Seized 2-stroke

FLBandit · 12-24-2010, 04:30 PM

Hey all, I'm about to pull the motor from the RD250 frame and I took the heads off to see what was stopping the motor from turning. Well, the pistons are definitely locked to the cylinders. It looks like it could be just from rust. I'm hoping that if I can remove the pistons and jugs that the bottom end will be salvageable. Anyone have a trick for getting the jugs free? So far I've been soaking it with WD 40 and letting it sit. I'm going to try knocking them loose with some wood and a hammer, but am open for any suggestions.

Dodsfall · 12-24-2010, 10:01 PM

PB Blaster is the best I've found for loosening rusted stuff.

FLBandit · 12-25-2010, 12:35 PM

Cool, I'll have to pick some up.

LWRider · 01-02-2011, 07:18 PM

Strong Arm would be great for that. Miracle sutff, I tell ya. If you find your self in Lake Wales, I'll give you enough to do that.

Cheers,

Mike

VFR800Van · 01-12-2011, 12:30 AM

I would recommend soaking it with pb blaster for a day or two.

OTD · 01-12-2011, 04:15 PM

Yep PB Blaster works wonders.

appalachiantrail2010 · 01-21-2011, 09:47 AM

I second the pb blaster

Dave Bowman · 02-02-2011, 10:50 AM

As strange as this sounds if it is a rust seizure, pour a regular red label coke into each cylinder. There is enough phosphoric acid in the drink to loosen and eliminate rust but not enough to score the piston or cylinder. I have freed up a couple of engines using this method. You may have to let it soak a couple of days but it will free it up. Then GENTLY tap the pistons with a plastic dead blow hammer or a piece of wood. If it wasn't heat seized, this should work. I know I am way late entering this thread but this is good info for anyone facing this problem.

montana.man · 02-10-2011, 10:05 PM

try using diesel fuel it works for me

Johnny225 · 02-11-2011, 11:45 AM

PB BLASTER. or berryman's b12.

jstewart · 02-12-2011, 07:48 PM

I saw a chart of the amount of force it takes to loosen a rusty bolt with different types of products.
wd 40 was the worst followed by pb, liquid wrench was 3rd some expensive brand i never heard of was 2nd and atf mixed with acetone was the best

Nastorrian · 02-12-2011, 08:00 PM

strong arm

stroknsmokngt · 02-12-2011, 08:56 PM

I have used ATF/Acetone mix, works good.

fouillard13 · 02-14-2011, 09:58 PM

atf and wd <40 and lots of patience.

fouillard13 · 02-14-2011, 09:59 PM

lightly tapping the cylinders with a rubber mallet always helped me

12-24-2010, 04:30 PM	#1
FLBandit Senior Member Join Date: Sep 2010 Location: Central FL Posts: 254	Seized 2-stroke Hey all, I'm about to pull the motor from the RD250 frame and I took the heads off to see what was stopping the motor from turning. Well, the pistons are definitely locked to the cylinders. It looks like it could be just from rust. I'm hoping that if I can remove the pistons and jugs that the bottom end will be salvageable. Anyone have a trick for getting the jugs free? So far I've been soaking it with WD 40 and letting it sit. I'm going to try knocking them loose with some wood and a hammer, but am open for any suggestions.

12-24-2010, 10:01 PM	#2
Dodsfall Administrator Join Date: May 2008 Location: Illinois, USA Posts: 16,356	PB Blaster is the best I've found for loosening rusted stuff. __________________ 2008 XL1200R To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

01-02-2011, 07:18 PM	#4
LWRider Challenged Mechanic Join Date: May 2009 Location: Lake Wales, FL Posts: 2,338	Strong Arm would be great for that. Miracle sutff, I tell ya. If you find your self in Lake Wales, I'll give you enough to do that. Cheers, Mike __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

01-12-2011, 04:15 PM	#6
OTD Ole Hamburger Hands Join Date: Feb 2010 Location: Norman OK Posts: 5,010	Yep PB Blaster works wonders. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

02-12-2011, 08:56 PM	#13
stroknsmokngt Master At Arms Join Date: Aug 2010 Location: Roland, Ar Posts: 142	I have used ATF/Acetone mix, works good. __________________ Suz GT750K Hon CB750C Suz GZ250

12-25-2010, 12:35 PM	#3
FLBandit Senior Member Join Date: Sep 2010 Location: Central FL Posts: 254	Cool, I'll have to pick some up.

01-12-2011, 12:30 AM	#5
VFR800Van Verified Join Date: Jan 2011 Posts: 29	I would recommend soaking it with pb blaster for a day or two.

01-21-2011, 09:47 AM	#7
appalachiantrail2010 Newbie Join Date: Jan 2011 Posts: 4	I second the pb blaster

02-02-2011, 10:50 AM	#8
Dave Bowman Verified Join Date: Jan 2011 Location: Middle TN. Franklin area. Posts: 34	As strange as this sounds if it is a rust seizure, pour a regular red label coke into each cylinder. There is enough phosphoric acid in the drink to loosen and eliminate rust but not enough to score the piston or cylinder. I have freed up a couple of engines using this method. You may have to let it soak a couple of days but it will free it up. Then GENTLY tap the pistons with a plastic dead blow hammer or a piece of wood. If it wasn't heat seized, this should work. I know I am way late entering this thread but this is good info for anyone facing this problem.

02-10-2011, 10:05 PM	#9
montana.man Newbie Join Date: Feb 2011 Posts: 6	try using diesel fuel it works for me

02-11-2011, 11:45 AM	#10
Johnny225 Verified Join Date: Feb 2011 Location: fort worth tx Posts: 39	PB BLASTER. or berryman's b12.

02-12-2011, 07:48 PM	#11
jstewart Motorcyclist Join Date: Feb 2011 Posts: 12	I saw a chart of the amount of force it takes to loosen a rusty bolt with different types of products. wd 40 was the worst followed by pb, liquid wrench was 3rd some expensive brand i never heard of was 2nd and atf mixed with acetone was the best

02-12-2011, 08:00 PM	#12
Nastorrian Motorcyclist Join Date: Feb 2011 Posts: 7	strong arm

02-14-2011, 09:58 PM	#14
fouillard13 Motorcyclist Join Date: Feb 2011 Posts: 8	atf and wd <40 and lots of patience.

02-14-2011, 09:59 PM	#15
fouillard13 Motorcyclist Join Date: Feb 2011 Posts: 8	lightly tapping the cylinders with a rubber mallet always helped me

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