Today I open chonda 70 carburetor and found that there are some redish wet dust like deposits on air intake side, also I notice black carbon was also present. I cleaned it but found very annoying. Bike is in good condition mileage, sound etc all ok.
Such stains are common, tight the ring and check if air intake pipe is right placed on carb Red dust inside carburetor is because of patrol & rust chonda has poor quality tanks whichare rusty from factory or gets rust quickly
that red varnish forms due to petrol vapours, normal
I already using inline (Crown CRLF) fuel filter, yes there is a little rust in tank but i don't thinks fuel filter can let the rust pass through. Today i will check the ring and tight it for good sealing.