CB250RS Parts Transplant – Sprockets, Chain, Side Panels, Mudguard And A Fuel Line

This week, I started with removing the rear wheel from the donor bike and salvaging the sprocket from it.

The sprocket and the wheel it came from…


And the sprocket after cleaning up with degreaser.

Next was the rear wheel from the “recipient” bike


This sprocket looked a lot worse for wear.


Almost like a saw blade compared to the donor one!

One of the bolts from this wheel had a 13 mm nut on it. I cleaned all 12 mounting bolts and nuts up with some degreaser and picked the best-looking ones

While the wheel isn’t in the best shape, I figured I can put a new tyre and new sprocket on it ready for when the bike needs a new chain. I put the better sprocket on the wheel as it had the better tyre before taking a short break for lunch.

After lunch, I compared my three front sprockets. I opted to use the right-most one as it had the least wear.

I cleaned up the primary drive shaft before fitting the sprocket.

The sprocket and the locking plate in place, fixed in place with the mounting bolts.

I opted to re-use the spare chain for now, after a liberal coating of “rust buster” spray.

Adjusted the chain tension, tightened the axle nut and fitted a split pin.

I popped the side panels in place and re-fitted the front mudguard.


I removed the front brake caliper from the “donor” bike and placed it in my bench vice to have another crack at loosening the stiff screw on the rear cover.

It chose not to cooperate, so I brought in the heavies – a small sledgehammer and traditional impact driver of the style from the days before they were all motorised. The recalcitrant screw soon saw the error of its ways!

Getting back to the chain, I realised the rear chain guard was a bit warped, so I retrieved the one from the “donor” bike and gave it a once-over with Inox.

Fitted and looking good!

The lower front chain guard was next. I fitted the plastic one too but I must have been getting tired by this stage, as I seem to have forgotten to take a photo of that step!

The helmet holder that matches the ignition, fuel and steering locks went on next, but was only fitted loosely as I’ll probably switch all the locks with Scarlet’s later.

Finally, I cut a fresh length of fuel hose to replace the piece that had been broken off prior to the parts transplant.

I haven’t started the bike again yet, I’m saving that for next week!


Nix’ Noticeably Nicer Nature, Securing and Sprucing Up Scarlet

On Friday lunchtime, I visited the local bike wreckers again and left with a set of replacement mirrors, a spare left indicator and a seat in a reasonable state of repair.

I fitted the seat and right mirror immediately and noticed a considerable improvement in how she rode. If she has a personality, it seems to have improved dramatically since she has been registered and got some attention.

On Saturday I removed her damaged and mismatched right fairing.

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the damage wasn’t that major,so I’ll give it the same repair treatment I gave the other fairing panels when I have time.

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The replacement right mirror mount needs a good clean to remove the writing the wrecker left on it and possibly a bit of a touch-up on the paint.

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The mirror itself is fine, although also in need of a good clean.

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The left mirror mount is in much better condition than the old one.

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The mirror housing is a bit more scratched, so I may end up putting the original one back on.

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Although it looks repaired, the original right mid-fairing is definitely in better condition than the matte black one!

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While it has a few small tears in the pillion section, the replacement seat is also a definite improvement! I’ll probably re-use the strap from the original one once I can get the screws out that are holding it on. I broke one screwdriver bit attempting to remove it before I realised the threads on the screws holding it on seem to have been deliberately crushed at a certain point – possibly at the factory to prevent them from unscrewing from vibration.

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All up, she seems to look a bit happier.

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The left indicator is still yet to be replaced, I ran out of weekend so it can wait!

In between removing Nix’ right mid-fairing and waiting for the J-B Weld to set on the original, I worked on Scarlet.

First I fitted her new battery and swapped the right side of the toolbox with the one I bought for Eric, as this one has a lid.

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While it’s authentic for Scarlet’s year of manufacture I’ll probably replace it with Bruiser’s eventually, as that one can be latched and opened with a motorcycle key or screwdriver.

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Despite the mounting bolts being round and devoid of screwdriver slots, I managed to remove the broken helmet holder lock from Scarlet and replace it with the one from Bruiser. This meant that both of the locks fitted to her now unlock with the same key I use for her ignition switch.

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I had been bothered by the amount of rust on her handlebars for a while, as well as the mismatched handgrips after replacing the throttle assembly.

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I swapped them with Eric’s but forgot to get a photo during daylight, so took one tonight instead.

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Since all three of the locks fitted on Scarlet now matched, I decided to try my luck with fitting Bruiser’s steering lock, as Scarlet didn’t have one at all when I got her. After quite a bit of WD40 and cleaning out of the lock mechanism with fine wire, I discovered that Bruiser’s steering lock didn’t have a broken piece of key in it after all, just a lot of dirt and grit. I managed to clean the mechanism up enough so that it worked with after applying a little “elbow grease” to the key.

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Since this will be the final lock unless I replace the seat cowl, I tested it after fitting.
Left is locked, right is unlocked again.

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All up, not a bad weekend’s work – Nix and Scarlet now only have one major and one minor issue each.

Nix still appears to be slowly leaking either fuel or oil (relatively minor) and the rear shock needs adjusting or replacing (fairly major in terms of comfort).

Scarlet’s right front indicator still doesn’t work (relatively minor) and she’s still running too rich to idle without stalling (fairly major).

I went to ALDI this evening and found a special on Brasso and Silvo, so I grabbed a bottle of each. Once I get the problems above sorted, I’ll get onto de-rusting and polishing any bare metal or chrome I can find!

Eric, A Parcel From Japan And Bruiser

I picked up my parcel of parts for Eric from Japan this morning before work.This evening near the end of my work day, I got a call from the transport company about the blue CB250 RS from Adelaide asking it could be delivered tonight. Of course I said yes, I’d be home tonight!

First up, the contents of the parcel, plus the battery I still haven’t installed!

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So of course I had to install something from the box of parts before the other bike arrived. I decided to install the indicator relay.

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The rubber loop on the right is where it should be. Plugged in the wires as they were nicely colour-coded on the relay.

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I put it back in its place but forgot to get a photo of that, as I noticed the rear brake light switch wasn’t connected and decided to fix that.

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Next I attached the fuel tank strap.

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This one has a key that works!

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Next up I started on replacing the steering lock, as this came as part of a matching set of locks with the tank strap and  the helmet holder.

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The face-plate had to come off to get to the screws for the lock.

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I put it on the seat for safe-keeping and was just about to tackle the screws for the previous steering lock now that they were accessible.

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The transport guy had arrived with the blue bike!

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After thanking the driver before he left and giving the bike a once-over, I settled on the name Bruiser, as this bike is blue, black, brown and beaten-up-looking!

By this time it was fairly late in the evening, so it’s off to bed so I can get up early and go pick up a red one tomorrow morning…