F100 Yami - A guy's gotta know...

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12-01-2023, 11:58 AM
Slab

2 Attachment(s)

F100 Yami - A guy's gotta know...

If'n you're following along, I bought a broke 100 HP Yamaha cheap. It's a 2000, and supposably the engine is seized. Well, it turns. 1st good news.

So now I wanna do a compression test but the starter motor is shot. A hand cranking compression test shows some compression. YAY, cause if its holding some, then the valves should be OK. 2nd good news.

But now a guy just has to know. What's the compression! A new starter motor has been ordered, but it won't arrive till next week, and I wanna know.

Well, that starter motor just has to come apart now! It turns and engages the flywheel, but no makey going around. The starter clutch ain't clutching. It's fried. Hmmm......now what?

I take her apart, and sure enuf, clutch spins both ways, it's supposed to only go one ways, not both, not good. I jammed a buncha thin slivers of sheet metal into it's bearing, and shoved most of it all backl together, and I can get it to spin and turn the motor, yay 3rd good news.

Attachment 476536

And now I can do the compression test. Hmm, I was too lazy to reinstall the solenoid, so I improvised....

Attachment 476537

A pair of backwards pliers hold the pinion in place just fine.

And before the jammed sheet metal gave up the ghost I was able to get compression off the cylinders. Only got one chance and really not a clean run at them but they all compressed anywhere from 120 to 160. I tried to do the 120 again but No Bueno, starter motor clutch made slipping again. So the 4th good new was we have compression, yay!
12-01-2023, 01:38 PM
Rojo

Slab - Winning one battle after the next!
12-01-2023, 02:21 PM
DockShootinJack

Good news all around. It certainly did not look like that motor had gotten hot enough to lock up
12-01-2023, 02:57 PM
BuckeyeCrappie

Good stuff boss. I envisioned you holing jumpers to pliers etc etc…
12-01-2023, 03:10 PM
kycreek

Enjoy following along. Clean looking motor.
12-01-2023, 03:11 PM
Slab

2 Attachment(s)

Attachment 476551

Got the valve cover off. And lookie:

Attachment 476555

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12-01-2023, 03:15 PM
BuckeyeCrappie

Weld?
12-01-2023, 03:31 PM
Slab

1 Attachment(s)

I thought that was metal shavings and worn off bits. But nope. I get lucky again. I touched it and it did not budge, I spritzed it with brakekleen and it cleaned off. It’s the bottom of the block. Seems to me it was there since the casting.

Attachment 476560

Staying lucky so far. Don’t see any evidence of a seized engine. I’ll prolly take the head off and inspect it more thoroughly anyway. At least I’ll know its condition and it’ll have a new head gasket. Right

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12-01-2023, 03:47 PM
Rojo

It's old enough to leak in the water passage area anyway. We have a 250 in the shop right now, a 2008, the one I posted recently. It was ate up with rust on the inside in the oil pan area. I assume from the water leaking out of the exhaust but not in the oil. Finally made it to the oil pan. All toast. My guy ended up buying a used 2012 250 from someone who upgraded to a 300hp.
12-01-2023, 04:18 PM
Slab

Quote:

Originally Posted by Rojo

It's old enough to leak in the water passage area anyway. We have a 250 in the shop right now, a 2008, the one I posted recently. It was ate up with rust on the inside in the oil pan area. I assume from the water leaking out of the exhaust but not in the oil. Finally made it to the oil pan. All toast. My guy ended up buying a used 2012 250 from someone who upgraded to a 300hp.

FYI, the previous owner showed me his receipt for a head and block replacement on this motor four months before he says it seized on him. So it should be, if not new, newly inspected stuff, and hopefully not rusted. dono for sure, but time sill tell whilst I tear her down. Won't get to tear it down any further till late next week though, life interrupts my projects yet again. doh

PS. The oil pump was replaced at the same time the head and block was. And, when I drained the oil I found no water. still, time will tell
12-01-2023, 04:52 PM
DockShootinJack

Good deal
12-01-2023, 08:20 PM
Rojo

Looking at your pictures I think your receipt is correct. Top or Bottom Crank Bearing may have had a lack of oil causing it to seize, would explain why the previous owner thought it was Toast. If you shoot me the model I may have a complete digital manual for it in my stash. I can email or mail a flash drive if needed. I have a mountain of digital Yamaha manuals. You're going about it right to crack the case and check it completely before making it run.
12-01-2023, 09:01 PM
Slab

Quote:

Originally Posted by Rojo

Looking at your pictures I think your receipt is correct. Top or Bottom Crank Bearing may have had a lack of oil causing it to seize, would explain why the previous owner thought it was Toast. If you shoot me the model I may have a complete digital manual for it in my stash. I can email or mail a flash drive if needed. I have a mountain of digital Yamaha manuals. You're going about it right to crack the case and check it completely before making it run.

F100TLRY year 2000, thanks John. You da man.

Gotta wait for my father in law to come down before I can crack the top off on my sprint bass boat to replace the stringers anyway. So project Yami f100 here we come.

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12-01-2023, 09:19 PM
Rojo

Quote:

Originally Posted by Slab

F100TLRY year 2000, thanks John. You da man.

Gotta wait for my father in law to come down before I can crack the top off on my sprint bass boat to replace the stringers anyway. So project Yami f100 here we come.

Bud I'm into the Raz-a-Rita this evening, been peeling labels off wine bottles with the heat gun and making Mead. Will look it up on the shop computer in the morning if that's OK.

Rojo's Motto; "The Mornin' is for Thinkin' and the Evenin' is for Drinkin'! "
12-02-2023, 06:55 AM
Micanopy

My truck makes this funny noise whenever I accelerate into a right hand curve. Can you fix it ?
12-02-2023, 07:01 AM
Slab

F100 Yami - A guy's gotta know...

Quote:

Originally Posted by Micanopy

My truck makes this funny noise whenever I accelerate into a right hand curve. Can you fix it ?

Buy new tires.

And rojo, I aint ever in a hurry, unless I’m accelerating into a right hand turn!

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12-02-2023, 07:06 AM
BuckeyeCrappie

Quote:

Originally Posted by Micanopy

My truck makes this funny noise whenever I accelerate into a right hand curve. Can you fix it ?

Turn left!
12-02-2023, 07:11 AM
SuperDave336

Works for NASCAR
12-03-2023, 05:22 PM
6poundtest

Quote:

Originally Posted by BuckeyeCrappie

Turn left!

2 wrongs don't make a right but 3 lefts do!
12-03-2023, 05:32 PM
MCG1

So, do you make a checklist or flow chart of everything you do? I'd never be able to remember where I was or where I was going !
12-03-2023, 05:41 PM
Slab

I got a new starter motor and did a real compression test. All cyl over 130 PSI except number two which was 100. Leakdown test tomorrow.

https://youtu.be/Ov1tFkyWX9g
12-03-2023, 06:38 PM
Slab

Don't forget to like and subscribe to my videos to see more of my junk. And so I can reach 1000 subscribers to see what the heck youtube pays! lol
12-03-2023, 09:20 PM
Slab

Quote:

Originally Posted by MCG1

So, do you make a checklist or flow chart of everything you do? I'd never be able to remember where I was or where I was going !

I call it, seat of pants planning. Or pile management. Just like a jigsaw puzzle, where's the fun in actually organizing things. :bash
12-04-2023, 06:23 AM
Slab

Quote:

Originally Posted by Slab

I got a new starter motor and did a real compression test. All cyl over 130 PSI except number two which was 100. Leakdown test tomorrow.

https://youtu.be/Ov1tFkyWX9g

See the lectric fire: Fried - YouTube
12-04-2023, 01:23 PM
slowhand

Quote:

Originally Posted by Micanopy

My truck makes this funny noise whenever I accelerate into a right hand curve. Can you fix it ?

Leave the wife at home.

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12-08-2023, 08:00 AM
Rojo

If its just cold piston seizure I have used Acid to remove the Aluminum deposits in the cylinder liner, re-ring a new piston, re-scratch the cylinder with a flex ball hone and put it back together with great success. If you had piston seizure chances are the Crank bearings are fine too. :twocents
12-08-2023, 12:18 PM
DockShootinJack

Quote:

Originally Posted by Rojo

If its just cold piston seizure I have used Acid to remove the Aluminum deposits in the cylinder liner, re-ring a new piston, re-scratch the cylinder with a flex ball hone and put it back together with great success. If you had piston seizure chances are the Crank bearings are fine too. :twocents

I have seen that done a few times as well
12-08-2023, 01:14 PM
Slab

Quote:

Originally Posted by Rojo

If its just cold piston seizure I have used Acid to remove the Aluminum deposits in the cylinder liner, re-ring a new piston, re-scratch the cylinder with a flex ball hone and put it back together with great success. If you had piston seizure chances are the Crank bearings are fine too. :twocents

I just got back from Blue Springs. Wifey always books a couple days there to see all the Manatee. And this time there were a lot. I'll have a video to share shorty about the trip, it's was a good trip. Anywho, thanks for the info Rojo, I'll be getting back into the motor this weekend. Yeah, I know the head gasket is blown, but it does not account for the seizure the previous owner said that the engine had. So yeah, I think you may be onto something. And hopefully it's exactly that. Cause that too should not be too difficult. We will find out in the next day or two. Keep you finners crossed y'all.