Actually got round to playing bikes this weekend.
Got a 400/4 about a year ago. Would not start - nasty gummed up carbs. Stripped them and part way thorough cleaning them with ultra sonic cleaner etc. (did this when I first got the bike but not touched it since)
Anyway picked up another bike the other week, again a non runner but nice bits to cannibalise. Thought I would try carbs on existing bike. Didn't want to get into full strip of them, just see if the bike ran. So I have serviced them from float bowl end only. Cleaned everything up and blew through all orifices / jets. Although I have a full service kit I replaced main jets only for now as I just want to see how bike runs before strip down. Cleaned emulsion tubes and set float heights.
Good spark, timing seems fine but will only fire occasionally on the odd pot when trying to start it. Had it running for a couple of seconds with easy start too. PLUGS ARE DRY!
Fuel in float bowls, no leaks all looks fine really.
The only jets I didn't clean were the air screws. On removing the 2 in situ on the outside carbs, these they are covered in a wet reddy brown mess, not clean fuel. No more time today but before I take carbs off again to look at this, would a blockage here stop it starting with symptoms I describe?
Over to you experts! Any help appreciated.
Tim