I played a few games and noticed, all my shots were off or just a tad late then where the shot they were supposed to hit.
This usually means a few things to me

There was indeed flipper hop - this seems to mess with shot accuracy to some degree.
I increased the power to the flippers to max, it helped... but not enough. Each flipper has apprx. 1/4 million flips on them.... just seems a little early to be replacing coils, especially when my guardians is close to 400,000 flips per flipper and it's still going strong.

I'm going to order the bigger inlanes guides to help with the flipper hop, and rebuild the assemblies.... something doesn't seem right to me is all. Could be I'm just not used to it... but I don't think that's it.

The question I'm asking is at how many flips do bally/Williams games need to be replaced. I don't think you should go based on the number of games only because game times vary.

well, that's what I'm saying. It seems way to early to be replacing them.

All the other coils in the game are a little pointless to replace, I agree to that point. But flipper coils usually make a HUGE difference.

interesting, never knew nobody else replaced these.
I understand that there are several other parts that are probably more suspect at this point. I've always found that it helps with performance when you do replace them.

go to 1:45 he explains it pretty well.

yeah I'll probably rebuild them tomorrow, and keep the original coils.
wasn't aware of the ramp flap tip, thanks

everything is makeable, just seems like it's flipping a little later then it should ( I find this usually means power is being robbed from somewhere). I do have this issue on a demo man, it's extremely difficult to make that crane shot... pretty sure that's what nature intended though.

it is interesting to me that a majority are against changing out coils though. Nothing wrong with that viewpoint, I'm just gonna have to agree to disagree.

If you were able to keep the operation of the coil friction free then, yes you would probably never have to mess with changing the coil.

older games like EM's can get away with a broader range of power since they are single level. So even if 30-40% of the initial power is gone it won't play a huge roll on how the game flips. It also happens so slow that's it pretty hard to notice, especially in a home environment.

found another thread on it.
https://pinside.com/pinball/forum/topic/why-would-a-coil-weaken-over-time-dumb-question-of-the-day

Think you took what I said to literally, I know the coil itself is friction free. I was talking about the stuff the coil drives. If these components stayed friction free then yes, there would never be a reason to change the coil. One cannot go bad without the other.

All I'm saying is think about what happens when a coils resistance changes lower and lower until it gets to be a dead short.
if more varnish wears off the coils windings that's one-two-three-etc... less windings lowering the resistance, This inevitably changes the inductance of the coil.

I always check my coils with a dmm before replacing them, I don't just do it on a whim. That would be way to expensive.
this time it was a few parts coil sleeves, stops, and plungers, everything else was still really good looking. That was enough for a descent amount of power loss.