Plug chop is okay only when filter removed!?!

Guillaume Bergeron /
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I just fired my sachs for the first time this year...

i think it made the same thing last year, but now i need to know why.

My moped is a sachs g-4, everything is STOCK!

my filter is clean, and no big restrictions... except for original ones...

i made a plug chop with filter, and the plug was WET AND BLACK

so i'm telling to myself... must not receive engough air...

for fun, i remove my filter, and do another plug chop...

the color is a sweet light brown, probably a little to light, should be a little bit richer i think.

here's what i checked/did:

-my choke isnt stuck.

-i'm using original jet.

-all the bolts are tight, near the carb and engine

-i cleaned the carb, at least 4 times.

-my airbox is clean

i'm sure someone here can help, it's probably a simple question, but i cant seem to find what's happening.

without the filter, it runs like a dream... but... i dont want to ride it without the filter, and i want it to run well...

anyway, any help will be HIGHLY appreciated

thanks a lot!!!

G.B.

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