Motorcycles

 

GRM Islo TrialsMaster Restoration

 

What have I gotten myself into this time? A good friend of mine, the most serious car enthusiast I know, got the vintage motorcycle bug a few years ago. He has already amassed a small museum's worth of rare motorcycles. Trouble is they're almost all in pieces. And that's where I come in, volunteering to assist in the restoration of a very rare American trials bike.


GRM stands for Grapevine Racing Motors, a small company started by Mr. Bill Grapevine back in the early 1970's.  He designed the bike and then had them manufactured by Moto Islo, a Mexican manufacturer.  It had an unusual one-piece fiberglass fueltank/seat unit and makes for a very unique-looking motorcycle.  How long it takes us to get her back to 100% is anyone's guess.  Here's what she looked like to begin with:

 

February 2007:

Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster
Head bearings out.  Nothing a torch and some hammers couldn't take care of.
Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster

 

I had an especially hard time removing the swingarm retaining bolt.  It had an unusual head shape plus I couldn't tell if it was pressed or threaded in.  After many hours (and after destroying the bolt), turns out it was threaded in.  It hasn't helped that there's almost no documentation on these bikes.  With everything disassembled and the head bearing pressed out, it was finally time to have the frame and swingarm beadblasted and powdercoated. 

September of 2007: Frame and swingarm back from the powdercoaters and ready to go.
Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster

Grapevine Racing Motors TrialsMaster
Now on to the engine...

 

Return to Motorcycles