2 questions regarding exhaust and brake caliper

[horror]

Hi there

   The diaphragm in the front brake resevoir I have had turned to goo whilst the bike sat with no fluid in it. I think the goo has oozed into the master cylinder.
david silver seems to have 1 month waiting list on this part.
I whonder, does anybody know weather it's ok to use a front brake resevoir/lever/master cylinder off any other bike? For example a honda 200 benly.
Cheers

Also, would an exhaust from a cb 500 or 550 fit onto the 400 four? or are the diameters and spacings different?

Cheers thanks

[matthewmosse]

Hi, Not sure on the brake caliper / master cylinder side other than I know that the cylider needs to move a given quantity of fluid so using something off a similar bike could well work with the standard caliper. Personally I'd scan ebay and try breakers for the right part. Exhaust wise the spacing between ports is different, and I think the headers would be longer on a 500 as the engine is I'm pretty sure taller which would leave lots off messing at the least, not sure on diameter of pipes.

[Bryanj]

Piece you need is same on all the Honda fours so a used one should be about and no the 500/550 wont fit

[horror]

thanks

[Yoshi823]

I have spare diaphragms/bellows for sale...or do you want a complete master cylinder (minus lever) which I also have (

[horror]

I got the diaphragm for mine from DS.
whilst gouging out the rubber goo I realised it has oozed into the cylinder. then the rubber boot part slit and came off.

I could get a repair kit for mine but thats 30 quid. then it's 30 quid for a complete aftermarket unit.
I know where I can get a 250 or 200 one for less and was hoping to do it on the dirt cheap.
I may come to you for that master cylinder, Does it have the guts in it?