Can't get bike to run right

[tony27]

Jikov, head & barrel are the correct 73 parts from the bike.
When my dad bought it there were 2 almost complete sidepipe motors included with 1 of the top ends fitted due to the radial head & barrel having a melted piston, we were told someone forgot to take out the warming up plugs. I'll see if I can find the piston next time I'm at my parents & take a photo
Have been looking at what is missing or needs replacing in the sidepipe motors & plan on rebuilding them fully as I have the time/money, will probably use the top end that I had the liner out of as it's had the exhaust ports winged & the bore is perfect although the liner has had part of the spigot broken off & repaired

[tony27]

Bike ran well except for the first race when the fuel cap decided to stop breathing, was lent the cap off another guys bike when he said he was only going to ride his RM370 for the rest of the day. No leaks from the gasket at all which is good news