31 355 front wheel shake

[Skip Lane]

When I hit a good bump with my 31 355 roadster, front wheels begin to shake pretty violently.  Have to almost stop for shaking to stop.  Do I need to check shocks? Alignment?  Help.
Thanks.

[Johan Boltendal # 158]

There is a good chance one or more of the modulator springs, at the left front shackle are missing,weakened or broken, this  will defenitely lead to the trouble you describe.Have a look at this at first, there are more issues to look at, but this is the most common to be at fault, Good luck, Johan