Sprocket gearing

[Val]

That's what I was thinking -1 on the front wont make much difference to the rear wheel position along its ajustment slot, but to get the same result by just doing the rear sprock by going +3 then surly that would be just too much for the chain to fit.
Is there such a thing as -1 front and +1 back

Any combination is possible. The only thing you needs to check in http://www.gearingcommander.com/ is does that combination have bad same link same tooth combination. -1 14tooth and +1 49 is a good combination.

Bad combinations happen when number of the chain links (we have 110 links in FZS 600) can be divided by the number of the sprocket tooth.

Say front 11 tooth and rear 55 tooth is very bad. Actually it is the worst one that you can have. It gives same link same tooth number 1 for BOTH sprockets. Means on each rotation absolutely the same tooth front AND rear will hit the same chain link.