I own a 98 Sport 400.

I am thinking about installing a new aftermarket pipe.

I have read that new Clutch Springs are necessary. Are they? Can I get by without installing them? How hard is it to install Clutch Springs?

How about re-jetting. Do I need to re-jet also? How difficult is it to re-jet a Sport 400? I ride at sea level in Mexico.

Thanks for any help!

Rob R.
Phoenix, AZ
98 Banshee
98 Sport 400

 

Depends on the pipe your getting.
Which is it?

 

Most pipes will at least require a jetting change. Any pipe that will over-rev by 500-700 rpm needs to have both clutch springs changed to take advantage of the gains the pipe has made. If you don't, chances are good the bike will actually be "slower" than before the pipe change because you have changed the effective power band of the engine and will no longer be operating in it with the old stock clutching. If you don't change the springs, don't change the pipe either. All you will gain is noise.

<A HREF="http://www.godigital-design.com/96Polaris.html">Schultz Motorsports</A>




[This message has been edited by Jack (edited 10-10-1999).]

 

There is not a pipe out there that is so radical that you NEED to change your clutch. To best use that power you may need to make changes to your clutch. It depends on how you ride and what you are looking to do. All the pipes I know of for your model will require a jetting change. The company selling you the pipe should be able to tell you what to use. A jet is only a couple of dollars and if you pull your carb and flip it over so you are staring at the bottom of the float bowl there is a large plug there. Unscrew it and the main jet will be staring you in the face. Clutches are easy to do and if you need more help Email me at sabhburdick@netzero.net.
Scott.

 

I have not decided which pipe to purchase yet. Any suggestions on which one to get considering I am not going to put clutch springs in?

How does it sound? I am looking for the high pitched, two stroke "ping" that my Banshee makes with Paul Turner pipes.

How difficult is it to get to the 400's carb to re-jet it? How many sizes should I go up? I ride at sea level in Mexico.

Thanks!


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My bud has a 98 Scrambler. He put a Dynoport pipe and Silencer on it and it is a whole new machine. Tons more power. He did not change the clutch yet. My next quad is going to be a 00 scrambler 400 with the same Mod.

 

Some pipes, and Dynoport is one of them do not allow the engine to gain rpm's. Their power is made within the same rpm range as stock. Using clutch springs with a Dynoport pipe would negate the effective range of the pipe.

 

Go with the DynoPort pipe, I have had one on my 99 Scrambler for about 5 months and it is the best investment I have ever made for a quad. You do not have to clutch your quad, the only thing that you have to do is re-jet it. The stock jet in a 400 is a .230 and with the DynoPort they give you a jet of .240 for summer and .250 for winter. It is easy to re-jet, all you have to do is remove your seat, remove the airbox (2 screws), then there sits the carb. From the left hand side reach in there with a long flathead screwdriver and remove the clamp so that you can remove the carb. Take the carb out and take off the bowl at the bottom, replace jet, reinstall everything and away you go. You will not believe the power that the DynoPort pipe brings to your quad, it is an instant and I mean instant change that leave others behind. If you have any questions call DynoPort ( (315) 253-9631 ), they will answer all that you need to know and make you feel more comfortable with your choice. If you have any more questions just drop me an email. Happy Riding!!

Chuck 99 Scrambler 400, DynoPort Pipe!

 

As Jack said though a Dynoport pipe is made to produce it power at the engines stock RPM's (5600, I think). If you make any other mods that cause the engine to produce more power, and higher RPM's you'll need a new pipe to compensate.

I guess if you just want a pipe and dont plan on any other mods go with the Dynoport. Otherwise I would suggest an RCR or HPD combo. Yes, both of these pipes will require a spring change, but in the long run will allow you to build your engine up a bit more w/o having to buy a new pipe.

Trust me, goto Jacks' page, look at all the BUILT 400's and see how many are using Dynoports.....0 (not that I'm saying they're bad, by any means). They just dont offer the flexibility to make many mods to your motor.

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Jerry Goodman '99 400L, '98 TBlazer

 

Go with HPD they have a 400 racer(I think the only brand to have one NOTE I think!)
They have a race motor (400 2-stroke) over 70hp!!!!
Check out www.hpd-inc.com for prices and items

Steve - xpoltech