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Start of refurb

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david451:
Bought two usa cbs, 750, 74 and 77 models they have the oil tanks with the cap on the outside.

What's the best way to get the engine out, lift it out or lift the frame off the engine on it's side.

The chain drive was a bit noisy so took off the chain and had a look at the front sprocket, it seems to be a bit loose on the shaft, it needs a new chain and sprocket set so perhaps the wear is in the sprocket?

Is it acceptable to spray and lacquer the frames or does it have to be powder coating, don't know much about these things in my day the frames got painted.

Anybody give me some ball park figures for chroming, say a wheel perhaps and perhaps my exhausts once I repair them, they seem to be about 1k to replace so that's most of my budget out the window, so it is going to have to be a repair.

Do I need to restore the painted areas on the engine or can I polish all the engine up, and if it's going to have to be painted again, that grey primer colour is there a special paint you get to prevent it flaking off with the heat or can I use normal paint with heat resistant lacquer.

Spitfire:
Hi there, and welcome, if you are going for a rebuild I would definately recommend taking lots of photos during the process, and storing parts in labelled ziploc bags. When you come to put it all back together it can be a pain trying to remember cable and tubing runs and a lot of the detail stuff.
For engine removal I took everything that I could off the bike and was left with a frame and an engine, the engine drops out of the frame side, though it would be easier to lay it on it's side and lift the frame off. I've not removed an engine that way only replaced one in it's nice shiny powdercoated frame.
I powered coated my frame as the powder coating process produces a tough long lasting finish, it's not as shiny or smooth as paint, so you pays your money and you takes your chances.
The front engine sprocket is a loose fit on the shaft due to the way it is retained.
Most chromers will not touch old exhausts as they mess up their bath, so rechroming is not usually an option.
For engine paint I used VHT aluminium paint, a lot of engines are bare aluminium but I would not recommend it on a UK bike, use the "search" funtion on the site to look at types of paint. There's a lot of info here.

Hope this helps

Cheers

Den

david451:

--- Quote from: Spitfire on July 04, 2011, 09:31:27 AM ---Hi there, and welcome, if you are going for a rebuild I would definately recommend taking lots of photos during the process, and storing parts in labelled ziploc bags. When you come to put it all back together it can be a pain trying to remember cable and tubing runs and a lot of the detail stuff.
For engine removal I took everything that I could off the bike and was left with a frame and an engine, the engine drops out of the frame side, though it would be easier to lay it on it's side and lift the frame off. I've not removed an engine that way only replaced one in it's nice shiny powdercoated frame.
I powered coated my frame as the powder coating process produces a tough long lasting finish, it's not as shiny or smooth as paint, so you pays your money and you takes your chances.
The front engine sprocket is a loose fit on the shaft due to the way it is retained.
Most chromers will not touch old exhausts as they mess up their bath, so rechroming is not usually an option.
For engine paint I used VHT aluminium paint, a lot of engines are bare aluminium but I would not recommend it on a UK bike, use the "search" funtion on the site to look at types of paint. There's a lot of info here.

Hope this helps

Cheers

Den


--- End quote ---

The gearbox sounded a bit clattery, at 25k is there problems with them that's why I thought the sprocket was to blame, is there a check I can do. I was running it on the centre stand mind you and just comparing it to the other one which is not so noisy.

mick:
Hi David the clattery sound you describe could be clutch noise which is common on these 750's usually at tickover if your carbs are out of balance they can sound like a bag of spanners  :o usually opening the throttle slightly or pulling in the clutch can quieten things down some, i would imagine by the time you have given it a thorough tune up most of the noises will disappear ;), cheers Mick.

Spitfire:
As Mick says these bikes can sound terminally ill on tick over if not set up right, some sound terrible at tick over even when set up right !

Cheers

Den

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