A while ago, because of the SU conversion, I did a mod to the air filter set up on Bonnie
It worked pretty well but was always a little bit noisy and when I replaced the filter last year with a bigger one it was very noisy. So I had a bit of a fiddle with some bits and pieces I had laying around.
I had an old K&N cone filter and offered it up to the original air box
A little bit shallow but the rest fitted nicely so a little bit of packing required
The inlet tract is a bit small so I welded on a length of 1 3/4" tube instead
A 3" domestic gutter downpipe elbow was a good fit on the carb side, just needed a little heat to push it on
The other end was secured by extending the original wing bolt to the carb elbow
It fits in it's new position - just
I did all this months ago and finally got a chance to try it out and it's so much quieter. Before, if you put your foot down, the induction roar was just too much for such an elegant lady but now, along with all my other sound deadening additions, the cab is a far more pleasant place to be and as a bonus she seems to be a bit more sprightly.
This was a bit of an experiment so some tidying up to do and a cleaning kit for the K&N to order.
You can see from Bonnies engine bay pic that, with the SU carb, the original accelerator cable sits at an awkward angle and makes it a little stiff. Harvey was the same and eventually the cable frayed up and jammed
So I fixed it with a noodle
Our noodles are compatible with all V-Brake systems such as Shimano, Promax, Tektro, Dia-compe etc. Promax noodles are made from aluminium to prevent corrosion and have a plastic liner to protect the brake cable.
and a universal push bike cable cut down to size
The run is now nice and smooth with no kinks
Got plenty to sort Bonnie out as well, all sorted for about a tenner