Stuck swing arm bolt

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8/13/2018 10:34 AM

1998 yz125 anyone have a trick for getting a seized swing arm bolt out. Its been soaking in pb for a couple days now. Never seen one this bad

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8/13/2018 11:10 AM

Heat is your friend, put a nut on the end of the threads so that when you’re hitting it, you don’t peen the end of the bolt over. Also instead of pb I’ve had good luck with a 50/50 mix of acetone and atf

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RPM Performance
CT
783

8/13/2018 11:27 AM

Try seafoam deep creep. Its a lot better than pb blaster. Next heat the swingarm up to 200 degrees and then blast that bolt out with an impact if a ratchet wont get it.

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8/13/2018 1:08 PM

Ok, im gonna try both of these methods until something works

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8/13/2018 3:02 PM

Kroil Oil. Went through this on a 97 YZ I just got done restoring. Lay Bike on its side and spray that throughout the course of a couple of days. Heat will help too

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8/13/2018 8:05 PM

I've had one stuck rear bad on a YZ250F, all the different liquids & heat did not work this time. I had to sacrifice the pivot bolt and drill into each side of the bolt, using a drill-bit that would reach at least halfway. The reduced wall thickness allowed the bolt to shrink slightly allowing it to come out.

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Melbourne, Australia. Current rides: '11 RMZ450, '84 CR500, '06 DRZ400, '79 KX250 with 400 engine, '06 GSXR1000 full Yosh racebike.

8/14/2018 7:31 AM

Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from harbor frieght would break it free, would that be a bad idea?

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8/14/2018 7:44 AM

bradjaydoe wrote:

Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from ...more

Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. No, a press will not get it.

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8/14/2018 8:39 AM

Press will bend the frame more than likely

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RPM Performance
CT
783

8/14/2018 9:18 AM
Edited Date/Time: 8/14/2018 9:20 AM

Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as well. Heat and a big ass hammer! If you have to beat it much, you can count on a new swingarm bolt.

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Take it to the limit, one more time!

8/14/2018 10:16 AM

Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL.

The pivot bolt sometimes gets rotated on the end with the flats on both sides of the head. The corners on there will dig into the frame and sieze it up. A screw driver and hammer can free it up.

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8/14/2018 11:44 AM

The Nut is off it sounds like? so an Impact will do nothing...... you need to heat the engine case up because I highly doubt it is stuck the bearings which are pressed into the swingarm. I would keep soaking it while laying on it's side so it can run down inside and use heat as the last ditch effort, using heat is great if you are cautious and you understand the damage that could be done by using it.

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8/14/2018 11:47 AM

bradjaydoe wrote:

Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from ...more

kb228 wrote:

Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. ...more

Thanks, is there an impact driver that you would recomend, im sure it would be a good tool too have

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8/14/2018 11:48 AM

murph783 wrote:

Press will bend the frame more than likely

Ok, im not gonna use the press

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8/14/2018 11:48 AM

bradjaydoe wrote:

Should i heat the bolt or just the swingarm area? This is driving me nuts, ive never seen one so bad. I wonder if a press from ...more

kb228 wrote:

Heat the swingarm. Aluminum expands faster than the steel bolt, thus creating room between the two. An impact will get it out. ...more

I will try that than

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8/14/2018 11:49 AM

mx317 wrote:

Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as ...more

I am pretty sure i already need one ......

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8/14/2018 11:51 AM

kb228 wrote:

Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL.

The pivot bolt sometimes gets ...more

Thats interesting because it is some what twisted into the frame!

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8/14/2018 11:52 AM

mx317 wrote:

Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as ...more

Do you think mapp gas is enough or should i use a torch?

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8/14/2018 11:53 AM

526 wrote:

The Nut is off it sounds like? so an Impact will do nothing...... you need to heat the engine case up because I highly doubt ...more

Do you know a safe temperature, or point i should stop?

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8/14/2018 11:54 AM

kb228 wrote:

Im such an idiot. I thought he was talking about the bolts for adjusting the chain. LOL.

The pivot bolt sometimes gets ...more

bradjaydoe wrote:

Thats interesting because it is some what twisted into the frame!

Youll have to use a screwdriver to sortof untwist it. It wont come out until you do. Once its straight you can pound it out.

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8/14/2018 11:59 AM

Had same thing with a used yz125 I bought.Tried everything from heat to soaking in penetrate type fluids. Rang a mechanic freind and he just said flattley you have to bash them out. I ended up literally using a sledge hammer and had to swing fairly hard till it moved the first 50mm or so. Just be careful of miss hits, I put wood blocks around in case. He did suggest that if you grind the head off the opposing side they tend to come out easier backward. I saved my bolt by cutting the last two threads off as they belled but really need to get a new one.

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8/14/2018 12:02 PM

Couldnt find kroil penetrating oil but i got these

Photo

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8/14/2018 12:06 PM

mx317 wrote:

Heat the engine case also. It sticks in the sleeve that runs inside the swingarm bearing, so heat may not get to that area as ...more

bradjaydoe wrote:

Do you think mapp gas is enough or should i use a torch?

Photo


Something like this
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Take it to the limit, one more time!

8/14/2018 12:09 PM

bradjaydoe wrote:

Couldnt find kroil penetrating oil but i got these

Photo

Deep creep is the best around!

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8/15/2018 9:34 AM

bradjaydoe wrote:

Couldnt find kroil penetrating oil but i got these

Photo

kb228 wrote:

Deep creep is the best around!

Ok cool, im just going to keep soaking!

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8/15/2018 9:44 AM

Do you have some pics if your issue? Taking a punch or extension and a dead blow hammer will knock that thing right out. Try an air hammer on a rag maybe

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8/15/2018 12:35 PM

Had the same issue on a yz250. Tried everything and it wouldn’t budge. What worked for me was cooling then rapidly heating. Try packing some ice around the bolt area to cool it off, once the bolt is cold heat up around the engine case area until it’s warm and try beating it out. Might have to do it a couple times but that worked well for me multiple times.

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8/15/2018 1:15 PM
Edited Date/Time: 8/15/2018 1:15 PM

Get an air chisel. Cut the end off of the chisel so you are left with a round end. Use the air chisel with the modified attachment to push out the stuck pivot bolt. I have used this method to easily push out a bolt that would not budge with a sledge hammer.

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8/15/2018 1:17 PM
Edited Date/Time: 8/15/2018 1:18 PM

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8/15/2018 7:37 PM

kb228 wrote:

Do you have some pics if your issue? Taking a punch or extension and a dead blow hammer will knock that thing right out. Try ...more

I will get some pictures tommorrow

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