was produced from 71-73 but there’s no way of knowing. So write down your number and check the model reference list that was mentioned a few posts back. As mentioned the number will correlate to a model, a displacement , and rough year of manufacture. But without either checking it or posting here we can’t tell you for sure what it is steve
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