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Applied Emissions Block-Off Kit
Applied Emissions Block-Off Kit

$45.95 - $49.95
Rating: 4.9 out of 5 stars

Select your bike to see if this smog block off plate fits



See Also:
Item #APP0008

17 Reviews

4.9 out of 5 stars
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  •   1 reviews
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All Reviews


Verified Purchaser
Over 10 months ago Eaton Rapids, MI
5 out of 5 stars
Expensive, but great mod

This is a very simple kit consisting of just a few very small components. Essentially it's everything you need in order to block off the emissions equipment on on your CRF250X. The kit came with everything needed (not a whole lot), and some basic instructions. The instructions themselves could have had better pictures and a little more detail, but the whole job isn't very complicated, so you'll figure it out. Other reviewers have said no performance increase was experienced, but that wasn't the case for me. I noticed an immediate boost in throttle response and it got rid of an annoying deceleration backfire and popping I was experiencing. To date, this is my favorite mod for my 250x.


Verified Purchaser
Over 11 months ago
5 out of 5 stars
A must for any motorcycle with emissions pump

Totally new motor with the emissions block off kit. Can’t believe what the state of CA makes the rest of us try and live our lives at a lesser level. Your bike won’t won’t run like it should unless it is removed.


Verified Purchaser
Over 11 months ago Seattle, WA
5 out of 5 stars
2017 CRF450x game changer

purchased bike new and was having nothing but problems with starting bike and in general it ran like garbage. Installed this kit very quickly and it was noticeably better just starting and idling after riding it was confirmed this fix worked wonders. I highly recommend doing this modification before anything else.


Verified Purchaser
1 year ago Vancouver BC Canada
5 out of 5 stars

Took all of 15-20 mins to take out the factory emissions and install the block off plates. Now I can see the engine


1 year 8 months ago USA
5 out of 5 stars
Worked better then advertised!

2009 Honda CRF-250X:
Install: The directions were not very good and a bit hard to follow. With a few minutes for rereading I was able to install the kit no problem. The parts looked just a shown and fit like a glove.

Difference: I'm 280 LPS of fat, I noticed a HUGE difference in the low range and torque. I have an after market FMF pipe and when coming down from higher RPM's I would get alot of back fire and sputtering. This mod made all that go away.


Verified Purchaser
1 year 8 months ago Arvada, Colorado
5 out of 5 stars
Easy install and used on Crf450x

Bought for 2012 with smog pump still on the bike. Follow directions and easy install. I also opened up the air box (cut to off, no side vent cuts), installed DJ jetting kit, flex fuel screen adjuster and a FM q pipe. The decel popping went away and gave the bike more power. The fuel screw did not seem to make a difference to jetting until I removed the smog pump. It was worth the cost as did not need to spend hours making a block off kit. I had it installed in about 30 minutes (but already had the bike apart to mod the airbox and put in a stiffer rear shock spring. Looks good too!


Verified Purchaser
1 year 11 months ago Phoenix
5 out of 5 stars
Worked great!

I have had this on for a few months now and had no issues. Installation was pretty simple and allowed me to shed a few pounds by getting rid of the emissions equipment.


Over 3 years ago Chico Ca
5 out of 5 stars
Great product

Was debating on whether or not I needed this kit as it does not increase horsepower at all, but soon found out it was well worth it, makes working on the bike much easier and it gives it a much cleaner appearance. Instructions were great too


Verified Purchaser
Over 4 years ago Alamo, NV 89001, USA
5 out of 5 stars
Great product

Nice to get rid of that useless air induction system.


Verified Purchaser
Over 4 years ago North downtown Grays, SC
5 out of 5 stars

I read a lot about cost. the directions are straightforward and it goes right on. If you can not pay you can not afford to play. It is a great little product.

4 Questions

  • Answered:   4
  • Not Yet:   0

Question asked by Curt2029

Question: Should I do the “optional”  transmission breather/vent mod in instructions?!
Question asked 4 months 12 days ago
Question answered by Paul
User's contributor status: Top 1
Question answered 4 months 12 days ago
Answer: If the instructions for the Applied Emissions Block-Off Kit on your specific motorcycle suggest the transmission breather/vent mod, we highly recommend it.

Question asked by CFR450x_Noob

Question: If I install this then decide to make my bike street legal will it not pass emissions? I live in Washington State.
Question asked Over 12 months ago
Question answered by Paul
User's contributor status: Top 1
Question answered Over 12 months ago
Answer: To provide you with accurate information, we will need to know the year, make, and model of your motorcycle.
Since you live in Washington state, can you you tell us whether or not Washington requires emissions testing for motorcycles?

Question asked by troyty349

Question: Does this come with the plugs for the airbox?
Question asked Over 4 years ago
2009 crf250x Does this come with hoses and vents also or will i just keep the old hoses on?
Question answered by MotoSportExpert
User's contributor status: MotoSport Staff Expert
Question answered Over 4 years ago
Answer: Yes the emissions block-off kit comes with all of the necessary plugs, screws, and fittings. For more info and possibly instructions I would contact Applied at 1800-853-0555.

Question asked by Adam

Question: Emissions Block Off
Question asked Over 6 years ago
After installing my Emissions Block Off Kit... Do I need to do anything to my jet system? I have a Honda 250x 2005
Question answered by rockandride6
User's contributor status:
Question answered Over 6 years ago
Answer: I found that it did lean the bike up a good bit, but adjusting the fuel mixture screw was enough for me. Note that I do NOT have stock jetting as I rejetted after exhaust.
Question answered by MotoSportExpert
User's contributor status: MotoSport Staff
Question answered Over 6 years ago
Answer: As long as your bike is currently jetted correctly, your 2005 CRF250X will not require re-jetting.


See all bikes that this part fits...

# Part Numbers

Product Variant Manufacturer Part #
Applied Emissions Block-Off Kit 4030, 5169, 5398, 5706