Hi folks,

I have a new KLX250SF. I just put a couple of hundreds miles on it and I was wondering if you could suggest some mods to uncork it. My understanding is that the engine is the same as the S version.

Here are my ideas:

1) Getting the Two Brothers M7 slip on exhaust (I've seen it on eBay for $295).
2) Rejet the carbs

Here are my questions:

1) Do I also need a different air filter?
2) Any other important mods I'm missing?

Thanks in advance for your help!

 

welcome to KF. mods? hmm i don't think these guys mod them very much. try search button. you might get lucky

 

Rejet it for sure, aftermarket air filter, and exhaust. Welcome to the forums.

 

Thanks for the welcome!

I'm doing some research in the forum about the slip on exhausts, and I think that formy KLX250 SF the are 3 candidates:

1) Muzzys: looks nice, not too loud (93 dB) but expensive ($489)
2) FMF Q4: looks nice but from what I read in this forum the quality is substandard ($359)
3) Two Brothers M7: looks nice, is very loud (over 100 dB with no tip) and it's the less expensive of the three ($295).

Any comment on the finishing quality of the Two Bros slip on?

Thanks in advance!

 

The Two Brothers is just a slip-on and not a full system IIRC that's why its cheaper. The $489 for the Muzzys is for a full system. Where did you find one for that price? I thought they had gone up to $500 everywhere.

 

You can get the Q4 slip-on for $287 plus s&h on e-bay. The header is gonna put you back another $200 though. That muzzy is as loud if not louder than the two-brothers.
Along with the after market air filter you should take the snorkel out of the airbox lid and make that hole a bit larger. I'd go with a 1/4 turn votex throttle cause your on the street all the time but that's just me. Depending on how soft your front brakes are I'd consider a stainless steel front brake line. For a bit more giddyup you should think about dropping your front sprocket to a 13 tooth or go up a couple in the rear. You will lose some top speed but it's minimal.

 

Substandard quality for the FMF? That's strange, they usually have great products. I'm actually looking at buying the entire system off ebay.

 

I wouldn't say the FMF's quality is substandard. It's a nice looking can that's well-built. I got my local Kawi dealer to price match Dennis Kirk at 300 USD. Another $30 in factory parts (pilot, main, needle), a KDX200 snorkle, high-flow air filter, and it's a nice mild setup.

My main concern was noise- I wanted a Two Brothers, but I got to hear one IRL and I think it would be too loud for me on my commute.

 

FMF Q4 is the quietest of all, unless you open her up. The quality from what I've seen of mine is above average. JMO
Welcome to the forum!

 

Two Brothers make a quiet core insert. But I like mine loud, keep others aware of your presence!

http://cgi.ebay.com/ebaymotors/ws/eB...m=200362474566