C90Club.co.uk

Do a search of local engineering firms for one that has a spark eroder bud

Bern would spark erosion work with brass being a preferential target over the ally carb body?

I had to cut off all the floats, and work the pivot pins free with vice grips but it was all worthwhile as the corroded alloy posts all survived the process.

If only that pin hadn’t broken off.

Defo time to look at an SU conversion....

Diesel Dave wrote: ↑

Fri Apr 16, 2021 7:53 pm

Bern would spark erosion work with brass being a preferential target over the ally carb body?

Good point, not sure on that, but wire erosion should work as it's directly targeting the brass

I don't think wire erosion is going to work, as it would need to cut a pathway through to the bit where the port is blocked by the broken brass tip.

Time to consider making up a manifold for an SU carb.

I’ve dropped the carb bodies off at the sonic tank shop with instructions to use all the heat possible.

On the plus side the 400 auto’s fuel consumption has improved to 65 mpg.

Diesel Dave wrote: ↑

Sat Apr 17, 2021 4:38 pm

I’ve dropped the carb bodies off at the sonic tank shop with instructions to use all the heat possible.

Who/where? Asking for a friend.

More polite version. David could you let me know who you are using. Thanks

Steve Parker has a nice shiny new one thats big enough for a bank of 4 nap carbs.

Diesel Dave wrote: ↑

Sun Apr 18, 2021 5:39 pm

Steve Parker has a nice shiny new one thats big enough for a bank of 4 nap carbs.

Thanks, I'll pass it on.

Don't you just hate undoing past bodges? Especially if they are not your own!

So lets talk brakes on the CB400A - a shinier example of the mark you would never find.

Rear brake was marginal, shoes were new but the operating arm angle was 'odd' and the rod from the lever to the arm was clearly new and obviously too short so the arm had been moved on the splines to compensate - also the pedal was too high for comfort.

A replacement 2nd hand brake rod was sourced and fitted and the pedal stop had to be bent back into the correct position to work properly - result is the brake actually works fine now.

If only the f'wit that done it hadn't binned the brake wear indicator to cover his tracks.

Front brake - this is a doozy.

The calliper carrier mounting bolts have different threads..........f'kwit had forced a coarse thread bolt into the carrier, also its weeping fluid probably because a rusty piston has been re-used with a new seal kit.

'Lord help me understand'

For those unfamiliar with the saying a strongly suggest an evenings viewing of Vice Grip Garage on You Tube.

Dave, i used these people once some years ago, i see they are still in business
https://www.carburetterexchange.co.uk/