Suntour shifters - won't hold change in place

[DCLane]

I've re-fitted all the parts to my painted Tony Doyle Ammaco road bike, which has 7-speed Suntour cassette and is a triple.

The problem? The shifters won't hold the cassette/chain in place on one side and they work in reverse on the triple. The derailleur is now fine, having worked on it today.

I'm guessing I've re-fitted something wrong on the shifters, but I can't for the life of me figure it out

Any help gratefully appreciated before SWMBO makes me get rid of it.

 

[Globalti]

I don't understand your question. What kind of shifters does it have? What exactly is the problem? Is it that the shifter for the front mech can't keep enough tension in the cable to hold the chain on the big ring?

 

[DCLane]

I don't understand your question. What kind of shifters does it have? What exactly is the problem? Is it that the shifter for the front mech can't keep enough tension in the cable to hold the chain on the big ring?

It was basically not holding the tension - I've tightened the downtube shifters and they now hold - didn't want to break them. I've now just got to adjust the cables and that'll be the project finished apart from new bar tape.

It's one of these systems:

And this is the bike:

 

[HovR]

The shifters won't hold the cassette/chain in place on one side...

Sounds like they're friction shifters and you haven't set the friction high enough. Keep on tightening the bolt/screw that holds the shifter on to the frame/boss until the friction is set high enough to hold the shifter in place.

How do you mean they "Work in reverse" on the triple? On all downtube style shifters moving the shifter so that it's pointing towards the back of the bike will shift to a bigger ring, on the front meaning you change to a higher gear whilst on the rear this will mean you change to a lower gear.

 

[DCLane]

I'd set it wrong for the triple - that's now OK too.

Thanks for the suggestions though.

 

[Globalti]

If those Suntour shifters are built anything like the later Suntour bar shifters I love, their only weakness will be that eventually the ratchet wears out and they lose their ability to hold their position no matter how much you tighten the friction adjusters.

BTW that rear valve looks to be under a bit of tension - the tube can tear away from the valve catastrophically if you're unlucky.