5 free horsepower


42 replies to this topic
  • aford541

Posted April 08, 2004 - 12:03 PM

#1

I disconnected the Throttle Position Sensor today on my 04 YZ 450 F and the bike hawls the motor is stone stock except for a Power now and this mod. Thanks T dub

  • FFRacing79

Posted April 08, 2004 - 03:16 PM

#2

Now do the airbox mod! :)

  • Shane_Bettin

Posted April 08, 2004 - 05:18 PM

#3

how many 04 450s do you have?

  • aford541

Posted April 08, 2004 - 05:33 PM

#4

The air box mod is basically a velocity stack on the back of the carb right?
RHC said that the 04 CRF 450 carb flows better and is good for another 3 hp, then I can use the stock air box.
I have not even changed the pipe yet, these are unbelievable bikes.

  • aford541

Posted April 08, 2004 - 05:36 PM

#5

I had an 03 now have an 04 I'd like to have a 05 250 f have to talk to the wife about that though.

  • revolucien

Posted April 08, 2004 - 05:41 PM

#6

do you have a link to the Throttle Position Sensor mod you used... free hp is good

  • Satch0922

Posted April 09, 2004 - 03:00 AM

#7

Rev,

It's a simple mod.....just unplug the TPS. Cover both connectors and go ride!

  • yathump

Posted April 09, 2004 - 03:23 AM

#8

Hey Satch0922
Did you do this to your 426? How do you like the performance?

  • Satch0922

Posted April 09, 2004 - 05:05 AM

#9

I did it Sunday when I cleaned my carb. First "test" ride is today at Splendora!! I'll let you know how it works.

  • yathump

Posted April 09, 2004 - 05:16 AM

#10

Cool, are ya racing or just practicing?

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  • mx426

Posted April 09, 2004 - 05:57 AM

#11

Yeah, let me know when you get back too.

  • Sean_McCutcheon

Posted April 09, 2004 - 06:02 AM

#12

I have never heard of this mod. Where is the TPS located? What does it do?

  • Fly-nBri

Posted April 09, 2004 - 06:24 AM

#13

It's #52 in the pic.
Just unplug it at the connector and tape it off. Here's the link to the pic.
http://216.37.204.20...e=13&A=165&B=10

  • Mike88

Posted April 09, 2004 - 06:40 AM

#14

OK. I'm very new to 4-strokes and I often see posts that mention cleaning the carb. I have raced 2-strokes for years and didn't hardley ever clean the carb. Never had a problem either. Is this something unique to thumpers or just that I'm not accustomed to good preventative maintenance? Thanks.
Mike

  • SBK

Posted April 09, 2004 - 07:52 AM

#15

I have never heard of this mod. Where is the TPS located? What does it do?


Sean, big thread on it, including a dyno chart - here

  • beezer

Posted April 09, 2004 - 08:32 AM

#16

I have found the cleaner the gas going in is the less problems you will have.

I use auto body paint strainers.

A clean airfilter makes a difference to.

There is a drain and an access port to drain fuel. I wouldn't worry about it to much.

  • aford541

Posted April 09, 2004 - 09:45 AM

#17

This procedure is covered in another thread with a dyno sheet courtesy of tdub http://www.thumperta.../fpart/all/vc/1

  • sirthumpalot

Posted April 09, 2004 - 02:54 PM

#18

OK. I'm very new to 4-strokes and I often see posts that mention cleaning the carb. I have raced 2-strokes for years and didn't hardley ever clean the carb. Never had a problem either. Is this something unique to thumpers or just that I'm not accustomed to good preventative maintenance? Thanks.
Mike


The 4-strokes just seem to be very finiky and a dirty carb can make it run really really bad. The pilot circuits are small and get clogged easily. Some junk in the pilot jet had my bike cutting out, popping, spitting, was horrible at anything less than about 1/3 throttle. Cleaned the carb and presto good as new.

  • FearlessFreep

Posted April 09, 2004 - 03:46 PM

#19

newbi dumb question, is this mod only for 04s, how about my 03 :)

thanks in advance

  • revolucien

Posted April 09, 2004 - 05:30 PM

#20

ok i've checked the threads and looked at all the links people posted and, still don't see where this cable connection is. one of the threads says not to do it at the carb but hell, i'm not sure which that one is. anyone got a step by step with pictures for those of us that are a not as experienced with mod's.





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