Just bought what appears to be a Gasser 125/160 water cooled barrel that looks like its been sleeved down to 80cc, that is, it's got a steel liner and a piston measuring 50mm across and a single dikes ring. Has anyone reading this heard of this conversion ?

Must date back to the 1990's when if memory serves me correctly there was an ACU schoolboy class capacity limit of 100cc.

Thanks lowbrow. For anyone mystified by this posting I can explain. I have been after a 160cc JTR barrel and head for some time and came across this modified barrel on eBay listed as having been modified with a steel liner-presumably because the original plated surface had worn. I have Identified the piston supplied as Yamaha YZ100 so whether this was a known modification or a one-off is unsure. It would be interesting to see if it actually works okay as a trials engine!!. Ports in barrel line up perfectly with the steel liner so whoever did the mod knew what they were doing!. I'm looking for a reed valve block and inlet stub if anyone can help?.