If the choke pulloff is in the air horn, mounted vertically behind the choke tower, it's a 2100. If the choke pulloff is mounted horizontally on the passenger side external to the carburetor, it's a 2150.
Yes I made sure the spring was in the fork, I double checked it.
I just noticed in the pic you just posted that it appears to have a piston in the vacuum hole, do the 2150 have that?
Because mine doesn't.
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