GOT IT DONE FINALLY 27.3 hp WITH YOSH FULL SYSYTEM - K&N FLTER AND PREFITER - XR250r REVBOX - 155 MAIN JET - 40 SLOW JET AND 1 NOTCH ON NEEDLE .....DID NOT GET A BASE RUN WHEN STOCK BUT WILL GET THAT LATER...NEXT STOP 440KIT AND CAM...

 

So you spent all that money to lose HP?

 

aren't they supposed to be 26 stock?

if you are only putting out 27 with those mods my 16 my 300ex makes doesn't seem that bad!

 

claimed hp and acutual hp can very. We need to find a baseline test to compare it to. Even if there is a stock run. It should be done on the same dynometer. Someones other run in a different state different climate might have different stock hp resulus. How ya like that I used different 3 times in one sentence. what did gt thunder test say.

 

Different dynos and different quads will show different stock and modified HP. Two dyno readings from two different dynos aren't 100% comparable.

 

is that 26hp stock at the rear wheel or at the flywheel?? theres a BIG differance there.

 

Wow, I thought the full yoshi put out 4 horses, with all your mods I think you should be putting out like 32 horses.

 

WWW.Dynojet.com has the stock HP and Torque graphs. Stock is about 26 hp. I have heard dyno results can vary dramatically from one dyno to another. Is your air box lid still on? Do you have anyone with a stock 400ex to race to see if yours does perform better?

 

The hp stated is at the rear wheels
not at the crank like most people state....And this is in Indiana the air is differant from state to state....Why dont the rest of you guys run yours and see what you get and then we can compare ....i also work at a dealership so mods are not as EXPENSIVE....

 

I CANT BELIEVE YOU GUYS ARE STILL BELIEVING THOSE PIPE AND SILENCER ADDS...AINT NO PIPE GOING TO BOOST HORSE POWER MORE THAN 1 OR SO....THEY ARE FULL IF IT...WHAT THEY DO IS TAKE A READING AT EVERY THOUSAND RPM...IF IT GAINED ONE HP AT 1000 AND KEPT THAT SAME HP AT 2000, THEN THEY COUNT IT TWICE AS 2HP GAINED!!!