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Discussion Starter #1
69.8 MPH on the Garmin Etrex legend is the top speed.


As we all know, everyone says that the KFX450R is geared low. This KFX450R has the most HP in its class and is a fast revving machine. SO please do not be diappaspointed. I am very happy with my purchase. This machine is set up for MX and XC as far as gearing goes. It has a ton of torque to take off and get off the line.

Also, the KFX has amazing handling and power on the track. Its unbelievable and is geared just right. It keeps you only switching between 2 gears while any higher geared ATV would keep you shifting alot. I think Kawasaki got the gearing right. I did some more research and found out the dirtbike has similar compression to the KFX450. 12.0:1 for the bike and supposedly 12.1:1 for the atv. Bore and stroke is the same. The dirt bike puts out the most HP in its class also.

Mostly this engine has low end torque and it great for taking off and going around the track and pulling out of corners. You dont really have lean as much as my YFX450.

And as for the trails, it works the same way. All the torque you need to dodge the trees and pull out of the Corners. The kfx also is a high revver. One thing I noticed is that the YFZ feels like it hits hard and thats cause it has no bottom end so its blah to whoah, theres the hp. While the kfx is whoah to wooter better shift.


My idea is to take 3-5 teeth off the rear sprocket. if anyone has info, please post it. I will be getting the skids this week, a crower cam, power programmer and exhaust. I will keep you updated.

Jeff
 

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The only thing I disagree w/is gearing on the track. I race and sponsors helped set me up on a KFX to test and build this year and race Quadcross and such next year on all out. I tested at the press conference and I heard more than a handful of complaints on the gearing as well as from myself. All were very experienced riders too.

On the track the KFX is a pain, especially in high speed w/stock gearing. Put on 18's and you'll never leave 4th gear. That is my and nearly everyone I've reads' only complaint really. I love the machine otherwise.
 

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Discussion Starter #3
Your prolly right, Im not experienced on MX but we have a oval track and it is geared perfect for that. I mostly ride XC. I was thinking just gearing it would be fine. Where did you get your sprockets?

I noticed more after riding, if I already havent said it already, is that it has so much power you can go through the gears in second and by the end of our drag strip you are pinned. I removed my air box rubber breather and it feels like I lost bottom end.

But it revs hard ad fast. With sprockets it will put all that power to good use.

Jeff
 

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I just got one of thr 450F sprockets to go up one in the front for now but haven't even tried it yet. Not sure if it will work but good chance and there aren't any sprockets available elsewhere yet. Might have to go up two on the front or equivalent for high speed MX tracks. It has good power and revs but compared to the quad I've raced the past two years it is majorly underpowered. Shouldn't take much to fix it though; still stock.
 

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Discussion Starter #5
Good to know the kx450f front sprocket will work. I was afraid that one more tooth might be too big to fit on the front. I didint look too good. What is the stock amount of teeth and what amount did you buy?

I know its underpowered compared to our modded machines but as far as the stock ones go, its all in the gearing I think. Just my opinion tho.


What do you plan on doing for mods on your kfx?

Jeff
 

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I don't know if it'll work but was told it should but could return it if it didn't. I went up 1 on the front but can't recall the teeth amount. I want to say stock is 13.

Mine will be fully long travel, Fox Evols, etc. Full MX quad when built but I'll be building throughout the year while racing a C'Dale since it already is top of the line everything, including Evols and some massive horsepower when I finish it.
 

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Discussion Starter #7
I went out to the shop and its a 14 tooth front sprocket and a 38 rear. I cant seem to find a 15 tooth for the dirt bike on dennis kirk at all.

Jeff
 

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I checked b/c of that and what I have is a 15. It's a Renthal and was sitting on the shelf in a local shop. Not sure if it was a custom order or what. If it doesn't work though they said they'd refund it though so I guess we'll see.
 

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Crower has a cam for the KFX?


QUOTE (PCMamerica @ Apr 8 2007, 12:03 AM) index.php?act=findpost&pid=969
69.8 MPH on the Garmin Etrex legend is the top speed.
As we all know, everyone says that the KFX450R is geared low. This KFX450R has the most HP in its class and is a fast revving machine. SO please do not be diappaspointed. I am very happy with my purchase. This machine is set up for MX and XC as far as gearing goes. It has a ton of torque to take off and get off the line.

Also, the KFX has amazing handling and power on the track. Its unbelievable and is geared just right. It keeps you only switching between 2 gears while any higher geared ATV would keep you shifting alot. I think Kawasaki got the gearing right. I did some more research and found out the dirtbike has similar compression to the KFX450. 12.0:1 for the bike and supposedly 12.1:1 for the atv. Bore and stroke is the same. The dirt bike puts out the most HP in its class also.

Mostly this engine has low end torque and it great for taking off and going around the track and pulling out of corners. You dont really have lean as much as my YFX450.

And as for the trails, it works the same way. All the torque you need to dodge the trees and pull out of the Corners. The kfx also is a high revver. One thing I noticed is that the YFZ feels like it hits hard and thats cause it has no bottom end so its blah to whoah, theres the hp. While the kfx is whoah to wooter better shift.
My idea is to take 3-5 teeth off the rear sprocket. if anyone has info, please post it. I will be getting the skids this week, a crower cam, power programmer and exhaust. I will keep you updated.

Jeff
 

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Discussion Starter #10
Supposedly they do, it was on another post on this website. A sposor made a list of what they sell then made a list of what was available for the kfx450r and a cam was ready. It makes sence since the bike motors been out a while and its almost the same as far as compression and bore vs stroke. They just neeed the cams for the atv though. I am calling on monday and I will let you know.

Jeff
 

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i personaly like low gearing, it may not be good for getting yourself out of a big mud hole
but it will be perfect for most of the tracks i will be riding at. jumps out of corners, short straight aways ect.
 

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Discussion Starter #15
I didnt think about it but 22 inch tires would work but i think they look goofey on some atv's but would be great for xc.

I also thought of the 6th gear but it wouldnt be practicle since the machine is ready for the next gear after i just shifted into the next. I guess if it was geared higher and then a 6th for road riding would be perfect for me.

Jeff
 

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QUOTE (PCMamerica @ Apr 8 2007, 06:42 PM) index.php?act=findpost&pid=993
I didnt think about it but 22 inch tires would work but i think they look goofey on some atv's but would be great for xc.

I also thought of the 6th gear but it wouldnt be practicle since the machine is ready for the next gear after i just shifted into the next. I guess if it was geared higher and then a 6th for road riding would be perfect for me.

Jeff
I'm not talking road riding. I'm talking xc racing. Like when your in a feild section.
 

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QUOTE (Psychosis @ Apr 8 2007, 06:27 AM) index.php?act=findpost&pid=979
I checked b/c of that and what I have is a 15. It's a Renthal and was sitting on the shelf in a local shop. Not sure if it was a custom order or what. If it doesn't work though they said they'd refund it though so I guess we'll see.
I just looked at Rocky Mountain and they have 15 tooth KX450F front sprockets for 20 bucks. I'm about to order one to run at the dunes. What do you guys think?
 

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I'll check the sprocket tomorrow. I dropped the quad at a storage container and haven't tried the sprocket yet. If it fits I will let you all know tomorrow so nobody takes my word and spends money on something that'll go to waste if it doesn't work.
 

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QUOTE (Psychosis @ Apr 9 2007, 02:47 AM) index.php?act=findpost&pid=1002
I'll check the sprocket tomorrow. I dropped the quad at a storage container and haven't tried the sprocket yet. If it fits I will let you all know tomorrow so nobody takes my word and spends money on something that'll go to waste if it doesn't work.
Sounds good. I'll check back here first before I call it in. Thanks man.
 
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