KTM 450xc vs yfz450r vs DS450

[tjthone]

So we made our first trip down to Little Sahara Utah. It was my brothers and mines first test ride on our bikes. During several drag races up sand mountain. My brothers yfz450r(fmf slip on and foam filter) seemed to always pull ahead. My cousin on his ds450 was right behind the yfz450r. I have the V pattern sand tires and know those dont hook up the best. But whats some good mods to get me a head. Iv read on bills pipes. Iv looked at different air box mods. even boring my carb out. Can i do like a 505 cylinder on my bike? Im new to the diverse world of ktm



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[5lblmbn2009]

no, they do not make a 505 kit for the xc. that is only for the sx. there is a 525,540, and 570? kit for the xc's. I would start with a Fast64ranchero carb for the mods. that may be enough... It really wakes these up. Gives better throttle response and several other things. Bang for buck exhaust is bills or HMF. and they are also some of the better numbers on the dyno for their price. ranchero can bore your carb also if you want. also he jets it right to get the most power out of the quad. maybe some motor work after the external stuff. definatly start with ranchero carb though. do a search and you can find out about it and contact him for more info.

[rumlesj1]

definitly look at doing the external mods first. then go inside. u will be shocked at how much of a difference getting the carb worked / new intake / bills pipe will make.

[airmobile101]

Before you start dumping money into that bike, the question needs to be asked if you have even re-jetted it? If not, you really need to rejet it. And, Im pretty sure the YFZ450X and DS450 are EFI. So they dont need to deal with jetting. Re-jet it if you haven't already and slap a aftermarket exhaust on it, or modify the stock exhaust. The stock exhaust is a joke. It is by far the most restricted pipe I have ever seen. IMO

[tjthone]

Thanks alot guys. Question, How much is it to send my carb off to Fast64ranchero? And whats a Bills pipe going to run me? Iv read somewhere like 500? And what Intake do you guys suggest?

[flooringit]

Do the carb and do the airbox mod and take out the backfire screen that's good for 1hp. Bills pipe is 560. good pipe I have one. also make sure your carb boot is same size as your carb. Lots of free mods to gain hp. Take out the spark arrestor in the can.

[tjthone]

Ok I will look into that. Hows that 570 kit treating ya?

[X~Stream Composites]

$125 for the carb job, and I have to say it is damn impressive!

[5lblmbn2009]

for aftermarket intake the only option is fuel customs i think. remove the black baffle in the airbox also. and also twin air sells some airbox ventilators that you just pop in if you cant get the mesh thing figured out.

[flooringit]

570 treats me good but what motor that makes 63,80 hp not treat you good

[airmobile101]

I might be speaking out of terms here, and I don't have no intention on dis-respecting KTM BILLS pipe,but I had a look at that KTM BILLS pipe. I think it would be great for a built motor, hell.... great for a 525xc. But I'm not sold on it for a stock or mild built 450XC. My main concern is that huge ass mid pipe that enters the canister. That will usually result a loss in low end torque for a somewhat stock 450cc engine. I do like the step-up method on the header he performed, just not sold on the entire package with that huge drag style mid pipe. IMO

[JDU450XC]

no, they do not make a 505 kit for the xc. that is only for the sx. there is a 525,540, and 570? kit for the xc's. I would start with a Fast64ranchero carb for the mods. that may be enough... It really wakes these up. Gives better throttle response and several other things. Bang for buck exhaust is bills or HMF. and they are also some of the better numbers on the dyno for their price. ranchero can bore your carb also if you want. also he jets it right to get the most power out of the quad. maybe some motor work after the external stuff. definatly start with ranchero carb though. do a search and you can find out about it and contact him for more info.

If you get the ranchero mods and a pipe, you will be blowing the doors off those other bikes you are talking about. I had a 450 with an HMF slip on and Ranchero mods and these bikes didn't hold a candle to the 450XC. Literally, for $150 or less you could get a used slip on and for $125 (may be a few bucks higher) Ranchero can do your carb up and you will be floored at how much faster your engine responds and revs up. It is night and day for less then $275!

[kiwi-craig]

ktm bills pulls more torque than anything else out there on a basically stock 525. It's not a top end only pipe, though nothing beats it there either ! Bills system actually reduces in the muffler can, no else does that. He told me they picked up torque with no top end loss with this detail. He's getting maximum extraction effect with the tapered stepped up design, then has some back pressure as well. I'd agree that a system that just steps up huge and then stays huge kills low end.

yes it is different, and yes it works…….

The CT pipe has allot more header volume than anything else out there, except the KTM Bill, and allot of people swear by the CT as been a great system with strong power everywhere.

none of the main stream manufacturers make a different pipe 450 vs 525…….. yes if you consider the volumetric's a smaller diameter might ? be better, and or a shorter length ?……. but no one has done that yet I suspect when you get down to it, it makes bugger all difference……..

[tjthone]

I cant find anything used for this damn bike?!? Where could i find a used slip on? And im not talking for the human male

[airmobile101]

ktm bills pulls more torque than anything else out there on a basically stock 525. It's not a top end only pipe, though nothing beats it there either ! Bills system actually reduces in the muffler can, no else does that. He told me they picked up torque with no top end loss with this detail. He's getting maximum extraction effect with the tapered stepped up design, then has some back pressure as well. I'd agree that a system that just steps up huge and then stays huge kills low end.

yes it is different, and yes it works…….

The CT pipe has allot more header volume than anything else out there, except the KTM Bill, and allot of people swear by the CT as been a great system with strong power everywhere.

none of the main stream manufacturers make a different pipe 450 vs 525…….. yes if you consider the volumetric's a smaller diameter might ? be better, and or a shorter length ?……. but no one has done that yet I suspect when you get down to it, it makes bugger all difference……..

See...... I wasn't aware that it reduced in the canister. Thats good info to know.

[Fast64ranchero]

$125 for the carb job, and I have to say it is damn impressive!

You know what's impressive, a 15 year old kid racing in the expert class, getting grouped in with the Pro-Am unlimited class and pulling 2 holeshots with a completely stock 450SX (well stock except for my carb mods) now that's impressive!

[tjthone]

You know what's impressive, a 15 year old kid racing in the expert class, getting grouped in with the Pro-Am unlimited class and pulling 2 holeshots with a completely stock 450SX (well stock except for my carb mods) now that's impressive!

I will be pming you soon sounds like your the man with a plan

[X~Stream Composites]

OK, now that I have 3 races on the carb I can bitch a little. Got the carb returned very quickly and bolted it on. Turn the key on, pulled the choke, 2 quick stabs of the throttle and the quad came to life. I let it warm up on the stand, snapped the throttle and NO throttle bog. Installed brand new EBC Extreme duty clutch, 2 liters of Motorex 10w50 Synthetic and seated the clutch. Went up to first race, as posted before, and my son got both holeshots. 2 weeks later we have our second race, and 2 more holeshots. What can be better, quad ran flawless!!!!! Went to go load up the quad, and there is hardly any clutch bite. Take the quad and tear open the clutch, and the brand new clutch is worn down a full friction disc thickness. Order new KTM factory clutch, install it, seat the clutch, and at the next race.... 3 holeshots... 3 moto format race. So I guess the carb is awesome if you don't like your clutch! haha

I guess this is a great problem to have, I really can't speak high enough of how much smoother the quad runs now. I know this sounds like I am advertising for him, but I paid full price just like everyone else. I just like to let people know the good and the bad of my experiences!

[sticko2]

OK, now that I have 3 races on the carb I can bitch a little. Got the carb returned very quickly and bolted it on. Turn the key on, pulled the choke, 2 quick stabs of the throttle and the quad came to life. I let it warm up on the stand, snapped the throttle and NO throttle bog. Installed brand new EBC Extreme duty clutch, 2 liters of Motorex 10w50 Synthetic and seated the clutch. Went up to first race, as posted before, and my son got both holeshots. 2 weeks later we have our second race, and 2 more holeshots. What can be better, quad ran flawless!!!!! Went to go load up the quad, and there is hardly any clutch bite. Take the quad and tear open the clutch, and the brand new clutch is worn down a full friction disc thickness. Order new KTM factory clutch, install it, seat the clutch, and at the next race.... 3 holeshots... 3 moto format race. So I guess the carb is awesome if you don't like your clutch! haha

I guess this is a great problem to have, I really can't speak high enough of how much smoother the quad runs now. I know this sounds like I am advertising for him, but I paid full price just like everyone else. I just like to let people know the good and the bad of my experiences!

Are you using an sx? If so you need the Honda clutch setup. You don't want to be putting the ktm clutch junk into your oil.

[kiwi-craig]

part of the problem with the clutch is the stock springs are on the whimpy side for quad use, get some aftermarket heavier springs in there.............
was your oil black and quite thick............ the stock clutch fibre is a killer..............