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https://www.thobbies.com/products/hpi-109535 did find this, Thobbies is great to deal with, make sure though you are using their .com site, not the .net, the .net is their old one and doesn't put orders through, or show correct stock.

a severe leak from the exhaust manifold can absolutely cause fuel delivery issues, that is where the engine gives pressure to pressurize the fuel tank to deliver fuel to the carb. Z721 looks to be a grub screw, how the starter in these models work is a the little pin with a spring (1433) in the...

+1 to the points above, also make sure to use non-chlorinated brake cleaner. also if your OWB is slipping, you can clean it. hose it out with brake cleaner, then insert an end to a paper towl or rag, and spin the owb both ways, it will leave the debris on the rag that way, then rinse one more...

personally, i have not had any issues with composite carbs, though i have seen my fair share of people who have had issues. if possible can you post a video of it trying to start? and also of when it does start when you put fuel into the glow plug hole? what are the needle settings at? factory...