79 superdream carbs running lean when hot!!!

Well first test run today since carb rebuild and new/replacement petrol tap parts. I set both mixture screws to 2 turns out from closed, ( previous settings r/h carb 1 1/2 turns out, l/h no idea adjuster broken off!!!!). Only needed half choke this time compared to full last time. Engine started first time and idled at about 2000rpm on choke, 5 minutes run then no choke, idling at 1200rpm now, ( slower than before 1500rpm), great pick up and return to idle so I have left the mixture screws as is (2 turns out from closed, slightly rich I think). The main difference was that when I shut the fuel tap on the external fuel supply, you could actually se the level of fuel drop in the tube, I let it run until the tube was totally empty. This was a huge improvement as on previous tests the fuel level would remain the same but the float bowls were almost empty!!!!!!!!. So all I can think of is that there must have been a blockage in the float bowl vents,( small brass tube half way up the carbs.). So this is what I think happened, 1 leek’s in air box rubbers to faulty clamps, 2 not getting enough fuel in float bowls due to a partial vacuum. Engine running a lot cooler and smoother due to slightly richer mixture ( I may adjust later!!). All in all a good result, oh apart from the new petrol tap not fitting, too large. It’s probably a shame but after my first ride out in 36 years was spoilt by a misbehaved sd it’s now been part exchanged for a 2015 Mash Roadstar 400, could this be a big mistake!!!!!!!!!!!!!.
Atb
Peter

I did look at the Enfield meteor as a replacement ( sorry mr Honda ), but it’s quite heavy more than the Superdream lol. Also I like the classic looks of the Mash Five Hundred 400. What really annoys me is the fact that a classic ( 1970/1980s ) Japanese bike is almost twice as expensive as a retro classic 2000 bike!!!!!!!

That could very well be true, but I won’t pass judgment just yet lol

Your new Mash 500/400 looks a real belter congrats on your purchase.. The classic bike prices falling off a cliff recently is a supply and demand issue. Everyday machines like SD's largely appeal to those who had or lusted after them in their youth, as that generation is now starting to drop off the perch the pool of prospective customers is fast diminishing..

Same thing is happening in the car market with everyday run of the mill cars from the sixties and seventies I believe..