Dasa 1100 spark plugs

That was my thought aswell so I started to blow through it both with tank cap on and off and it's solid. It doesn't let anything in or out. I've investigated it pretty closely. That's a dead end. Capped. No other vents either.

That little red valve should let air Into tank but block air from escaping
 
Gonna try and blow some with the airgun under the hood of the cap . Tried manually but it might not be enough. I hope it's not from aliexpress.... Found some looking like it
 
Well I be dam.....that little bugger was toast. Looked like it had erroded internally however that could happen.. (China junk?)
Didn't let anything into the tank or out. Totally stuck.
Had a hot products in reserve. Doesn't look as good but will most likely work :)
Gonna take it out for a spin on Saturday and hopefully that was the sole issue.
 
Hi guys just wanted to say thanks for the help. Running fine now with a new check valve and even better with gapped plugs.
Ran 3 tanks of fuel through it... Got some angry neighbour's 60+ as usual screeming it sounded like a cross track so that's a good sign :)
 
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