Yes, 1/4 thou.
1.25" min to 1.25"+1/4 thou max on the rear - should be tight. You'd never get the bearing on at +2.5 thou. Though I'd agree with Tony Press (if I'm understanding him correctly), a tad tighter say +1/2 thou would do no harm.
1.124"+3/4 thou min to 1.125" max on the front - shouldn't be nearly as tight as the rear (or you wouldn't be able to build / dismantle the engine).
I agree it's a bit confusing but take a look at the big ends and keyways, they are dimensioned the same way e.g. 1.312" to 1.312"+ 1/2. If you look up big end diameters for Reliant side valve engines, 850 Minis etc. (which are published figures) +1/2 thou tolerance tallies exactly.
1.25" min to 1.25"+1/4 thou max on the rear - should be tight. You'd never get the bearing on at +2.5 thou. Though I'd agree with Tony Press (if I'm understanding him correctly), a tad tighter say +1/2 thou would do no harm.
1.124"+3/4 thou min to 1.125" max on the front - shouldn't be nearly as tight as the rear (or you wouldn't be able to build / dismantle the engine).
I agree it's a bit confusing but take a look at the big ends and keyways, they are dimensioned the same way e.g. 1.312" to 1.312"+ 1/2. If you look up big end diameters for Reliant side valve engines, 850 Minis etc. (which are published figures) +1/2 thou tolerance tallies exactly.