okay i have a 00 model F4 i was wondering what stock hp was at rear wheel.i am in the processe of change the sprockets(16 front 48 rear)and went to a 520 chain, installed a kn airfilter, puting on a full akrapovic race exhaust along with a dyno jet kit stage 1. will this stuff gain me any rear wheel hp? and if so how much should i get. thanks

 

dunno about the Hp at the wheel, stock at the crank is suppose to be 110, the parts you put on will defiently increase hp but would have to go get a dyno to know exactly...

 

Depends what you believe....numbers were from 92-98hp....I would hope for 103-106 with your mods....Akro makes a serious pipe, so a 10% gain is not unheard of.

But, keep all your stock carbs parts after the jet kit install...if you want to go back, you'll be glad you did.

 

thanks will keep stock carb parts. i will let u know the hp when they install the jet kit and dyno tune it. i hope to get over 100 hp.

 

I was at a dyno night with the CBR when I first got it... 3 cbr 600 f4's were there, mine with a full D&D, another D&D and a full hindle. The guy with the full hindle got an honest 102, the other d&d got 95 and mine was way lower at 85-90.

I'm working on mine as I know I can get 95 rear wheel out of it with just a bit of clean up. I know I'm running a bit rich... I know a few people that tune bikes so I'm going to swing by there and get her done properly.

I run a -1,+2 520 and a K&N... Akro makes a great pipe, and I figure you could get to 103/105 rear wheel if you speed the money getting it tuned.

Check out my photogallery for various charts on hp and speed to gear rations.

Woot.

 

I heard D&D pipes make you lose HP. Just what I heard dont know if its true. And about the HP gains, you would only gain HP with the pipe, filter and jet kit...The sprockets you gain more low end torque not HP, but it is noticable. And for the sprockets you should go down to 15 tooth on the front and 48 sounds good on the rear. Stock sprockets are 16 front, 46 rear.

 

I do have a pipe, filter and jetkit - but I feel that the bike is rich from the observations I have made...

As you say, the sprockets don't change hp, however, they bring the torque up at the speeds I actually ride the bike... and the hp curve down to the speeds I actually ride - as I don't actually take it to either its stock or modified top speed it doesn't effect me (other than the higher RPM on the highway which is a bit of a pain.)

D&D power loss - I'd be surprised if you actually lost hp, but overall they are a loud pipe instead of a performance pipe. It wasn't my choice of pipe, and it may be replaced soon for a prettier, quieter and more power pulling pipe.

Hindle on the otherhand made a good F4 pipe... and Ackropovic generally make great pipes.

 

I'm pushing 95 RW horsepower on the last dyno (K&N filter & Two brothers slip-on).
Going to get her dyno tuned this summer & I'll post up the difference (added jet kit, timing advance). Guess i'll see.

 

My bike is dyno'ed at 119 at the wheel, I have a stage 2, K&N filter, ported and polished heads, full jaradine exhaust, and a little extra work. Im in the process of adding a 50shot wet nos system......

 

Have you got a dyno - I'd like to see that curve. Torque would be ideal, but hp would be nice