POWER CORE IV 2 400ex
#1
I want to get a FMF Power Core IV 2 Slip-on for my 400ex. Should I get the spark arester version? Will I need to rejet? Do I need to get a Jet kit? How much horsepower will it give with just a slip on? Any tips would be appreciated. Thanks
00 trx400ex - ac mudscreen front bumper, nacs headlight covers
86 trx200sx - powersport bandit 20 in rear tires
http://www.geocities.com/cory_14/
00 trx400ex - ac mudscreen front bumper, nacs headlight covers
86 trx200sx - powersport bandit 20 in rear tires
http://www.geocities.com/cory_14/
#3
I am running the Power Core IV 2 also. You will need to jet your carb. I ran mine for 2 days without the jets. I DID notice a performance gain even without the jets even though it was running pretty lean.
I am using a Uni Filter with stock airbox and a 160 main with this pipe seems to run nice. Not rich or lean.
Eric
I am using a Uni Filter with stock airbox and a 160 main with this pipe seems to run nice. Not rich or lean.
Eric
#4
I was told by the people at Rocky Mountain ATV that I would probably not need to rejet with this pipe and my K&N. I have logged about 12 hours of hard riding with this pipe and I have never bogged down or hit dead spots. I don't plan on rejetting until I get the Power Bomb. I couldn't give you an exact horsepower gain, but it was VERY noticable. Blows the plastic off my buddies 400's with the MegaMax and the Big Gun. Unbelievable low end power and torque.
#5
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#8
if you do not make any airbox mods you do not need to rejet but i rejeted and but my airbox lid back on and between 3/4 and full (main jet time) i would bog.. That is because there was not enough airflow with my K&N and exaust flow... Wet plug.. Took off airbox lid and was flying... As for the RPM swing-arm and a-arms I paid 400 for the a-arms and 300 for the swing arm(actually I upgraded his computer). I know the guy that makes them for RPM So he hooked me up... I might be able to hook you up... My custom Stainless Steel braided brake lines are awesome too... www.rpmracing.com but there website is being made..
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Logan Collins
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09-05-2015 08:03 PM
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