Guys I need a bit of help. I have owned an 1988 NX650 for 1 year now and it hasnít ever run properly and I am out of ideas. I welcome any suggestions you can offer. The bike starts properly when the choke is open full and the revs are high, as soon as I start to close off the choke the bike runs rough then starts to pop as if there is a build up of fuel, the pops become closer together then it stalls.
So far I have swapped the coil, carb, CDI, it has had a new camshaft and rocker arms, tested wiring loom for continuity, bypassed ignition, swapped stator. I have not been using the tank, I have been supplying fuel from a funnel and hose so itís not a fuel supply problem, new plugs, air filter, HT lead, new battery.
Any ideas, so far I have an expensive paperweight!!