Blair’s latest update on his J-Zeta engine.

The Jawa 350 (04) Kyvacka engine is now back together after lots of fettling. I had issues with small things, like neutral switch and gear selector mechanism being off a later model, which meant pulling the halves apart again, and a few other minor head scratching moments that come from basket case bikes. Fun challenge though, and I learnt a lot.

Parts and work include:

• Rebore to 58.5mm

• New pistons and rings

• New Clutch plates

• All bearings

• All seals

• New kick start mechanism, so has gear change and kick start separate, like an NZeta engine does.

All gears, clutch basket, clutch actuator mechanism, main and lay shafts, crank were the original ones, or other secondhand spares I had, just used the best of my parts stash.