Old ENYA 29 TV

ENYA 29 model 5224 with square shape intake port is waiting for burdening on PILOT Ace B after coming contest.  OS 703 muffler is set by way of one-off make adapter, Lost -Wax casting method was utilized for the purpose with the intention for my own handcraft.
Because a genuine Hi-Compression head was set, the compression ratio adjusting shims were fabricated from 0.20 mm thickness aluminum sheet.
Probably, this kind of actual cut & try experiment would be required whenever the compression ratio is changed, this is like a maker researching and developing division engineer's revel trial, in addition to establishing the stability at low speed, doing the transition and connectivity from lo to hi, lo to middle and middle to hi. This is not an easy task but an interesting one because keen concentration and patience are required on the way.