>> http://www.gstwin.com/dyno_run.htm
That indicates only 43,4hp with K&N, V&H supersport exhaust and Dynojet kit... but mains are 122???

Now I am confused - why should somebody not use bigger jets on that dyno run as those jets are not even standard size (127/130) or what?

Am I correct that richer mix will result with bigger jets and with K&N and jetkit it should be more powerful than those lousy 43,4..?

Wich are the jets (mains and pilots) that man should order to get more power than Anne`s old bike above?

*Not talking about all those tapered filters and straight through exhausts as those are essential when increasing power and decreasing MPG .

43HP is all you're going to get. 127 mains is about where my race bike is. Otherwise start doing CAMs, shaving the head, different pistons, overbore kit etc.

Yea 43 to 44 or even less is about right...and more motor work is needed...just pipe and filters and jetting wont do past that...but 122 mains is right...Dyno jet uses some freakishly small needles...125 and 150 for stage 1 and 3 are with the stock needles...Not the same thing...cant compare them straight across...
Cool.
Srinath.

I guess the 43 HP are measured on the wheel. why does my 1994 GS owner manual  says my byke has 52 HP?

Quote from: JuanferI guess the 43 HP are measured on the wheel. why does my 1994 GS owner manual  says my byke has 52 HP?

Maybe Suzuki stole the numbers from the Ninja 500's Owner's Manual

It's wishful thinking - the 52 HP may be the numbers at the crank - always higher than rear-wheel horsepower estimates.

check this link,

http://www.suzukicycles.org/GS-series/GS500E.shtml

It has a description of every GS model year by year. You can notice that earlier models figure with more power. I already wrote to the web master and he told me that the carbs sizes has been modified on the last years to adjust to gas emmission laws.

what do you think?

Well The site is hardle accurate...they have wrong pictures per year on the bikes and 95 evidently went to 45.5 and then the next year it was back to 52...and then back down to 47...I doubt any of it is accurate and I dont think they did anything with the carbs either. So this is just a little more than conjecture...However in 96 they changed the internals and made the motor much tighter...(more engine seizing cases on 96+ bikes as a side effect). That probably sucked up some power.
Cool.
Srinath.

52 HP is at the crank.  When you see a dynojet/facotry dyno run it measures at the rear wheel.  The drive train saps power so rear wheel will have less.  Thats why factories boast those big HP numbers on sportbikes then dyno charts in bike mags come out and power is always 20 or so hp less.

So a piped and jetted GS might make 58 hp at the crank.

do all the bikes from different years (I mean stock bikes) have the same power?

The carbs did change size in 2000 ('01?), but other than that all the engine parts have the same numbers in the Suzuki parts catalog. The different carbs probably make some difference one way or the other, but the engines in all the other years are made from the same parts so they will have roughly the same power.

Two identical engines can have considerably different peak hp, due to manufacturing tolerances. This can easily be over 10%. That is why people "blueprint" engines. If you get all the parts to the exact nominal dimensions, rather just within the allowed tolerances, the engine will operate as it was designed.

We have a club dyno at our track, and box stock SV's running in the SV Cup are up to 8 hp different. The ones with the low hp numbers are difficult to get up to the stock high hp ones, even with aftermarket exhausts, K&N filters, snorklectomies, etc.

The casting tools for the engine wear out, so the inlet and exhaust ports in the head change over runs. And then they make a new master tool, and it will be more or less the same, but ports may change enough to make a difference. Or the cumbustion chamber shape might drift a bit and some have higher compression, or a thousand other dimensions all change a bit that affects the HP.

40 hp at the rear wheel is pretty good for a stock GS.

perfectly clear. Thank you so much.

Quote from: john52 HP is at the crank  

No, 52HP is at the brochure.  :nana:

43.7 here  :mrgreen:

Quote from: Juanferdo all the bikes from different years (I mean stock bikes) have the same power?

All the tests I have listed over the years shows the HP and Torque to be very consistant from 89 to 02 models.

http://members.aol.com:/jcprrp/GS500tests.txt