3 x 3 mod / pipe question

OK... I finally did the full 3 x 3 on my 400s. I'll admit that I'm not the first to part with a buck, but holy :lol: was it ever worth it!! The bike had the Yosh pipe already when I bought it so I basically only cut the hole, put in a new filter and did the jetting. My question is: I would like to (on occasion) swap out the Yosh pipe with a full exhaust system from an E model for street riding. Will this effect the jetting big time or is just a matter of turning the fuel screw a bit?? Or should I just say screw it and keep pissin' off my neighbors!! (just don't want to get a ticket for excessive noise) Any advice, as usual, is greatly appreciated. And again... if your in doubt about doing the 3 x 3, don't go out drinking one weekend and you can afford it. (and you'll have no hang over!)

I run open yosh with 3x3 and fcr. Personally I'd never trade the power for the quiet. For me, when I'm in a quiet residential neighborhood, I am very careful on the throttle. I don't think the noise level is that bad if you're careful.

I run the stock 400S pipe and an FCR39MX with the 3X3, and I feel plenty of HP in the Ass-Dyno. I had something in the back of my mind that back-pressure makes for better low end torque, where opening up the exhaust allows for high rpm torque thus higher HP. With trail riding mostly, I am happy to keep that low end torque. What's more I went to a higher tooth rear sprocket.

In short, you should try the stock pipe and see if it runs. Pay close attention to the low RPM power. Do you like that?


I agree-the throttle is like a volume knob. I stay off it in town, and they're all loud offroad, you can hear them for miles stock or open 2"core.

But I did break down and install a quiet core in my exhaust and haven't really noticed it a handicap except at full blast. I don't have the fcr though and that would max it's flow significantly earlier.

I am curious if you're asking about this for a drz/klx400 or something else. The bike in your avatar doesn't look like a klx400.

If you have a full yosh exhaust system and a stock E model drz 400 exhaust (and are putting it on a drz/klx) you'll have slightly rich jetting with the stock system if you jet for the full system (which is what you should do).

It's a 2002 DRZ400s. The avatar is my old bike... need to change that pic. That was a 98 KLX300. Great to ride.. hard to start. I picked up the DRZ for $2000 used and have put about $300 into it and its lookin pretty sweet. Runs great, but it's a little loud. I have a short commute to work so its a great gas saver and a lot more fun to drive than my truck. I was thinking of getting an "E" pipe/muffler to quiet it down a bit but was trying to find out if it would be worth it. It may be my imaginatin, but I just did the jetting (to complete the 3 x 3) and the bike seems a little quieter. Maybe because it idles much better and no longer backfires on deceleration (barely) Thanks for your input

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now