18 FC450 more bottom end

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12/9/2017 3:28 PM

Bought a 18FC450 and rode it for the first time yesterday, the motor lacks bottom end compared to my 17 450sxf. Im going to change the gearing to 14/52, then maybe look at pulling the spark arrestor out of the muffler if possible? Otherwise maybe look at purchasing an aftermarket slip on.
Has anyone drilled holes in there airbox side plate?
The power on the husky is almost to smooth. I found myself using 2nd in corners which i never had to do on the ktm. I don't mind loosing top end power, I'm more of a lugger.

Any other mods?

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12/9/2017 3:39 PM

I drilled holes for my fc350 and seemed to be a bit better. Nothing crazy, other than dirty air filters

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12/9/2017 3:53 PM

calvinm48 wrote:

I drilled holes for my fc350 and seemed to be a bit better. Nothing crazy, other than dirty air filters

Yeah i ride alot of sand so my filters get pretty dirty easily so im not to excited on drilling holes but in saying that i never had any dirt get past my airfilters on my ktm (125hours old)

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12/9/2017 4:54 PM

Remove the screen in the exhaust, remove the backfire screen on the filter cage or get a 2 stroke cage. Aggressive map, VP T4 fuel.

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12/9/2017 6:29 PM

Drill a few holes in the Airboz, and remove the filter screen and spark arrestor like others have said.

With a FMF pipe and also remap mine will pull 3rd all the way around the track..... 3rd gear wide open is very fast!

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12/9/2017 6:30 PM

I just went up one tooth on the back as well since it felt geared a little long

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12/10/2017 7:06 AM

14/52 is good. Install a black throttle cam from a 17.

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12/10/2017 7:28 AM

HC piston & cams. Maybe get a more aggressive remap. Turn the throttle more lol

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

12/10/2017 7:55 AM

Remove the restrictor in the exhaust

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Tomac and/or Anderson for 2020.....

12/10/2017 10:05 AM

How would 14/52 be for MX? I’m debating on trying this ratio soon.

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12/10/2017 10:52 AM
Edited Date/Time: 12/10/2017 10:55 AM

Giygas wrote:

How would 14/52 be for MX? I’m debating on trying this ratio soon.

13/48 is 3:59 gearing vs.14/52 3:71 gearing. I don't think you will see much difference. 14/53 is 3:79 but you might end up with clearance issues. You get 3:85 with 13/50 gearing and 3.77 with 13/49.
I have a 17 and everything I've seen says a slip on works wonders.

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The older I get, the faster I was.

12/12/2017 2:49 AM

Any one have feedback on slip on or full system from FMF, Pro Circuit or Bills Pipe?

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12/12/2017 3:30 PM

Mike 13 wrote:

Any one have feedback on slip on or full system from FMF, Pro Circuit or Bills Pipe?

I’ll have feedback soon on an FMF slip-on for my FC450.

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12/13/2017 5:27 AM

+1 on FMF 4.1 Titan Slip-On, bottom end is much better(this was on 17 450 SX-F) than stock.

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12/13/2017 8:32 AM

Tokyo mods were providing free remap with pipe purchase.

I would go for the full system since it solves other issues.

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12/13/2017 8:42 PM

Adjust the tps to .620mv. Probably set to lean from the factory. KTM/Husky I have checked is set leaner than ideal.

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12/14/2017 9:43 AM

endurox wrote:

Adjust the tps to .620mv. Probably set to lean from the factory. KTM/Husky I have checked is set leaner than ideal.

Wow, that's a huge jump from the stock setting of .520. Did you make that adjustment on the stock bike or after a pipe and airbox holes?

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The older I get, the faster I was.

12/14/2017 12:19 PM

First install the second throttle cam that comes with the bike (at least on KTM). That is like re-gearing it. Dont understand how people can ride without it.

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12/14/2017 1:40 PM

Tokyo mods say not to mess with the tps since just moving the idle changes that setting

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12/14/2017 6:22 PM

endurox wrote:

Adjust the tps to .620mv. Probably set to lean from the factory. KTM/Husky I have checked is set leaner than ideal.

captmoto wrote:

Wow, that's a huge jump from the stock setting of .520. Did you make that adjustment on the stock bike or after a pipe and airbox holes?

Yes it is a big change. Cusotmer's bike runs cooler now and pulls way better. Stock setting had to rev bike up a bit or it would stall.

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12/14/2017 8:24 PM

Cheers for the replys. Im going order a fmf slip and run 14/52. Ill see how that goes first before remapping. Ive never owned an aftermarket pipe, always ran stock but wouldnt be a bad idea having a spare exhaust if i crash at race.

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12/14/2017 8:27 PM

Heres a photo. Im not a huge fan of stickersPhoto

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12/14/2017 9:12 PM

captmoto wrote:

13/48 is 3:59 gearing vs.14/52 3:71 gearing. I don't think you will see much difference. 14/53 is 3:79 but you might end up with clearance issues. You get 3:85 with 13/50 gearing and 3.77 with 13/49.
I have a 17 and everything I've seen says a slip on works wonders.

13/48 is *3:69 gearing vs.14/52 3:71

http://www.chaparral-racing.com/blog/2011/04/25/adjusting-your-drive-ratio-changing-your-sprockets-for-maximum-performance/
(Only used the Chaparral link since it has a J-Law pic cool )

14-52 helps most for the decreased chain torque properties. Have also heard good things about a slip-on to wake the Husky's up, but a full system eliminates the flawed OE two piece tight fit.
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12/14/2017 9:35 PM
Edited Date/Time: 12/14/2017 9:36 PM

Giygas wrote:

How would 14/52 be for MX? I’m debating on trying this ratio soon.

captmoto wrote:

13/48 is 3:59 gearing vs.14/52 3:71 gearing. I don't think you will see much difference. 14/53 is 3:79 but you might end up with clearance issues. You get 3:85 with 13/50 gearing and 3.77 with 13/49.
I have a 17 and everything I've seen says a slip on works wonders.

crc245 wrote: 13/48 is *3:69 gearing vs.14/52 3:71

http://www.chaparral-racing.com/blog/2011/04/25/adjusting-your-drive-ratio-changing-your-sprockets-for-maximum-performance/
(Only used the Chaparral link since it has a J-Law pic cool )

14-52 helps most for the decreased chain torque properties. Have also heard good things about a slip-on to wake the Husky's up, but a full system eliminates the flawed OE two piece tight fit.

I found 14/52 on my 450sxf made me not shift as much. I basically only used 3rd and 4th, not matter what the track. Always ran my rear wheel as far back in the swingarm aswell. Could be a myth but i think both things helped my rear suspension work better.

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12/15/2017 2:34 AM

I say it again, Mount the quick turn throttle csm before trying anything else. I ran 13-49, and had to go back to 13-48 with that cam.

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12/16/2017 4:23 AM

All I’ve done is a dr.d slip on and the bike wheelies out of every corner. Don’t think these bikes lack any power.

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