Can You Check A Plug Chop :-)

We fitted an after market exhaust to my friends Sym Jet 4 125 as his standard one split open.

The bike seems to run fine but we still done a couple of plug chops. I am not 100% sure if we need to swap the main jet or adjust the needle, what do you guys recon ??







Thanks for looking .

 

Would you think going up 1 or 2 on the main jet then ?

 

You'll know if the main jet is too big as it will cough, fart, cut out when on full throttle!