A little, probably not enough to notice though.

I thought the hi tap only affected the high-voltage coils (flippers/pops/slings/kickers), and not the logic or score solenoids. Am I wrong? (Really not sure so I thought i'd post this.)

What game are we talking about? On my Williams EM the transformer has 24V/high tap output and 6V for lights. Everything other than lights runs on 24V (or high tap).

What is the issue you are trying to resolve?

Not certain, but I believe the driving AC force for motor speed which is pulsing the reel coils is the 60Hz frequency...high tap is giving you more voltage, but at same frequency.

All 24V circuits are effected, including score reels. But it's only a few volts difference.

No, just a boost to flippers-pops-etc. Be careful...plastics can break 'easier'. Not a fan of hi-tap. My belief is if game is all dialed in it should be fine and operate the way it was designed. I look at it like 'hot-rodding' a pin. : ) All depends on what you like and how the game plays.

It won't fix your problem. As noted, it provides more volts, but it won't turn the score motor any quicker. I still think your problem has something to do with the switches. Something is letting the ball go through the rollover lane way too fast. I have RB and unless the ball just jets through the lane, which is rare, I don't have this problem.

60Hz is 60Hz. You can't change this. 60 cycles per second. This is the frequency of the oscillations of the power grid on alternating current, and has nothing to do with the game.

Hell, I don't even know if I'm even close suggesting frequency being a factor....I did sleep at a Inn Express a few years ago though.. .But I would think no, you can't adjust the frequency or voltage to increase speed of the motor with it having been set/designed for the US 120/60 with the windings, pole, gears, etc. it has.

Maybe cleaning gears and fresh drop of oil in the pad underneath could help speed it up. Also what your seeing could just be normal...maybe someone else with this pin will chime in. I know on my games it irks me when say I hit two drop targets at the same time, but only get score for one. Game logic just not there yet...wait for the great digital era.....

Agree with that seeing how EMKC works fine unless ball shoots thru...weird for sure. Maybe what EMKC looking for pictures of the the rollover....tension on the blades underneath adjusted so tension on rollover is increased which would slow the ball down?

Tearing into the motor like that is not a job for someone who is not very experienced fixing games. You're more likely to cause more problems.

I always lube the gears. With some old automotive grease that you can no longer get.

Yes, super lube it, no problem..
What I would like to see, is a picture of before and after Hi-Tapping
on the power supply...., thanks.

See if you can bend the lane guides in a bit to slow the ball down just a touch. They're just plastic with two pins that go into the playfield. But be careful with that.

If you trip by hand does the 50 point part of the scoring go as fast as say the center target or joker targets?

Throwing this out there.
Not sure if this is it but a slim chance it could be.
You do know that timing is adjustable by how you position the score motor stacks,maybe the stack involved is not in the right position? Moving a stack fore and aft can effect timing along with accidentally swapping stacks on the Scr motor and not being in the original positions.
Like they say timing is everything.

River Boat uses a platter style motor, like Gottlieb used, and not the reel type later used by Williams.

I don't think the switches are adjustable on that motor. You can move them around some on the reel type motors, but this one is pretty fixed, I believe.

In any case, a switch in the wrong position on the score motor would affect all the 50 point scoring, which it appears this doesn't.

It is covered on another thread but I found using a mini tube cutter provided clean & excellent separation of a coil sleeve to shorten it.

ebay.com link: Mini Tubing Cutter Copper Pipe Cutting 1 8 5 8 OD Rigid Plumbing HVAC NEW

I have a different opinion about lubing score motor gears. Lubrication of any kind attracts dirt. We know that dirt in moving parts cause wear and dust/dirt always accumulates in the bottom of our cabinets.

Game manufacturers never lubed the gears in an open gearbox and I suspect its for a reason.

I always clean greasy gears with solvent and an old toothbrush to leave them dry as the designers intended. I make sure the pads in the oil holes are plenty damp with light oil as recommended but that's all.

To me, the greasy gears in the previous open geabox photos look like real potential trouble.

I was thinking you might have had more of an issue with the reel mech than the score motor. Glad you figured it out!

No grease eh? I would think dry gears might have a tendency to wear or strip. But if they didn't use any, then they knew best.

For motor gears: Metal on Metal, I would always use grease to prevent wear. Every enclosed gear box I have ever opened was well coated at one time with grease. First gear is sometimes Phenolic to reduce noise and requires grease so that the next metal gear doesn't eat it away.

Nylon on Nylon, I could see not using any grease. But would still use light oil on the shafts and any bearings.