SOHC.co.uk Forums > CB750

Which brakes? ...and headlight brackets

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kifer:
Hey Robbo don't get stressed walk away things will be easier another day [ thats what I do. ]
I put grease gun direct into caliper pipe union using a compressor fitting, sometimes helps if you push piston in a couple of mm first don't know if anybody else does this but seems to work for me.
Carbs/ seems funny all cylinders are dry ?
Good luck with house move PROPER STRESSSSS!

Robbo:
Thanks mate, sound advice!

On the plus side I have managed to make my seatbase at work and it's looking pretty tasty. I'm gunna cover it in raw leather so it gets darker with time, not quite sure how I'll do it yet but I'll put my head to it once I'm all moved.

I've got to use my workshop as storage for a few weeks so I'll attack it with a fresh head then. I didn't check the cylinders but I could only get the bike to start by spraying carb cleaner on the filters, even then it would only got for a second. It runs with a petrol soaked rag across the filters too for a bit. It's funny as the main jets seem fine as do all the float needles. I must be missing something...

Robbo:
I manage to get the pistons out! I took the m/c off the bar and just used about 7" of brake line attached directly to each cylinder and after much pumping it came off.

Quick question though: On other bikes I have had when you pump the level it takes more fluid from the reservoir, this seemed to get it back from the hose (almost as if a one-way valve somewhere wasn't working properly) It seemed like an awful lot of pumping for not much movement at the piston (If I had a Mrs she'd say the same... ;))

Any Ideas?

Bike is starting to take shape, I have sanded my 400/4 tank back to bare metal and cleaned up or stripped off most of the paintwork elsewhere. Got a set of headlamp brackets, original Honda no less, and a John Tickle pair too - when I get a lamp I'll decide which look best. Seat is just waiting for foam and leather.

Still not had it running without a petrol-soaked rag even though I have cleaned, checked and balanced the carbs(by eye) many times - it just won't start yet. More investigation needed this weekend.

hairygit:
If you didn't bleed the system after changing the hose set up, that would explain the time it took to pump the pistons out, as you were effectively compressing the air in the system, and that is what forced the pistons out, and that is why the fluid was returning to the master cylinder ;D

Robbo:
I did bleed the system, didn't take long as I could hold the calliper above the mc and there was only about 6" of hose. Once the calipers are back on the bike I'll have a good go at bleeding them an setting them up

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