Question about 2001 Suzuki DR-Z 400 SE

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Exhaust system I have an 2002 DRZ400SE and i am searching for an exhaust system that enhances the looks but mostly give the bike more power down low and through the mid range. Does anyone have any suggestions to which pipe setup they have found to work the best? Thanks, Trevor

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Yoshimura's stuff is the best under the sun. Be sure to order the TEC kit if you get it. It gives you two sound inserts. The smallest makes the bike as quiet as stock. Best fit and finish there is as well!

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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I have a TGB Akross 50 cc.Engine cuts out when going down hill. Engine sluggish down low. How do I fix this?


not enough exhaust flow will cause it to be sluggish -- open the exhaust up so it breathes.

Feb 26, 2015 | TGB Atlantis City 50 2T Motorcycles

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How to tune / de-restrict a 2 stroke


2 strokes in lower ccs are usualy slow, so heres a list of things you can do to de-restrict and tune your 2 stroke.

1) Get a racing exhaust, Key part too most 2 strokes is a good exhaust, this will remove some restrictions. Gianelli, Big One, fmf and many others are available on ebay or your local bike shop.

2) Big Bore kit, adding a big bore kit can give up to 30% more performance, and will usualy de-restrict the bike. search ebay for (Bike Model) (year) Big Bore kit. it will come usualy with everything you need for the upgrade.

3) Carbon Reed Valves, are a key part too your acceleration, also removing the little cages that stop them opening all the way and replacing with big washers is another good step, make sure theres nothing for your reeds to nock on when removing the cage.

4) Boost Bottle, a boost bottle will help 2 strokes with no reed valves more then reeded bikes but will give alot more low and high end performace. search ebay for (bikes cc) boost bottle.

5) Jets, are a key thing when getting a bore kit or race exhaust. you MUST change the jets if you change exhaust, get bigger ones if you get an exhaust go a few sizes over and check the spark plug if its a brown tan/ grey collor you got it all right, if its black it means you have to much fuel so go smaller, and if its white it usualy means not enough fuel. you can buy jets from any motorcycle shop usualy around $1 a peice. you onyl need to change the Main jet.

6) Air Filter, you dont need it on most bikes but it could add extra acceleration, measure your carbeurator intake and search it on ebay for a K&N style filter, Power filter.

7) Restrictors in the intake, some 2 strokes have restrictors between the carb and the cylinder, it is key to remove these or drill them out to the size of the carb/ cylinder hole size.

8) Sprockets, if your lucky enough to have a chain and sprockets, its a nice trick to change sprockets on your bike.
For Top Speed - Bigger front sprocket & smaller rear sprocket
For Acceleration - Smaller front sprocket & bigger rear sprocket
by bigger or smaller i mean more or less teeth on the sprocket. if you go for speed your acceleration will lack and vice versa if you go for acceleration you will loose top speed.

9) Electical Restriction, Some bikes are restricted in the CDI, if yours does not want to reach a good RPM search up CDI, de-restriction. usualy it involves cutting a wire between the CDI and engine. and will unlock that slow engine into a screaming 2 stroke.


If you follow all these steps your 2 stroke will no longer be restricted and slow and will be the fastest arround.

on Feb 16, 2010 | Motorcycles

1 Answer

How do I get to the battery to charge or jump start and or replace


The battery compartment is at the very bottom of the bike, just in front of the rear tire in a metal box, sitting between the exhaust pipes. There are two 10mm head bolts that hold a trap door closed to let the battery drop down and out.

To take the battery out, you'll first have to unscrew the positive and negative leads on the battery. The negative is on the left side of the bike (same as the gear shifter) just above the heatsink looking piece of metal. Unscrew that first.

The positive is on the right side (brake and throttle side of bike) and has a red wire connecting to the battery. You can see it just above the exhaust and brake wire as you look at the bike. Unscrew this second, then unbolt the trap door. On my bike, I have to lift up the exhaust pipes a bit to get at the bolts. Once the trap door is down, the battery will drop and you can angle it out with the bike on its kickstand.

Check intruderalert.com for more info on Intruders. They have some indepth guides and pictures. I learned everything about my motorcycle from the guys there.

Aug 02, 2014 | 2002 Suzuki VS 800 Intruder

1 Answer

Loss of power after upgrading exhaust


I'd say the loss of power is due to low back pressure, motorcycle engines especially 2stroke rely on back pressure for performance, backfiring may be due to unburnt fuel igniting in the exhaust or your fuel balance is too rich, hope that helped!

Dec 29, 2012 | 2011 Aprilia SR 50 R Factory

1 Answer

My motorcycle came with Cobra pipes and these are


Im not very familiar with your specific bike, but I do know what your problem is.cobra pipes are usually a straight-through design, meaning they have no muffler. the ones that do have a muffler usually have a very small one. smaller mufflers mean less fiberglass packing inside to absorb all of that noise. if your not too concerned about performance, then your best bet would be to go back to a factory exhaust. thats going to be the quietest one that you can use. Im sure there are also aftermarket systems available that also use a good muffler for noise control, but pretty much any aftermarket pipe is going to be louder then the factory setup. they are designed to give your engine more performance, which means less restriction for the xhaust gasses, which also means more noise due to the more open design of the pipes. Im not sure if your bike comes carbureted or fuel injected, but keep in ind that any exhaust changes made to a carbureted engine will require carburetor jetting adjustments to compensate for the change in exhaust flow. now, if you decide that your willing to lose just a tiny bit of performance for a quieter ride, then you may be able to find a used stock system on ebay for a very reasonable price. or if you want to stay aftermarket, then most companies test the sound levels of their exhaust pipes. by contacting the manufacturers, you should be able to obtain and compare the sound decible levels for different exhaust companies to find one that meets your needs.

Jul 28, 2009 | 2002 Yamaha Road Star

2 Answers

1998 Sportster XLH 1200 seems too smoky. Carb, including jets were checked - ok. Not visible smoke, but just gives rider that exhaust smell even after short trips. 14 k miles and recently serviced. Is this...


Is this a recent development? Or has it always left that smell? I had an older Sporty, that I ran too rich for years, it left lots of black soot on the inside of the exhaust tips, and a very pungent exhaust smell on your person. When I went down a couple jet sizes, it got much nicer, and ran a little better as well.

Jul 27, 2009 | 2000 Harley Davidson XL 1200 S Sportster...

1 Answer

I have a 2006 kx250f engine seems to be running fine but at 1/4 throttle engine seems to be bogging or missing a bit


I would start out with the basics first: clean air filter, new spark plug, fresh fuel. Then move to the intake and exhaust and check for leaks. A loose carb or adapter, a leaky exhaust seal. The exhaust uses a copper ring seal, they have a tendency to wear out or be vulnerable to a header that has been knocked out of alignment. If everything still checks out, try cleaning the carb, and be sure to remove all jets and blow compressed air through all passages. Next I would check for valve clearances, and if your capable, a leak-down test to check for a worn top end or valves. If the problem has seemed to be for most of the bikes life, you may want to try rejetting the bike to fine tune your low-speed circuit.

Jun 18, 2009 | 2002 Yamaha TT-R 250

1 Answer

Stage 1 Low rpm backfire


If you are running straight pipes they might not give you the right back pressure. This can be reolved by either going back to riginal pipes or instaling a bolt into the pipes about 5 inches in to make back pressure. Another thing? Did you have the bike's electronic ignition reset after you messed with it?

Jun 18, 2009 | 2002 Harley Davidson XL Sportster 883

1 Answer

RATTERLY SOUND FROM POWER VALVES OR EXHAUST CONTROL VALVE.


Gooped up power valve should not produce noise. One would think it the valve was that loose, or the spring were gone it would develope a lower, strange curved, punchy power band, but not make noise. Still, it wouldn't hurt to see which spring (or lack thereof) is in the valve.

The run-on, rough high RPM and noise would tend to make me think of a lean condition. How's the plug looking?

Apr 03, 2009 | 2002 KTM EXC 380

2 Answers

Exhaust systems


must the exhaust be specific to the model is there no way to take an exhaust made for a similar scoot and fit it to the scarabeo? What is your goal? The scooter exhausts offered by Leo Vince and Malossi aren't actual performance systems. People use them because they want to customize the scoot or get more of a growl sound while also passing emission inspections. Most people in the USA never have an emissions inspection on their scooters and are thus free to bolt on any exhaust they choose. If you are looking for performance you need an aftermarket free-flow system like those used for off-road bikes and your only limitation is how loud of an exhaust you are willing to accept. There are plenty of aftermarket exhausts for pit bikes and small dirt bikes that should bolt on to the S100-4T. Personally I would start by looking at mods people have done on the Honda XR70 since it's about the same size engine and uses the same 20mm Keihin carburetor. Of course if you bolt-on an aftemarket free-flow dirt-bike exhaust you will need to replace the existing restrictive airbox with a free-flow K&N unit and either add larger jets to the existing carburetor or switch to the high-flow 20mm PE Keihin or the 24mm Keihin. Either way, the muffler is the easy part it's getting the fuel/air mix right and that's all carburetor work. ,,,

Nov 10, 2008 | 2006 Aprilia Scarabeo 125

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