CB750 Barn find project - First Timer

[K2-K6]

You could try acetone (carb or brake cleaner) to dissolve the varnish sample.

Or from a plumber's supply,  the thinners they use on polypipe to clean it or thin the adhesive to see if either will have an impact.

[Underdog1]

You could try acetone (carb or brake cleaner) to dissolve the varnish sample.

Or from a plumber's supply,  the thinners they use on polypipe to clean it or thin the adhesive to see if either will have an impact.

i left a chunk of the varnish in brake cleaner for 24hrs and again, had no effect. I suppose if could take longer than that but it didn't even soften

[K2-K6]

The polypipe thinners is different altogether so may be worth checking.

Used to use it alot but can't remember right now what chemical solvent it is.  Definitely not acetone though so could give a result.

[Bryanj]

If you look on the US site they seem to like Muratic acid---whatever that is

[SteveD CB500K0]

Where’s Ash when we need him?


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[Seabeowner]

Where’s Ash when we need him?


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It's a shame he's not active, certainly missing him. Hope he's fine.

[sye]

It would seem that Muriatic Acid is hydrochloric acid over here and it's most common use is as a brick cleaner:
https://www.toolstation.com/shop/p29118?r=googleshopping&rr=marin&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=EAIaIQobChMIg6vyl6bG2wIVaLXtCh0FlwSnEAQYASABEgJjEPD_BwE

It can also be obtained rather cheaply from chemical suppliers:
http://darrantchemicals.co.uk/muriatic-acid

[71 V12]

I don’t know where you are in the U.K. but this company cleaned my tank recently. I would say it was worse than yours. Like brand new inside now. They charge about £40 and turn around in 48hours.

Voith Industial Services
Warwick House, Watling Street
Wilnecote
Tamworth Staffordshire B77 5BH
United Kingdom

Just off the M42 jnc 9.

Cheers

Kevin

[Underdog1]

Engine back in, but turns out we’ve got a bit of a houseful today so not got much further.





Seems the powder coater missed taping the thread for the grease nipple on the swing arm. Tried cleaning it out best as I can and screwing it in but I think the grease nipple has started to cross thread



What size thread is it? 6mmx1mm pitch? I’ve got a tap I can run down it but wanted to check first as I don’t want to wreck the thread in the swingarm if I can avoid it - is this a known weak spot?

[Bryanj]

Not normaly weak, that has to be a later swing arm if it only has one nipple underneath

[Underdog1]

Not normaly weak, that has to be a later swing arm if it only has one nipple underneath

Yeah it is, basically what’s the best way to get paint out the thread?

[Underdog1]

Well.. I ended up getting the grease nipple threaded in, huzzah! Can get the rear end all bolted up...
Maybe not. After I installed the swingarm I was moving the swingarm down to get the shocks bolted up and I managed to snap the grease nipple off against the engine casing somehow..






Really annoying. Might be because i had the grease nipple pointing forward towards he front of the bike, must be a really tight clearance thought.

On another not in having an issue getting my front wheel bearing retainer in, it’s a pattern part and it seems the threads are ‘tighter’ than the oem one I’ve got (which is mangled) a anyone else noticed this?

[Underdog1]

Rear wheel laced up


And this is as far as I can get the front bearing retainer in, even tried hitting it with the impact driver 

[MCTID]

Mine was just the same......it was an absolute pig to get it out.....you should have seen the 'Heath Robinson' affair I rigged up on my Workmate to remove the rear Bearing Retainer (I'd stripped the rim off it - so it was just the hub).

I bought new Bearing Retainers but they also proved tight to insert so I asked my local Machine Shop to 'ease' out the threads in the Hubs......which worked a treat......well worth £20 for both Hubs.

The way I looked at it was that I wouldn't like the next person who stripped a Bearing out to go through what I had to.

[Underdog1]

Mine was just the same......it was an absolute pig to get it out.....you should have seen the 'Heath Robinson' affair I rigged up on my Workmate to remove the rear Bearing Retainer (I'd stripped the rim off it - so it was just the hub).

I bought new Bearing Retainers but they also proved tight to insert so I asked my local Machine Shop to 'ease' out the threads in the Hubs......which worked a treat......well worth £20 for both Hubs.

The way I looked at it was that I wouldn't like the next person who stripped a Bearing out to go through what I had to.

Might go down this route, was it the hub the machines the threads in or the bearing retainer? Might hold tight on lacing the front wheel up. Seems a bit of a joke to have these things staked in, on what planet are these things backing out?

Once all the bearing retainers are in I was thinking of putting a glob of locktite down each stake hole rather than restaking - any issues with this?


On a more positive note I got the snapped grease nipple out the swingarm



The first time in history an easyout has worked