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This is a cylinder head for a 1975 Bultaco 250cc Pursang motorcycle. This is the start of my project to model the entire motocross bike. The Bultaco Pursang was my favor motorcycle to ride & race.
Rich - In my search for information for the Bulltaco, I discovered that there are 4 long studs and 2 short ones for a total of 6 head nuts. If the model you have is incorrect, I can upload the correct version.
That's why I was asking, I look at the photo you have posted, and it has 6 head bolt holes on top, and when I open your STEP file I see 6 holes on top, but when I rotate it to look at the bottom, I see 8 holes. That's what has me confused.
I just redownloaded the STEP file. When I look at the bottom I still see 8 holes, but the two most outer holes towards the flat sides maybe just the gasket that has the holes. When I tilt it back and forth, I only see 6 holes with edges that look like they go all the way threw. I was thinking this had thsame bolt pattern as my Skidoo 670 head.
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