What now after installing Yoshi slip on?

1 reply to this topic

Posted September 04, 2005 - 03:00 AM


hey guys,
im pretty new to this game, so please go easy on me :D
I have bought a yz400f 99 model, and after taking some care of the little things i needed to, the time came where i had to get a new exhaust, as the old one was leaking and was dented pretty badly, and since teh front pipe was in ok condition, i just wanted to get a slip on exhaust.
I purchased a yoshimura rs3 slip on, looks nice.
Now, first of all, im not into making the most power with it or anything like that, i mostly got it due to a good deal, otherwise i would of been happy even with a stock new one.

I would like to know if i would need to make any changes to the carby mixture/jetting ect? if so, can anyone tell me what settings they have on they're carby with this exhaust(if anyone has this exhaust on?) if not, what would be the most closely recomended setting i use, since im new to this, i would like to try and get it as close as possible, so i need a starting point.
Remember, no need for outright power increase ect, i just want it to run as smooth as possible, just like stock(as i am happy with the power for now).

I havent driven it yet, but hoping to in a week or two, so any help appreciated.

cheers guys,

P.S. it has a twin air filter in stock box, if that matters.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 642MX

Posted September 04, 2005 - 09:10 AM


I've got the same exhaust on my 426. I'm at sea level 80 degrees to 100 degrees, high humidity......I run 42 pilot (stock), needle in fouth clip position, 160 main jet, fuel screw 1.5 turns out.

Related Content


Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.