Posted By : Chris Taylor, 14-Aug-2006,
05:21pm
There is an O ring between jet adjuster and jet housing, and another O ring seal between jet housing and float chamber. Either one could be leaking if
you have disturbed them. Easy enough to replace, and doesn't need you to take off the float chamber. I suggest you unscrew the jet housing complete, so
you can properly inspect the jet and replace both O rings. If you carefully count the number of turns it takes to undo the jet adjuster, you should get
the mixture back close to what it was. But you will probably need to re-centre the jet if you do this (see manual) so you'll be setting up the mixture
from the "jet fully screwed up to the top" position.
You can fit 145 x 13 radials with no problem to the 3.5" wheels of a Herald. They are slightly smaller in diameter than the 5.20 x 13 crossplies
originally fitted. You can fit 155 x 13 radials but they will be slightly "bunched up" on 3.5" rims and you may find they wear the centre of the tread
faster than the outside and MAY "let go" slightly more suddenly "on the limit" although I never found that in over 30000miles on exactly that tyre and
wheel combination.
If you have 4.5" rims from a later Spitfire, 2 litre Vitesse or Herald estate, then you can fit 155 section radials with no problems at all, and I
would recommend that size.
Tyre pressures are a bit of a personal taste, but I seem to recall settling on 24/26 front/rear with 155x13 on my Herald.