Yamaha Maxim X xj700

Very rare American import only produced 85 and 86, was running fine up to recently but unfortunately compression issues force sale. *Turning but not sparking. *Possibly valves sticking I'm.told. *May be an easy fix for someone who knows their way around engines. *Starter recently reconditioned and new petcock plus serviced also. *Tyres at around 70% Will need trailer or van to bring it away. Would consider swap for cruiser 900 -1500 with cash going other way also. Try me.