Engine mods

[2005B12S]

Unless you are gonna do some other mods, the drop in's are the way to go. They will be easy on the top end and you can run the stock tensioner if you like.

Aftermarket cams are in the .370-.380 lift range which will require higher compression to really shine.

I have a set of drop-ins to install in the spring. I am not worried about losing any midrange, the B12 stock has a powerband like a big twin with peak power below 9000rpm. The GSXR cams will turn it into a real in-line 4 pushing the powerband up to 10,500rpm. This is not a 750, it is still gonna have decent midrange, even with the GSXR cams.

Good Luck, Ed.
2005 GSF1200SZ
1983 GS750ED

[Banned it.]

If I knew how to post it I have a dyno chart of my 1200 tuned last week after having worn emulsion tubes replaced. Peak power is 124 hp @ 9000 rpm and peak torque is 82 ft/lb @ 6500-7000 rpm, both figures are rear wheel.
Engine mods are pipe and muffler, reground cams, done locally in Oz, probably some GSXR grind. Cam advancer and Dyno jet kit all tuned on the dyno. The cams were the last mod I did and the instructions to the grinder were no loss of bottom end. The result was 2 hp drop at 2000 rpm, the same power as before at 3 & 4000 rpm and gains from there all the way to 9000 rpm. Torque improved all the way through the rev range.
I don't know the grind on the cams but this was the second try, first attempt was hopeless. Nothing below 7000 rpm but it did pop nice wheelies at 10000 rpm next to useless on the road. Second try they got it right. The grinder won't reveal what cam grind he used though.