Wednesday 8 August 2018

New carburettors - take two & three


With the carburettors again removed from the car, and the cause for the problems clear, it was time to address these problems. Which meant replacing all throttle and choke brackets with known original items. And as mentioned some two weeks ago, for these I used the parts that I had already prepared for the engine for the '76 FHC:


But I also swapped the different shaped choke lever link for an earlier model from the carburettors that came of the car. All pretty straight forward except for the fact that the temperatures have been well above 30°C over the past few weeks. So it all took slightly longer than expected. But early last week all parts were swapped and they were ready to go back on the engine.



Sadly while trying to do a basic tune up in preparation for the fine tuning, scheduled for last Saturday, I found out that whatever I did the front carburettor couldn't be adjusted properly. That was when I noticed a fuel leak from the float chamber of this carburettor. It turned out that the rubber seal from the jet assembly had been dislodged while changing the choke lever link. Long and very frustrating story cut short, the carburettors were removed again and I visited a friend for some much needed small parts to stop the leak and get the carburettors going properly!


And these parts (spring clips, seal and stripped jet assembly nut) were fitted to the carburettors over the previous days. Which meant I could use a bit of my spare time today to fit them back on the engine again. And with the practice and experience I got from fitting them several times over the past few weeks, this time it took me less than half an hour to fit them and connect everything. At least something positive out if it!


Remains the final task of fine tuning and balancing them. But that's for another day.

2 comments:

Phil said...

is a su carb rebuild easy?

Beans said...

Hi Phil, depends how badly they are worn. If the butterfly valve spindels have worn out the holes in the carburettor's body you'll need a milling machine to accurately widen the holes to accept new bearing bushes. The rest is pretty straightforward. And pay attention to the correct level for the floats!