Brake Backplate Assembly Honda CB250N 1979

Segmant · Derestricted Danger Joined: 27 Nov 2015 Karma :

Hi

I need to replace the Brake Operating Arm (7) and the Brake cam (5) from the backplate assembly but i cant separate the two, they seem bonded together.

Anybody got any ideas?

Snod Blatter · Crazy Courier Joined: 21 Nov 2014 Karma :

Open up the top of the arm (7) just a little so that the teeth come off the splines - I'd probably use a flatheaded screwdriver. It'll just be corrosion, many of them never get taken off. A spray of penetrating lube or Plusgas or whatever wouldn't go amiss either.

They do separate, promise!
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1994 CB250, 1984 CBX250RS-E, 1989 K100RS, 1995 TRX850, 2016 Z250SL

Vincent · Banned Joined: 16 Oct 2006 Karma :

Aye, two large flat-bladed screwdrivers.....one to open the "split" slightly on top of the arm, and, while that is open, the other to lever it off from underneath. You'll need to use a hammer to get the one 'driver into the split but it only needs to open up a tiny amount to free it so don't go mad.
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Space Is Deep

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

:D sounds like your gunna have loads of "fun" with this bike, take your time, as this little problem is probably the least of your worries!

Does the arm/cam rotate in the back plate or is it solid?

Be careful with heat as the felt seal will burnt and don't mangle the indicator plate.

See the dots?? and notice the blind splines etc.

How's the rear cush drive, cam chain, balance chain and ignition??

Avoid at all costs the need to remove the cylinder head as the 4 centre heads bolts are a real bad can of horrible worms sometimes.

Any oil leaks between the cylinders??
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nuts about bikes

pepperami · Super Spammer Joined: 17 Jan 2010 Karma :

What the others said about the large flat-head screwdriver, however a few squirts of 3-in-1 a couple of hours before you try to separate them might be a good idea Thumbs Up

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I am the sum total of my own existence, what went before makes me who I am now!

Segmant · Derestricted Danger Joined: 27 Nov 2015 Karma :

Heated it up, came out with a whack! seems to have been taken apart before, a few washers missing but now gone to the powder coaters cheers!

Vincent · Banned Joined: 16 Oct 2006 Karma :

Which parts are you having coated?
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Space Is Deep

Segmant · Derestricted Danger Joined: 27 Nov 2015 Karma :

a few things, that backplate and arm, caliper, forks, fenders, wheels handlebar clamp, rocker cover and tank

Actually just sprayed the cylinder block today matt black

Vincent · Banned Joined: 16 Oct 2006 Karma :

Be careful, the powdercoat will add size and may cause problems with fitting. Some powdercoaters are good at masking off parts that need to be kept as is ...others don't bother at all.
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Space Is Deep

Segmant · Derestricted Danger Joined: 27 Nov 2015 Karma :

yeah, the guys i use just do motorcycles. to be honest ive stripped it completely and apart from the stuck back plate assembly the only other things ive discovered is a bolt instead of a stud into the cylinder head, quick fix, and today i found out that the right hand exhaust is a flexible pipe, never seen that before!!

pepperami · Super Spammer Joined: 17 Jan 2010 Karma :

As I am also the proud owner of an old CB 250n , you have now peaked my interest, and that means you must start adding some pictures to this thread.
*It`s the law Evil or Very Mad

*pepperami`s law
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I am the sum total of my own existence, what went before makes me who I am now!

Segmant · Derestricted Danger Joined: 27 Nov 2015 Karma :

https://www.bikechatforums.com/viewtopic.php?t=308678