Cherry red FMF power bomb normal?


8 replies to this topic
  • bradc-wr450

Posted February 22, 2006 - 08:00 AM

#1

Has anyone else seem their FMF Power bomb header glow? I have all the "free mods" done at this point. Also have PowerNow and PowerNow plus installed. Currently running the stock silencer and stock jetting... changing that later today. Gas is pump supreme, not race gas.

The pipe glows red when I warm up the bike and the color changes as you hit the gas. At idle it's just kinda dark red but when you rev it up it makes the pipe glow RED up to the bend area (under the corner of the radiator which is of concern).

Not sure if this is normal or if the bike is running really hot. Thanks for the input.

  • bradc-wr450

Posted February 22, 2006 - 08:08 AM

#2

Guess the bike info is important... 04 WR450

  • rich1167

Posted February 22, 2006 - 08:26 AM

#3

Sounds like the jetting is lean. Stock jetting is lean. If you haven't changed it from stock you need to. Check the sticky jetting post at the top of this forum for someone in a similar location as a starting point for jetting.
Although I have never experienced a glowing pipe on my 450. I have seen others post of this occurring with extended sitting and idling. My sons 250 was doing it when we brought it home. I found that the pilot jet was plugged.

  • rockieman

Posted February 22, 2006 - 08:38 AM

#4

You can probably do a search on every forum and find similar posts to this. Very common :thumbsup:

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  • bradc-wr450

Posted February 22, 2006 - 08:43 AM

#5

Thanks for the tip. The elevation in Boise is around 3000' and the mountains we ride in range up to maybe 6000-7000'. The temp is the thing that changes so much over the course of the day. Not wanting to do jetting mid day everytime I ride. I like top performance but will settle for something that runs strong at all elev and temp and requires no real attention. I have friends that are constantly "tweeking" their system and it gets old...

going up in the main and pilot today. Also going to see if I can find a Zip ty in town since I have a little race this weekend in the desert...

  • rich1167

Posted February 22, 2006 - 08:51 AM

#6

We ride about the same elevation here. For the temp this time of year. My set up is:
170 main
JD Blue #3
48 pilot
1.5 turns out
0 leak. I soldered one shut.
The bike rips.
I don't like to fiddle around with it all of the time either. I run a summer and winter set up.

  • yamahacrazy_310

Posted February 22, 2006 - 09:03 AM

#7

yes my header does it to my friends 05 yz250f does it my other friend has a 450 and a 250 and they do it to its normal

  • bradc-wr450

Posted February 22, 2006 - 09:14 AM

#8

Hey do you adjust for the FMF and PowerNow stuff? The post info for jetting has elev and temp but says nothing about pipes, powernow, etc... do you adjust your jetting a little richer to compensate for that?

  • rich1167

Posted February 22, 2006 - 09:42 AM

#9

My jetting is with the stock pipe with the plug out and some of the inner baffles removed and air box mods. I am running a little richer then Indy's chart recommends. Here is his chart.

Here is what works for me and you guys can use it as a starting point to jet your WR450 bikes only!

(Note: do not use these for WR426 or WR400 due to carb differences!)

This recommendation requires air box flow mods and an open stock or aftermarket pipe and ACV circuit intact.

Elevation 0 to 4,000. feet

30 to 45 degrees: 172 main, JD Blue #5, 48 Pilot, 2.0 turns, 75 starter jet, #0 leak jet
45 to 60 degrees: 170 main, JD Blue #4, 48 Pilot, 1.75 turns, 72 starter jet, #0 leak jet
60 to 75 degrees: 168 main, JD Blue #3 or JD Red #5, 48 Pilot, 1.5 turns, 70 starter jet, #40 leak jet
75 to 90 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 68 starter jet, #50 leak jet
90 degrees plus: 160 main, JD Red #4, 45 Pilot, 2.0 turns, 65 starter jet, #60 leak jet

Elevation 4,000 to 8,000 feet:

30 to 45 degrees: 170 main, JD Blue #4, 48 Pilot, 1.75 turns, 72 starter jet, #0 leak jet
45 to 60 degrees: 168 main, JD Blue #3, 48 Pilot, 1.5 turns, 70 starter jet, #40 leak jet
60 to 75 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 68 starter jet, #40 leak jet
75 to 90 degrees: 165 main, JD Red #5, 45 Pilot, 2.0 turns, 65 starter jet, #50 leak jet
90 degrees plus: 160 main, JD Red #4, 45 Pilot, 1.75 turns, 65 starter jet, #60 leak jet


Elevation 8,000 to 11,000 feet: ( Note you will loose a lot of power due to altitude but your bike will idle and not foul plugs!)

45 to 60 degrees: 165 main, JD Red #5, 48 Pilot, 1.25 turns, 70 starter jet, #40 leak jet
60 to 75 degrees: 160 main, JD Red #4 , 45 Pilot, 1.75 turns, 68 starter jet, #50 leak jet
75 to 90 degrees: 158 main, JD Red #3, 45 Pilot, 1.5 turns, 65 starter jet, #60 leak jet




 
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