18 FC450 more bottom end

JB479
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JB479
Edited Date/Time 12/16/2017 4:23am
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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calvinm48
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calvinm48 12/9/2017 3:39pm
12/9/2017 3:39pm
I drilled holes for my fc350 and seemed to be a bit better. Nothing crazy, other than dirty air filters
JB479
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JB479 12/9/2017 3:53pm
12/9/2017 3:53pm
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)
CarlinoJoeVideo
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CarlinoJoeVideo 12/9/2017 4:54pm
12/9/2017 4:54pm
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.
Bruce372
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Bruce372 12/9/2017 6:29pm
12/9/2017 6:29pm
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!

The Shop

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Bruce372
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Bruce372 12/9/2017 6:30pm
12/9/2017 6:30pm
I just went up one tooth on the back as well since it felt geared a little long
swtwtwtw
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swtwtwtw 12/10/2017 7:06am
12/10/2017 7:06am
14/52 is good. Install a black throttle cam from a 17.
Acidreamer
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Acidreamer 12/10/2017 7:28am
12/10/2017 7:28am
HC piston & cams. Maybe get a more aggressive remap. Turn the throttle more lol
BobPA
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BobPA 12/10/2017 7:55am
12/10/2017 7:55am
Remove the restrictor in the exhaust
Giygas
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Giygas 12/10/2017 10:05am
12/10/2017 10:05am
How would 14/52 be for MX? I’m debating on trying this ratio soon.
captmoto
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captmoto 12/10/2017 10:52am
12/10/2017 10:52am Edited Date/Time 12/10/2017 10:55am
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.
Mike 13
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Mike 13 12/12/2017 2:49am
12/12/2017 2:49am
Any one have feedback on slip on or full system from FMF, Pro Circuit or Bills Pipe?
Giygas
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Giygas 12/12/2017 3:30pm
12/12/2017 3:30pm
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.
needforspeed78 12/13/2017 5:27am
12/13/2017 5:27am
+1 on FMF 4.1 Titan Slip-On, bottom end is much better(this was on 17 450 SX-F) than stock.
Bruce372
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Bruce372 12/13/2017 8:32am
12/13/2017 8:32am
Tokyo mods were providing free remap with pipe purchase.

I would go for the full system since it solves other issues.
endurox
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endurox 12/13/2017 8:42pm
12/13/2017 8:42pm
Adjust the tps to .620mv. Probably set to lean from the factory. KTM/Husky I have checked is set leaner than ideal.
captmoto
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captmoto 12/14/2017 9:43am
12/14/2017 9:43am
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?
aees
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aees 12/14/2017 12:19pm
12/14/2017 12:19pm
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.
Bruce372
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Bruce372 12/14/2017 1:40pm
12/14/2017 1:40pm
Tokyo mods say not to mess with the tps since just moving the idle changes that setting

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endurox
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endurox 12/14/2017 6:22pm
12/14/2017 6:22pm
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...
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.
JB479
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JB479 12/14/2017 8:24pm
12/14/2017 8:24pm
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.
JB479
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JB479 12/14/2017 8:27pm
12/14/2017 8:27pm
Heres a photo. Im not a huge fan of stickers

crc245
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crc245 12/14/2017 9:12pm
12/14/2017 9:12pm
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...
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-ra…
(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.
JB479
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JB479 12/14/2017 9:35pm
12/14/2017 9:35pm Edited Date/Time 12/14/2017 9:36pm
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...
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:
[b]13/48 is *3:69 gearing vs.14/52 3:71[/b] 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 B) ) 14-52 helps most for the decreased...
13/48 is *3:69 gearing vs.14/52 3:71

http://www.chaparral-racing.com/blog/2011/04/25/adjusting-your-drive-ra…
(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.
aees
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aees 12/15/2017 2:34am
12/15/2017 2:34am
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.
mxer807
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mxer807 12/16/2017 4:23am
12/16/2017 4:23am
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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