Derailluer problem

[capner2112]

I'm working on a bike that needed new shifters and I've discovered an issue. The rear derailleur is a Sugino VIC high-normal 6sp on a 90's Murray MTB. It shifts fine from high to low but traveling opposite is where the problem is. When I begin up-shifting the RD sticks and does not shift above gear 2. I found the instructions for it online but with no luck. Lubing the pivot points has not helped. I suppose the worst thing would be replacing it.

[Joe_W]

Are the cables (and housing) ok?'Sounds like there's something wrong there (and the spring of the dérailleur might be worn, too, though try the cables first).

[capner2112]

The cables are new with the shifters (Sram grip shifters). It's the original housing which is a larger diameter than the new cable and I lubed those also. The derailleur spring would seem to most likely be the problem. Though there could be a burr somewhere keeping it from moving to those higher gears like normal. If I don't go to the lowest gears (1 and 2) the movement is perfect between those gears.

[capner2112]

I got it to work better today. Not sure how long it's been sitting or it's age but a few other components were sticky.