Hello All: The one component of the KLX250s I always disliked was the muffler, both sound and looks. Yes I did the original drilling of the baffle and then modified with a larger outlet. Still not satisfied, I recently installed the HMF Slip-On exhaust. This is a high quality component from a very good manufacturer. the only draw back was the wait time to get the pipe. As they "build to order" it took about 4 weeks, but they made it up in the price and shipping. All said and done it came to 239 w/quiet insert, shipping and a tee shirt. I have all the other modifications complete and jetted to the same specs as HMF tested to as well. I struglled with the full systems as I did not want to replace the head pipe As I feel it is sized correctly. ( this goes back to a paper I wrote in school around the effects of heaeder I.D. and length realtive to HP/TQ - If you make the header to large you will loose some TQ in the lower RPM band )
Installation and fit is perfect! Plus HMF is the only one to post actual dyno results.
That all being said, I'm really satisfied with the pipes performance, sound, and looks.
( This post is intended to share information and hopefully not start another big arguement and what is better, Muzzy or Big Gun.)
See Pictures below.
Thanks
Don



[IMG]local://upfiles/1026/886E061392AC47A3A891A18A5488A9E4.jpg[/IMG]

 

whoaaa.. up until now i was under the assumption that a slipon wasnt available for our bikes?!! how was the fit? cost? part number?
also how loud is it with the quiet core? obnoxious or tolerable?

 

#2 pic

 

#3 pic

 

hows the bike performing now with the slipon compared to when ya just had the baffles drilled out etc?

 

Please see original post.
1) The fit was VERY good, no issues at all and the passenger pegs stays in place.
2) the sound w/ quiet core is very nice. Throaty, yet mellow. Even my wife says it's not too loaud at all. I didn't trust her so I have a buddy ride it and she was right ( as always! )
3) The cost was $239.00
4) the performance when compared to the stock muffler is AWSOME !!! Revs much qicker and a noticeable increase in power.

 

nice lookin pipe man. I was too impatient to wait 4 weeks... hehe

 

That looks great, Don - I really like the looks of that pipe and I figure any place that actually takes the time to share Dyno results from their work and document the jetting procedure like they did gets a big thumbs up from me. [sm=smiley20.gif]

 

Don,

I've been following this exhaust system development for a long time. I was going to order one, but they are not taking orders for at least another week.

Did you get to be a tester for them?

I can see there is going to be one and only one solution to the question of "what's the best exhaust for the KLX"? That will be a run off of all the bikes with lots of report info. Or one bike, a dragstip and lots of exhaust systems being tested.

However, for the price of $219 - for HMF Forum members - it looks like a great deal.

I do understand your comments about head pipe size.

My bike runs extremely good in the 6000 to 7000 rpm range. After looking at the dyno charts, I see why! It's a torque monster in that area! I do believe that is why it's such a great little trail bike!

 

Pretty Nice. Is the end cap bolted on or riveted on. Also how does the muffler connect to the header pipe, with just a clamp. what jets did you use and are you running a open airbox or one with the KDX200 snorkel. The HMF is still a possible for me and I would be interested in hearing more. Thanks....


LV