I heard an interesting rumor.. the 650 prairie was detuned by kawi 3 times.. this means that there is a great deal of power in reserve. Does anyone know how to harness this extra power. I mean I've witnessed a friends 650 do 63mph on blacktop, i haven't yet had the opportunity to see what mine will do. I'm sure 60mph would be plenty, but what i'm hearing that with some reversals of the factory detunes 80mph isn't impossable. Anyone have any info on this????? Or is it just a nasty rumor to tease us speed junkies out there..

 

Hey, read the 650 governor post that is a ways down the list. It spells out a lot.

-The airbox snorkel is restricted on the end. I fixed that today.

-The CDI, according to some people, retards the timing at lower rpm to prevent the 650 from having too much. According to others, the CDI retards timing at RPMs that the quad is over 50mph. I guess I am not sure whether it is both of these or not. People are working on it right now. Rumor is that this is the easiest way to get a lot more power from the 650.

-The camshaft used does not produce higher rpm power. Comparing the torque curve of a 660, the 660 has almost as much top horsepower, but the 650 produces a ton more power at lower rpms. Changing the cam can unlock a lot more power.


from what people say, the airbox mods, and an air filter help, exhaust also, but the cam and CDI are much larger power increases.

 

Thanks for the input i will look for govenors post, what did you do to fix the snorkle?? I;m not that familar with the machine's machanics yet so explain as if i were a 2 year old. Thanks for the input.. 28" tires you mavhine must be unreal.. i'm heading to you pic's next.

 

-The airbox snorkel is restricted on the end. I fixed that today

What did you do to it and did you notice if it made any difference??

 

Susex7: Why don't you just buy a pack of Newport Lights and put a 502 CI Chevy crate motor in it with a D2 Blower and see what happens?

I would do it...but I don't wanna be like some people.

How easy are the 1" uni-filter mods to do to the air-filter cover? Is it worth the trouble?

I noticed the air box snorkel (I think), I took the inspection plate off and saw the intake vent. I'm assuming this is what you're talking about NYROC? How did you modify it?

 

502's and newports sound like fun but for sakes of atving i'll stick to the ultimite mod to date 900CC sportbike motor, What do you think parker, weekend project....You will have to show me what this snorkle thing is or where you think it is because i'm just not seeing it..Did you get your service manual yet this may shed some light on what it is that you think your lokking at.

 

Read my comments below each picture on my 650 website:

http://atv.dnsalias.com/atv/prairie6...ir=&pic=18

then click next, or go to the following.

and http://atv.dnsalias.com/atv/prairie6...ir=&pic=19


You guys decide if I was wigged out or not. I really messed up the old snorkle. It made me mad, so I really chewed up the stock air box fixing it. I'll show what I did with the drain on a later date. I am going to ride it tomorrow, so I'll let you know what it did.

Long live the ATV

 

wow is all i have to say about those's pics.. Looks like you have some time into that configueration.. What made you choose used dryer sheets??? lets us know how it performed. the snorkle you fabricated looks like it is larger then the factory one.. was this your goal???Can the snorkle be bypassed compleatly??

 

Now imagine a free breathing version of the motor with a hotter cam and higher compression, all housed in a sport chassis....tasty!

 

Susex,

-I used dryer sheets, because they are a redily available way to make goop not run and also be stiffer and stronger. ?goop? I use goop because it is flexible, and incredibly tough. It makes a permanent modification to plastic, if done right. Way better than epoxy. I know there is a better product for use on bumpers, but goop is all I really need.

-The snorkle gets air from above the radiator cap. You could remove it, but your air inlet would be lower. It is supposed to capture some water and let it leak away slowly.


-Making the inlet bigger was the whole point. Engine air is restricted by that snorkle. More air, more power (but the engine has to need more for the improvement to work). The 660 inlet has at least double the inlet area. The 660 was not detuned. A single cylinder is a lot harder to get power out of than a twin, so kawi did 3 things to kill power. Uni vents are little filters you put in the airbox lid. I don't know if they are better than what I did.

-Power? Yeah, I got more power. I have bigger tires than my 660 friend, and way heavier. I also have that huge kawasaki box. He used to pull away from me, now I pull away from him. Heavy tires and big air drag can't keep me from beating him.

The bottom line is I mostly felt the power at low and medium speeds. It was noticeable, but not huge. This seems like the same power gain anybody else has ever reported from putting univents in anyway.

The spark retard in the cdi keeps us from getting a whole lot of power over 50mph. I don't know if I need that. I got a lot more low end, and that is where you want it.





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