with 'more period' VM29 MM smoothbores, bought from the adverts in here. I rebuilt the smoothbores with over £200 of new parts from Allens Performance (on their advice with all parts that might cause problems), float valve assemblies, needle jets, drain screws, main jets, venturi Blocks, gaskets etc etc.
I started the bike up yesterday and it seemed to run OK (if a bit rough as I'd only statically balanced the carbs, but it idled ok and seemed pretty much fit for a first run). No fuel leaks, just a bit of backfiring which tightening up the inlet rubbers etc and a bit of tweaking of the pilot jets etc seemed to cure. Started and stopped it loads of times yesterday and all seemed OK, this was obviously prior to fully balancing the carbs.
After fully charging the battery last night with an Optimate I went out and tried to start the bike again today and it was like a completely different bike, just wouldn't start, chugging and backfiring like hell, and when it did start it only ran on cylinders one and two, three and four stone cold.
Checked spark (Dyna ignition) and all plugs were sparking OK so not a coil or ignition problem (so I thought).
Checked the fuel, checked tank tap and removed drain plugs and fuel was reaching each carb.
One drain plug had dodgy threads and will now no longer seat tightly so this will need to be replaced, but wasn't leaking previously.
It turns over fine, just wont fire worth a damn.
Have I a shim / valve problem?
I did replace some shims a while back and as said the bike was running fine yesterday after numerous start / stop sessions?
I'm at a loss unless something is preventing the fuel reaching number one and two cylinders.
Help!!!
John
