I don't see the half-link in the pictures (am I wrong?) , so it doesn't look like it's causing the engagement problems... some questions come to mind...
Does the problem occur at the same tooth on the cog? Does it occur at the same link in the chain? Can you push the chain down over the cog or does it not physically fit?
I rode a half-link a while back (different manufacturer) and didn't have these problems.
Is it a 9 speed chain, and a bmx type cog?? if so it (the chain) may be just a tad to narrow for the cog. You may want to try a 7/8sp chain, and see if that helps.
I think so. I would try an 8 speed chain if you have one. Or go buy a cheap bmx chain (1/8 inch) for $8 and give that a shot.
[edit]
should mention that your chain width should probably match the width of the half link. So if it's a 1/8 half link, use a 1/8 chain. If it's a 3/32 half link go for an 7/8 speed chain. At least I think that's how it works.....
[/edit]
I think so. I would try an 8 speed chain if you have one. Or go buy a cheap bmx chain (1/8 inch) for $8 and give that a shot.
[edit]
should mention that your chain width should probably match the width of the half link. So if it's a 1/8 half link, use a 1/8 chain. If it's a 3/32 half link go for an 7/8 speed chain. At least I think that's how it works.....
[/edit]
yup, you got it right. I would not be shocked at all at that except I don't think he'd be able to connect a 3/32" cahin with a 1/8" half link so the link is not the issue for sure. I have to believe that the cog and the chain are different widths, most likely a 9 spd (or 8 spd) chain and a bmx 1/8" cog. that would do it. the only other thing that wasn't mentioned was if there were chainline adjustments made when things were changed out. that could also be the culprit.
The problem seems to be chain (9spd) / cog (BMX 1/8") incompatibility. I got a cog set from Fast Freddy on the way, hopefully that will be the end of my problem.
Is the chain line bang on? Also, using either a new chain / worn cogs or worn chain / new cogs/ring could be the fault. A new chain will not sit down into the cogs toth profile as the old chain/cog wear together. Maybe, a couple of the cogs teeth are "bent or twisted" (hooked) causing the chain jump issue..
"UP the IRONS"!
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