Got a call from old-school CZ builder Gary Davis today. A little over a year ago I visited Gary up at his home/shop in North Carolina. I left him several boxes that constituted my CZ380 motor. Back in the day Gary was known for his over-bored, reed-valved CZ motors and his inverted stinger expansion chambers.

Back in ’06 I contacted Gary to see if he was interested in building such a motor for me. I drove up and we did an initial tear-down and inspection on my motor, which had cratered a transmission earlier in the year. I left there around mid-December of ’06 with a list of stuff I needed to source for the rebuild. I went to work on it but weeks turned into months and before I knew it a year had passed. I have all the needed parts now. I Just need to get them together.

But as I said earlier, I think 2008 is going to be a CZ year. So over the holiday I started trying to get in touch with Gary. Finally heard from him today and we’re going to get together in Feb. to start the rebuild.

The motor will cc out at about 408 cc displacement, running a Yamaha 400 piston (I think). Gary also has a dyno in his shop so when we get it together we’ll dyno it and see what it does. Should be fun.

3 thoughts on “Project Big-bore lives

  1. I know Gary Davis from the San Francisco area in the ’70s. I have built a Penton 400 with a Yamaha reed cage, modern SX380 rod, Polaris piston, etc. Had to add about three pounds of brass to the flywheel to make it rideable, but is smooth and fast now. Good luck, say hi to Gary for me.

    • Hello JP. Nice to hear from you. I haven’t talked to Gary in quite some time but next time I do I’ll tell him you said hello. We haven’t actually gotten the bike running yet. I’m expecting there’ll be some vibration issues to deal with. But I’m looking forward to getting it out of moth balls going riding sometime next year.

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