New motor rebuild seized up

sharky55 · 07-11-2018, 05:33 AM

Used 3.0 oz oil per gallon, to break in motor, ran one mile from home and lost power. When I lifted off accelerator it was making a rattle noise, it went away when I accelerated . Everything is tight motor mounts are tight I am able to turn transmission by hand very tough very upset I spent a lot of money on paying someone to rebuild it . After work I’m going to take the top and off and take a peek inside. Or call the gentleman that Rebuild it let him look at it .

Lochlin · 07-11-2018, 10:15 AM

There is good news in that, if you can turn the clutch by hand then the motor is not seized. Any idea what specifically the rebuild guy did?

Your problem can still be very basic. Are you able to check and see if you lost spark?

raydhd · 07-11-2018, 10:29 AM

I would pull the cylinder off and check side play on the connecting rod. I don't where someone could get parts for that if it was out of spec.Way back the HD engine I used to run sounded like that with the crank/connecting rod bearings were about to fail.

sharky55 · 07-11-2018, 10:46 AM

Ok thanks Guys for the quick reply, I will look more in depth when I get home today. I was supposed to get all new rebuild, i’m assuming that would be all new bearings and seals. The piston had broken when I first taking it to him for a rebuild. It ran great for a week.

raydhd · 07-11-2018, 10:55 AM

If there is too much side to side play in the connecting rod it will just wear pistons and rings out quickly usually resulting in broken rings or worse.

Skoal82 · 07-11-2018, 07:23 PM

Let the person that rebuild it look at it. He may not warranty it if you pop it open

sharky55 · 07-11-2018, 09:19 PM

Yeah I’ll probably wait for him to pop the top

racin161 · 07-11-2018, 11:24 PM

Skoal82

Scooter_Trash · 07-13-2018, 11:20 AM

Quote:

Originally Posted by raydhd

If there is too much side to side play in the connecting rod ...

Per the service manual, the Connecting Rod "End Play Between Crankshaft Throws" should be between .010-.018 in.

raydhd · 07-13-2018, 02:27 PM

Yes that is about the thickness of a matchbook cover if you need a visual. A real easy test is to pull the cylinder and rock the piston side to side at the top of the stroke. If it moves more than a tad you are out of spec. You can run with more clearance but this allows the piston to "wiggle" in the cylinder resulting in higher piston skirt, lands and ring wear.

07-11-2018, 05:33 AM	#1
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	New motor rebuild seized up Used 3.0 oz oil per gallon, to break in motor, ran one mile from home and lost power. When I lifted off accelerator it was making a rattle noise, it went away when I accelerated . Everything is tight motor mounts are tight I am able to turn transmission by hand very tough very upset I spent a lot of money on paying someone to rebuild it . After work I’m going to take the top and off and take a peek inside. Or call the gentleman that Rebuild it let him look at it .

07-11-2018, 10:15 AM	#2
Lochlin Gone Wild Join Date: May 2011 Location: Pittsburgh Posts: 2,946	Re: New motor rebuild seized up There is good news in that, if you can turn the clutch by hand then the motor is not seized. Any idea what specifically the rebuild guy did? Your problem can still be very basic. Are you able to check and see if you lost spark?

07-11-2018, 10:29 AM	#3
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,639	Re: New motor rebuild seized up I would pull the cylinder off and check side play on the connecting rod. I don't where someone could get parts for that if it was out of spec.Way back the HD engine I used to run sounded like that with the crank/connecting rod bearings were about to fail.

07-11-2018, 10:46 AM	#4
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	Re: New motor rebuild seized up Ok thanks Guys for the quick reply, I will look more in depth when I get home today. I was supposed to get all new rebuild, i’m assuming that would be all new bearings and seals. The piston had broken when I first taking it to him for a rebuild. It ran great for a week.

07-11-2018, 10:55 AM	#5
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,639	Re: New motor rebuild seized up If there is too much side to side play in the connecting rod it will just wear pistons and rings out quickly usually resulting in broken rings or worse.

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07-11-2018, 07:23 PM	#6
Skoal82 Gone Wild Join Date: Mar 2015 Location: Central mn Posts: 1,036	Re: New motor rebuild seized up Let the person that rebuild it look at it. He may not warranty it if you pop it open

07-11-2018, 09:19 PM	#7
sharky55 Not Yet Wild Join Date: May 2016 Location: Ohio Posts: 63	Re: New motor rebuild seized up Yeah I’ll probably wait for him to pop the top

07-11-2018, 11:24 PM	#8
racin161 Gone Wild Join Date: Feb 2011 Posts: 1,515	Re: New motor rebuild seized up Skoal82
racin161 Gone Wild Join Date: Feb 2011 Posts: 1,515

07-13-2018, 02:27 PM	#10
raydhd VC 460 CLONE GONE WILD Join Date: Oct 2014 Location: Ray BY The Bay NJ Posts: 10,639	Re: New motor rebuild seized up Yes that is about the thickness of a matchbook cover if you need a visual. A real easy test is to pull the cylinder and rock the piston side to side at the top of the stroke. If it moves more than a tad you are out of spec. You can run with more clearance but this allows the piston to "wiggle" in the cylinder resulting in higher piston skirt, lands and ring wear.

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