Horsepower Guestimate?

[Impulse2k1]

I just bought an 88 Katana 1100, it has a yosh 4-1 on it with a slip on, k&n pod filters, and I'm assuming a jet kit because the bike runs very well and doesn't break up at all. I was wondering what you guys think the horse power would be at the wheel or engine?

Thanks

[Slowcars4life]

I have a similiar setup on mine. A 4-1, Vance Hines exhaust, jetted and the uni pods. I would guess about 145 at the crank.

[danp2630]

1988 Suzuki year code: J

GSX1100FJ was introduced in October 1987 as a sports tourer with 16 valve engine, five speed gearbox, 16-inch 3-spoke alloy wheels. The premier model had twin front discs with gold finished disc centres and single rear disc, all three with Gold finished calipers.

GSX1100F was a high-performance sports tourer with full touring fairing with electrically powered height adjustable wind screen and wide dual seat with twin pillion grabrails. Its powerplant came originally from the GSX-R1100, retuned to provide more low-end and mid-range power. The fine aerodynamics of the GSF1100F and the 136 hp engine gave the bike very high top speed. GSX1100F was among the fastest bikes in the world at the time, if not the fastest.

The Swedish Bike magazine measured 252 km/h top speed, the Yamaha FJ1200 with similar engine performance was much slower with ”only” 236 kph. It was the aerodynamic fairing of the GSX1100F that made the huge difference.

With a GSX-R powerplant, there is no shortage of aftermarket enhancements. But there's some differences to be noted: The GSX1100F engine inhales through 34mm Mikuni flat-slide constant-velocity carburators rather than the round-slide 34mm ('86-'88), 36mm ('89-'90), or 40mm ('91-'97) mixers on the GSX-R. The sport-tourer had 4 into 2 exhaust system instead of the GSX-R's 4 into 1. The engine has a 2 mm bigger bore compared to the GSX100R, that gives a 75 cc larger cylinder volym.

As a result of the well-behaving engine and the heavier touring friendly chassis (30 mm/1.2 inches longer wheelbase) along with slightly taller overall gearing the GSX1100F doesn't feel like a factory racer. It feels more like a well-behaved streetbike. Power flows in a steady rush from 3.000 RPM all the way to its 11.300 RPM redline which keeps shifting to a minimum.

1988 GSX1100F had suspension problems (too soft fork springs at the front) with unstability problems as a result, despite of the heavy steel double cradle frame with back bone spars (reinforced the following year). The rear fork springs were later replaced by the importers for harder ones at no cost in Sweden. The 1988 also had smaller carburetors (Mikuni BST34SS) than the later models (Mikuni BST36SS), a carb kit for an 89-94 GSX1100F will not work. Four different colors: Blue, Maroon, Blue/Grey, Silver/White.

A luggage system, designed by Krauser of Germany, was an option. The electric windshield, SPS (Suzuki Power Shield), was standard on the 1100 cc models, the GSX750F didn't have it.


GSX 1100 F 1988
Overall Length: 2,185 mm (86.0 in)
Overall Width: 765 mm (30.1 in)
Overall Height: 1 290 mm (50.8 in)
Seat Height: 795 mm (31.3 in)
Wheelbase: 1,490 mm (58.7 in)
Dry Weight: 248 kg (546 lbs)
Engine type: air/oil-cooled 1,127 cc inline-4,
DOHC, 16 valves.
TSCC, SACS. 136 hp/ 9,500 rpm, 112 Nm (11.4 kg-m)/ 7,000 rpm.
5-speed gearbox.

These are the stock specs, I would assume that a jet kit, upgraded air intake and full exhaust system would put you somewhere in the 150+h.p. range. Just my .02 worth.

[Impulse2k1]

Hmmm.....thats what I was thinking myself, but just wanted to see what everybody elses opinion was

Thanks

[BIGKAT1100]

Tell me about the uni-pods. I'm still running a stock airbox. Will that set up sooth the hic-cup I'm getting between 3500 and 3800 rpm's in fifth gear.

[Swampy]

I had to go with a stage 1 jet kit and a yosh 4:1 pipe to get rid of that "hic-cup".

[Paolo]

Mine is a german version year 1995... only 98 hp ...I am trying to figure how to de-restrict it and get it to its original power ..or more (It all comes down to jetting carbs and changing exhaust apparently)
which jet kit do You guys suggest ...brand and number please
Any help appreciated
Thanx

[gonen2]

will any of the 90+ 600cc engine work in the 1988 600CC kat? or do I have to use the bigger engine 750 and 1100