[412usa]

Dorien,
I don't have a manual for the 403 but I think the key is to find out if you
have the small or large nosed crank. I can fax you pages from the 100 C, D
and D2 manual which covers both cranks and you can compare. The 405 manual
gives the same info but is not as clearly printed. However, I don't have
anything definitive on the 403 100A engine. The Arnolt uses the small nose
crank although with a different part number than the early 405 small nose
which is also a different part number to the early small nose on the C, D
and D2 series! Confused yet.

I will send you the scan of the crank data page and you decide.

Peter