I just gotta know if these filters actually increase the power of the 650. I just put 27 inch 589 on my machine and I have noticed a lag in my top end and have lost the snap on the bottom end. I use to be able to wheelie at will in high range. Now I can only pop the front up at will in low range. I can still get her up every once and a while in high. I was wondering if the K&N filter might be able to give me back some of my lost grunt. And I'm kind of confused about these uni-vent things that I hear people putting into their breather covers. Are these things water proof and do they work. And last of all, if I do put a new filter on the machine and a set of uni-vents will I need re-jetting?
I'd appreciate the feedback.

 

I'd like to know about the questions he asked too... What are these "uni-vents" he's talking about...?

=)

 

I am not an expert on these but here is what I have gathered. NYROC tried the K&N filter and he said that it did not fit the 650 right. He had to use a silicon seal and it was messy. He said something along the lines that the Uni-vent would or did fit better.

I checked with my dealer and he said that aftermarket filters will allow better breathing than the stock filter; which will let the engine take a bigger breath; therefore, giving more umph.

Per NYROC's advice, I am going to get a Uni-vent and see what happens. I have yet to pull my filter out and run my 650. I want to do that to see how much faster it actually goes. I have noticed a little high end power loss lately. I am attributing it to the fact that I have not cleaned my filter in a few weeks and its been dusty around here.

If anyone else can affirm what I said please do. As I mentioned, I am not the expert, just passing along my perception of what I have heard.

Daryn

 

I don't like the K&N for the 650, my friend has one and it doesn't fit well at all. He ordered a Twin Air like is on mine and you can't tell the diff. in performance. you won't have to re-jet with one but it won't give a big power increase on it's own either. get a jet kit and filter, this should help give a couple hp. the Uni-vents we are useing are 1 inch round plugs with foam inside, they come in packs of 6 I think. you drill 1 inch holes in the lid and the pop in. just gives a little more air flow I have 5 in my lid, some on here have 12, the more you put in the more air get's to the carb's,you must be sure to be rich enough on your jetting with these. My jet kit instructions were rich so I put the vents in to lean it down a little. if you jet kit the bike you will have to fine tune it, It's my experience that the instructions are close but a little rich at the needle's and a little lean on the main's, at least where I live they are.

 

I felt the need to use grease on part of my K&N filter. The front, left portion of it is not continuously pressed against the airbox lip like it is the rest of the way around. It seemed that dust could get sucked past it. A lot of other quads have simliar problems, and people use grease to seal up leakage possibilities.

Filters that use hose clamps are my favorite, but I won't trade my 650 for a 400 just because the K&N would work better on the 400. So, I grease mine, and it is fine (but messier).

Like Stakk suggests, I should have gotten a twin air. The foam filters that use the kawi filter frame thingy, are pressed by the frame thingy onto the airbox lip, providing a secure seal all the way around.

The 650 has had three main detunings done to it (on purpose, for our "safety", and possibly not for any other reason):

-Timing retard. You have to get the aftermarket cdi when it is available. This will unleash a whole lot more yellow eyed fire breathing horses in your 650 than airbox mods, exhaust, filter and jetting (maybe even combined, according to rumor). More ponies per dollar spent than anything else! Still it is a good idea to have the filter, airbox, and jets ready before this comes out.

-Cam. Kawi used a cam that does not make so much high rpm. This one is a lot of work, I will skip it for now. Probably requires clutch springs to go with it.

-The airbox inlet is really small, just to keep the power down. Uni vents to the rescue.

 

Hey DUstanko

if your wondering if your high end power loss and speed are attributed to a dirty air filter I can almost say with 99.9% certainty a dirty air filter is whats causing your problem. I went on a big 4 day ride last year and it was very dusty and on the last day we were riding back to the hotel and my machine would only do about 50mph and was sputtering bad. When I got home I opened the airbox lid and sure enough the filter was a mess. I took it out and and there wasnt even a spec of dust or dirt under it. So i know the air filter was doing what it was suppose to. Anyway, I cleaned and re oiled the air filter and bought a outerwears for it and rode the next weekend after that and it was fine 66mph all the time no problem no sputtering =)

 

Thanks Lackdog,

Since my last post a few hours ago I cleaned out my air filter. It was a mess. I am sure that I will get a much better ride tonight when I go out. Thanks again!

Daryn