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CB250RS winter project help [message #287166] Thu, 15 January 2015 20:25 Go to next message
jpurdy09 is currently offline  jpurdy09   United Kingdom
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(1) Club Racer
Hi all, I'm new to this whole forum stuff, but I need some help..... My winter project cb250rs is nearly stripped down now, but I've got stuck when it comes to removing the swing arm, the pin is totally seized and will not budge.

Any ideas on how I could get it removed, I will be replacing the pin so damage is not an issue.lol I hav already tried a large bar for great leverage and tried brute force with a hammer from the other side. Lol

Any help is appreciated.......
Re: CB250RS winter project help [message #287169 is a reply to message #287166] Thu, 15 January 2015 21:19 Go to previous messageGo to next message
Quazi is currently offline  Quazi   United Kingdom
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(22) Giacomo Agostini
Welcome fella,

Are we talking an early 80's RS?

Very problematic when these pivot bolts seize in place on any bike. Have you been able to unbolt it, or is it totally stuck?

I removed a seized bolt from an early suzuki frame by using a hacksaw down beside the swingarm and between the frame, yes it took fooking ages to cut through both sides, but it just wouldn't move by conventional methods, such as bigger hammers, heat etc.

Once cut it gave me more room to knock it out after a good soak in wd40 and applied heat.

If you have access to an air hammer you could use a flat chisel end and keep knocking it from one side.

There;s no easy solution, patience and copious amounts of wd or similar, with applied heat and knocking it out.

Good luck, it's a common problem.

[Updated on: Thu, 15 January 2015 21:19]

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Re: CB250RS winter project help [message #287170 is a reply to message #287166] Thu, 15 January 2015 22:23 Go to previous messageGo to next message
Kakugo is currently offline  Kakugo   Italy
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(18) Geoff Duke
Highly problematic indeed. think

Only thing I can think of right now is to alternate heating and cooling cycles (meaning an heat gun quickly followed by ice cubes in ziplock bags held in place with tape) with a few blows from a rubber mallet in between.

Lubricants can help, but not WD40. In my experience with seized bolts, pins etc it's worse than useless. Not thin enough to get were it's supposed to. Get a good penetrating oil, like CRC Freeze-Off. If you cannot find any, a 1/1 solution of automatic transmission fluid and acetone will do just fine.
Re: CB250RS winter project help [message #287173 is a reply to message #287170] Fri, 16 January 2015 08:45 Go to previous messageGo to next message
jpurdy09 is currently offline  jpurdy09   United Kingdom
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(1) Club Racer
Hi Guys. Yes its a 1980 bike, been in storage now for around 10years and never looked at... as expected everything was a nightmare to remove. I would nopt be taking the swingarm out, but the frame needs some welding just infront of the pivot so it just has to be removed. I got the nut off one side but the pin is stuck solid in the swingarm.

will try tomorrow heat and cooling along with a bigger hammer.... if all else fails the hacksaw may be brought out....hahaha

Thanks for the advice.
Re: CB250RS winter project help [message #287199 is a reply to message #287173] Sat, 17 January 2015 15:20 Go to previous messageGo to next message
DrMartin is currently offline  DrMartin   United Kingdom
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(18) Geoff Duke
With the nut removed is there enough of the pin exposed for you to be able to grind a couple of flats on it such that you could apply some twisting / turning motion to the pin with a ****ing big spanner inside some tubing in order to help free it up a bit? - with the aid of some decent penetrating oil soaked in overnight before hand? I've always used Plus Gas on old cars and it has worked a treat for me.
Re: CB250RS winter project help [message #287200 is a reply to message #287199] Sat, 17 January 2015 16:49 Go to previous messageGo to next message
Yorkie is currently offline  Yorkie   United Kingdom
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(8) Moto2 GP Racer
DrMartin wrote on Sat, 17 January 2015 15:20
With the nut removed is there enough of the pin exposed for you to be able to grind a couple of flats on it such that you could apply some twisting / turning motion to the pin with a ****ing big spanner inside some tubing in order to help free it up a bit? - with the aid of some decent penetrating oil soaked in overnight before hand? I've always used Plus Gas on old cars and it has worked a treat for me.



+1 for Plus Gas
Though it's donkeys years since I've seen any.

Re: CB250RS winter project help [message #287203 is a reply to message #287200] Sat, 17 January 2015 19:38 Go to previous messageGo to next message
DrMartin is currently offline  DrMartin   United Kingdom
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(18) Geoff Duke
Yorkie wrote on Sat, 17 January 2015 16:49
DrMartin wrote on Sat, 17 January 2015 15:20
With the nut removed is there enough of the pin exposed for you to be able to grind a couple of flats on it such that you could apply some twisting / turning motion to the pin with a ****ing big spanner inside some tubing in order to help free it up a bit? - with the aid of some decent penetrating oil soaked in overnight before hand? I've always used Plus Gas on old cars and it has worked a treat for me.



+1 for Plus Gas
Though it's donkeys years since I've seen any.




http://www.amazon.co.uk/English-Abrasives-802-10-Plusgas-Aer osol/dp/B0001P02RK

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Re: CB250RS winter project help [message #287205 is a reply to message #287203] Sun, 18 January 2015 09:18 Go to previous messageGo to next message
Yorkie is currently offline  Yorkie   United Kingdom
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There you go, it was never in an aerosol can when I used it.
In fact I don't think aerosol cans had been invented then Grin
Re: CB250RS winter project help [message #287206 is a reply to message #287205] Sun, 18 January 2015 18:04 Go to previous messageGo to next message
Quazi is currently offline  Quazi   United Kingdom
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(22) Giacomo Agostini
Did you know Diesel is a really good penetrating oil. smile
Re: CB250RS winter project help [message #287211 is a reply to message #287206] Sun, 18 January 2015 22:50 Go to previous messageGo to next message
DrMartin is currently offline  DrMartin   United Kingdom
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(18) Geoff Duke
Quazi wrote on Sun, 18 January 2015 18:04
Did you know Diesel is a really good penetrating oil. smile


Nope, didn't know that. Makes sense though.

Re: CB250RS winter project help [message #287216 is a reply to message #287211] Sun, 18 January 2015 23:48 Go to previous messageGo to next message
Kermit is currently offline  Kermit   United Kingdom
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(22) Giacomo Agostini
good suggestions above. All I'll add is when it comes to bashing the end of the threaded end of a pivot bolt (or any large bolt) which I'm assuming is what we're talking about. Then put its nut back on the end and wind it on till its about flush with the end of the bolt but still a gap between nuts surface and frame as your less likely to damage the thread when hammer/malleting it and this also gives more surface area to whack Laugh

^^ above assumes once it moves a few mm, you can unscrew the nut and get the rest of it out with less brutality.

[Updated on: Sun, 18 January 2015 23:50]

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Re: CB250RS winter project help [message #287243 is a reply to message #287211] Tue, 20 January 2015 17:16 Go to previous messageGo to next message
Quazi is currently offline  Quazi   United Kingdom
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(22) Giacomo Agostini
DrMartin wrote on Sun, 18 January 2015 22:50
Quazi wrote on Sun, 18 January 2015 18:04
Did you know Diesel is a really good penetrating oil. smile


Nope, didn't know that. Makes sense though.



Not for sexual penetration you know though Doc? Laugh

Itches like fook. Wink
Re: CB250RS winter project help [message #287410 is a reply to message #287243] Mon, 26 January 2015 19:08 Go to previous messageGo to next message
RWB929 is currently offline  RWB929   United Kingdom
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Had the same issue with a DRZ400 swingarm, plenty of plus gas, heat to swingarm, then laid the bike on its side and while the wife held a metal drift with a pair of mole grips I belted the granny out of it with a 14lb sledge hammer.
and I'm not exaggerating when I say it took best part of 8 hours of hitting it before it came loose..

Drift (old Socket set extension bar) and swingarm bolt..As you can see by the bent / flattened ends of the extension bar, it took some force to move the bolt.

http://img.photobucket.com/albums/v638/RWB929RRY/Motorbike%20pics/37CC886D-E242-4075-94E3-1B1E7F05EDF5_zpstreltab9.jpg

[Updated on: Mon, 26 January 2015 19:18]

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Re: CB250RS winter project help [message #287482 is a reply to message #287410] Tue, 27 January 2015 21:48 Go to previous messageGo to next message
slaz is currently offline  slaz   United Kingdom
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(21) Valentino Rossi
Not to sure if this is bollox but i had
bolt seized in a brake caliper once and
took it to an engine exchange garage for
advice,and they told me to drop the bugga
in a bucket of Coke a Cola,never tried it
so i dont know,anyone else heard the like think
Re: CB250RS winter project help [message #287495 is a reply to message #287482] Wed, 28 January 2015 09:20 Go to previous message
Gearbox is currently offline  Gearbox   United Kingdom
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(15) Kenny Roberts
Coke does work to a degree, but possibly not on something like that (believe it is the phosphoric acid). Back to penetration Blush

Diesel or brake fluid work well. Heat cycles as well. Don't know the layout of the swinging arm bolt, but assume it it just that. Good impact socket and gun on the bolt head to try to turn the bolt and free it up.

Apart from that patience with a liberal dose of swearing usually works.
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