Hi all,
I've managed to get my 400 up and running after much work on the body, repainting etc.
Today was a mixed bag. I just couldn't get the bike to start and idle. It would start very briefly with full choke and some throttle, then it would die. It turns out you need a fair old whack of fuel in the tank to fill the floats, and they just weren't filling up.
Once I got the fuel situation sorted, I managed to get it to start and idle with full choke (very smokey), then if I turn the choke off, it shoots up the RPM (without any throttle input) at which point I hit the kill switch. The idle screw is all the way out, and I don't -think- there are any obvious air leaks, because I tested with some squirts of carb cleaner around the place. What I suspect is that the slides are too high, and are letting in too much air at idle. If I understand it, it's probably best to use the balancing screws to have the carbs quite low (but equal), then use the idle screw to lift them if it idles too low?
Once it got a little late to be rev bombing the neighbourhood, I turned my attention to a spare set of carbs I have. While dismantling, I may have used a tiny little bit too much force trying to get the main jet out.
I managed to create a couple of hairline cracks in the carrier for the main jet. They don't go down too far, maybe 2-3mm. Is this likely to cause any issues?