ORIGINAL: dick Hanson
strange -I run both the wt76 and the 201 carbs on my zdz50's with pipes -turn 22x8 props over 8400 in the air no lean problems
and no heating problems .why should the DA 50 go lean with these carbs -unless there is a isolated carb problem. ?
the 201 has 3 primary discharges and a high speed outlet the WT76 has one each - but the high end adjustment seems much the same on both - I have run a number of both -and prefer the 201 as it typically is easier priming and has a great low mid speed control .
There is a HD carb also which fits and runs very well -I got one of these from RCI a while back when testing stuff -it has more bore -but fit and ran same power levels etc..
Take into consideration that you've been running gas engines for many years and you've played with all kinds of pipes and carbs. Your a very experienced engine tuner.
Not everyone has the ability to diagnose problems or fix them as well as you. I think it's entirely possible that he may not be getting enough fuel at WOT with the stock carb.