FMF PowerCore need suggestions


28 replies to this topic
  • Matty05

Posted April 20, 2006 - 03:38 AM

#21

Ok thanks for the info. I was reading the instructions and the instructions said something about making sure all bolts and CLAMPS were tight and the only clamp was the OEM one I removed with the stock pipe. So that kinda confused me. :thumbsup:

Probably generic instructions. :thumbsup:
Some of their pipes have straps or clamps to hold the muffler at the rear bolt hole.

  • CALVIN_KLEIN88

Posted April 20, 2006 - 07:02 AM

#22

How much of a re-jet did you guys need when you went to the aftermarket exhaust systems? I'm getting ready to upgrade too and am curiouse what all is needed.

  • YamahaWR450FMike

Posted April 20, 2006 - 01:22 PM

#23

I haven't had a chance to ride my WR450 with the new Powercore yet. Just started it up and it sounds very nice. I will report back with my experiance with the new pipe at the end of this weekend.

  • Terrain Rider 4z

Posted April 20, 2006 - 02:13 PM

#24

I use the clamp on my PowerCore and everything is fine.

If you ride off road do not remove the spark arrestor. All we need is bad press from someone running around without a spark arrestor when a forest fire starts. This does happen!

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  • Gadsen

Posted April 20, 2006 - 03:21 PM

#25

How much of a re-jet did you guys need when you went to the aftermarket exhaust systems? I'm getting ready to upgrade too and am curiouse what all is needed.


I did do the JD kit, but not because of the new pipe, just wanted to upgrade. Never ran the PC4 witht he stock jetting. Oh, get the extended fuel screw also.

  • Gadsen

Posted April 20, 2006 - 03:22 PM

#26

Probably generic instructions. :thumbsup:
Some of their pipes have straps or clamps to hold the muffler at the rear bolt hole.


Yes, mine had the strap with a rubber insulator. Much better than the tab that breaks off with vibration.

  • Matty05

Posted April 20, 2006 - 04:59 PM

#27

Yes, mine had the strap with a rubber insulator. Much better than the tab that breaks off with vibration.

I have read a few times and even in mags that the strap is what breaks? :thumbsup:

  • Matty05

Posted April 20, 2006 - 05:15 PM

#28

How much of a re-jet did you guys need when you went to the aftermarket exhaust systems? I'm getting ready to upgrade too and am curiouse what all is needed.

I had to spend a fair bit of time rejetting my bike, but you will learn what everything does in one day.
Just change one thing at a time untill you can really diagnose what is going on.
The more free flowing the pipe, the more sensative jetting becomes.

What model you got???
If you have an '05+ Get a GYTR AIS block off kit to start with, it comes with adjustable needle and the 48 pilot jet you need. Then get an adjustable fuel screw at the SAME TIME. It is invaluable. Get 168 and 170 main jets, as 165 is stock.

The ultimate jetting kit:
http://www.ziptyraci...spx?id=MTEwOA==

  • CALVIN_KLEIN88

Posted April 21, 2006 - 07:41 AM

#29

Right on. I have all the usual mods done and already jetted in that ball park. The yosh guy said all I would have to do is bump up one size on the main but that sounded too easy... Appreciate the info.




 
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