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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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

What modified exhaust system is best


exhaust systems are more complex than just sticking on any old thing
exhaust systems that are "mandrel bent) have a smoother flow of exhaust gas
systems that have a balance pipe between banks is a must but the balance pipe has to be of a particular size
to understand an exhaust system you have to have some understanding of how it works
yes--- it takes the exhaust gas out the back and sounds real good when it is loud and if that is all you want then any system will do the job
the fact is , exhaust systems when operating correctly are designed to move the gas at such a speed so as to have the low pressure shock wave return to the exhaust valve at the moment when it is opening and so the compression gas exits into a low pressure are
this low pressure shock wave is created when the high pressure of the expanding gas in the exhaust reaches the end of the pipe and explodes into the air.This creates a low pressure in the pipe behind it which then travels back up the system to get to the exhaust valve at the precise moment it opens
Now if the system is too long, too big or has too many bends or wrinkles in the bends, that movement of the low pressure is lost to the exhaust valve and so the gas escapes into a pressure area
in effect exhaust gas flows as a pulse as each exhaust valve is opened in succession
this pulse is what is heard as a loud noise from a bad system
it indicates a system that is not getting fully performance from the engine
another point --- exhaust gas noise echoes in a pipe as like ripples from a stone dropped in water
to have an efficient exhaust system that is quite , that principle has to be acknowledged and the system muffler silences that echo without affecting the gas flow
that is why a muffler works as it shuts down the echo out the pipe but it also blocks the gas flow
items fitted such as "hot dog " type mufflers absorb and the way such a muffler is fitted depends on the amount of echo captured the echo with out affecting the gas flow
so now having some understanding of the purpose of an exhaust system , you should be able to select a performance enhancing system with out the noise problem that will attract the law enforcement agencies
the cost is no guarantee of performance but design suited to the car is

Sep 08, 2015 | Cars & Trucks

1 Answer

BEST HIGH PERFORMANCE EXHOUST FOR 2002 SUBURBAN 1500 5.3L FLEX FUEL


Most are the same but some depends from how you drive your car,if you need to drive it more aggressive then you need an high degreeexhaust that keeps temperatur low and protects the parts.
a "synthetic high performance exhaust " will be the best for your car!
hope that i helped you,
by Cris,the Best on FixYa

Jul 06, 2014 | 1999 GMC Suburban

1 Answer

Exhaust system ofr jumbuck


you can go cheap and use a common bend extractor and regular exhaust system or you can get better with a mandrel bent extractor. Use performance muffler and pipes about 1/2 inch bigger than standard . Extra large looks good but will reduce performance and the cost will not be worth the effort. Exhaust systems to work have to be tuned to the engine . They have to be designed so that the shock wave from a power stroke enters the extractor at the exact moment that the previous shock wave that reached the end of the exhaust pipe has turned into a low pressure area and travels back to the extractor to arrive at the moment the exhaust valve is opening so allowing the compression gas from the power stroke to exit into a small low pressure area which in turn sucks out the used gas. That is why wrong size exhausts area a waste because the low pressure hits the exhaust valve and becomes a high pressure area as it rebounds back down the pipe and the exhaust dumps the power gas into a pressure area and not a vacuum. There are books on tuning exhaust systems that will explain it in more detail but you will find that bigger is not better . It just looks tuff and noisy and is next to useless when it comes to performance.

May 21, 2014 | 2006 Proton Satria Neo

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

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

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