I beg to differ, higher comp pistons can bring in big HP gains. One example are the 125cc pit bike engines. Standard comp is about 10.5 :1 They put out about 8-9Hp. then there are the 125cc high comp pit bike engines. These engines are 13.5 :1 and put out 17-18hp. A really big gain! In the pit bike engine world exhaust n intake only net a few HP. The big HP comes with big bore kits, or high comp engines. I guess we won't know what kind of HP numbers these 12.5:1 pistons will put down until someone installs a set. Of course adding exhaust and intake would be beneficial along with these pistons, and I would most likely do all three. Why not just buy a fz-09 you say? I heard in the states they are only 1000usd more, but this is Taiwan. The Fz-09 is nearly 3500usd more then the fz-07 here due to import tax restrictions and the fz-07 being made in Taiwan and the fz-09 being made in another countries factory. Also I like the looks/ lightness of the fz-07 over the fz-09. It would be a perfect bike if it could get a 20hp boost. looking at ways to make that happen....There is no bigger increase in performance than a full exhaust system and a fuel controller. You won't get +6 hp with a higher compression piston only.
Why are bigger pistons and higher compression pistons of such interest? It's more cost effective to take riding lessons or improve the suspension.
The Wiseco pistons are designed to be higher compression by its height/machine surface. They are 80mm 689cc stock bore. So you wouldn't need to bore the engine just pay about 420 (hah) dollars for two wiseco pistons since there 210usd a piece. I don't think timing would need to be adjusted going up in compression just from 11.5 to 12.5 and if it did it would be minimal. Costs of exhaust are subjective to brands and what not, but you can get a slip on and de-cat for less then 1000 bucks or go with a full titanium unit but exhaust is something you don't have to spend the big bucks on, you can go cheap/custom/ebay knock offs and still they flow about as much air as a top of the line brand name exhaust, just might no be as high quality/ durable but get the job done. Ok on to the next thing ECU fuel controller, I would pay no one to tune map my bike because my plan was to get an ECU and a auto-tune add on these together sale for about 500 bucks. No tuning personal or extra tuning money needed, bike tunes itself.TaipeiRyan.... if you want to hop up an FZ07...that's your business and good luck with your project , but your calculations are seriously flawed. You forgot the cost to bore the cylinders...the cost to change the engine timing for the higher compression...the real cost of an full exhaust {$900 USD} and the cost of a fuel controller and someone to make a fuel map on the dyno. So your figures are at least $1000.00 short of reality. In addition...you will need suspension work and tires. You'll end up spending $2000.00 MORE than the cost of a new FZ09 before you are done.
My opinion is that the FZ07 is not the bike to choose to drag race your buddies. You'd be better off with a used R6 OR R1.....
Ryan: have you seen this thread? It's exactly what you hoped for 20 hp more than stock at 88.55 at the rear wheel on 87 octane. If you don't want to open up the motor you can get 80 hp at the wheel with "horboys" airbox replacement a Yosh pipe and tuning. Sweet!I beg to differ, higher comp pistons can bring in big HP gains. One example are the 125cc pit bike engines. Standard comp is about 10.5 :1 They put out about 8-9Hp. then there are the 125cc high comp pit bike engines. These engines are 13.5 :1 and put out 17-18hp. A really big gain! In the pit bike engine world exhaust n intake only net a few HP. The big HP comes with big bore kits, or high comp engines. I guess we won't know what kind of HP numbers these 12.5:1 pistons will put down until someone installs a set. Of course adding exhaust and intake would be beneficial along with these pistons, and I would most likely do all three. Why not just buy a fz-09 you say? I heard in the states they are only 1000usd more, but this is Taiwan. The Fz-09 is nearly 3500usd more then the fz-07 here due to import tax restrictions and the fz-07 being made in Taiwan and the fz-09 being made in another countries factory. Also I like the looks/ lightness of the fz-07 over the fz-09. It would be a perfect bike if it could get a 20hp boost. looking at ways to make that happen....
I agree, who wouldn't like to get a little more power out of their bike. There's always at least one grumpy nay sayer telling you that will never work or that's stupid. Put a sock in it nay sayer!!I don't think 90 is too much for this bike.
I had a Laverda 750 Formula vertical twin, with a pipe that made 90 at the rear wheel on a local dyno, years ago.
The fun of getting some more ponies out of a small bike is in " racing " the bigger ones in the twisties.
