Originally Posted by
fdjizm
Do the gx-7r's have different timing? basically how much am i missing out on with my 5.5 gen?(yes i know about the coating) but performance wise any real changes? minus the carb which might be better, but again i dont know.
IMO the new GX motors do perform better than the 5.5's. Possibly to do with the carb and the crank. They do tune easier (we have the long needle version here, which I believe gives smoother performance). My customers and I have now run all three models under race conditions, and the new motors just have more performance right through the power band it seems.
I rebuilt my old Gen 5 7 Port (which had a Gen 5.5 crank fitted). Put a new GX PRS set and GX coated crank into it, but retained the older long needle Gen 5 carb. The motor is wicked. More power than the old 7 port ever had, even when it was new.
As I said before, that's only my personal opinion, so it would be interesting to hear from other users who have upgraded from the earlier models to the newer GX Series.