Joined: Jul 2015
Posts: 7,413
Likes: 3,250
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
twist grips... freewheel... low end bike...
the crank/chain rings are riveted together, right? they are low end parts, and may not shift easily, no matter what you try.
watch a youtube video on front derailleur adjustment... do what it says to do.... alignment, adjusting the clearance between the der. cage and large chain ring... adjust cable correctly, then set the limit screws correctly.
OR... buy a newer, better crank set if the adjustments don't help. Modern designs use a system of ramps and pins to LIFT the chain onto the larger sprocket when you shift...