Rev Max Rev Box [obs]

Rev Max Rev Box [obs]
Rev Max Rev Box [obs]

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Description See Also: 17 Reviews 24 Questions
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17 Reviews
3.0 out of 5 stars
5 Star   7 4 Star   2 3 Star   1 2 Star   0 1 Star   8
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All Reviews
Bc canada
Durability 1/5 Ease of Installation 5/5 Performance 4/5 Power 4/5 Style 5/5
Kfx 400

Love the adjustability and power out put was great with all my other mods on my 2003 Kfx 400,but it only lasted a summer then it became hard starting and over fuelled the engine thought it was carb issues,back fire with flame out the pipe a new battery had helped but I installed the oem rev box and would rather it be reliable than extra powerful.if you got money to waste then I'd give it a try but don't throw the oem box out!!

Erie, PA
Durability 5/5 Ease of Installation 5/5 Performance 3/5 Power 3/5 Style 5/5
Not Bad

Have not noticed a huge difference, although it does rev higher, seems like it has a little more top end now, but my friends wont race me :-)

Rev Max Rev Box [obs]
Spartanburg S.C.
Durability 1/5 Ease of Installation 4/5 Performance 1/5 Power 1/5 Style 2/5

I purchase this rev box for my 05 trx450r. It only lasted for 4 hours. After that my quad would not start at all. I put the stock CDI box back in and it fired right up.....DONT WASTE YOUR MONEY ON THIS ONE!!!!!!

Durability 1/5 Ease of Installation 3/5 Performance 1/5 Power 1/5 Style 1/5


Durability 1/5 Ease of Installation 5/5 Performance 1/5 Power 1/5 Style 3/5
Absolute garbage

this box is junk, after i put it on my bike was a real pain to start so i fig carb probs, nope rev box. i put a spark tester on it and it's a very faint weak spark, put the stock box on real bright spark. DO NOT BUY THIS PRODUCT IS GARBAGE

souper33 Top 1000 Contributor
seneca new jersey
Durability 5/5 Ease of Installation 3/5 Performance 5/5 Power 5/5 Style 5/5

this little box will do soooooo much good for your quad..i put this on my yfz and it pulls harder now. deff will recomend to buy this after a pipe upgrade. just makes things so much better

Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 4/5 Style 4/5
Great deal!

I got this for my crf 150f and it works great! Very easy to install, does increase the rev limit to a decent extent, and has a tiny bit more throttle response. Gave my bike a good over-rev for coming out of corners, because my bike doesnt have the best low end punch its good for keeping the engine in high rpms.Great buy for $60!

Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Best bang for your buck

I bought this for my crf 50 and this thing works i can feel that my bike got more throttle response and alot more top end. I didnt have any problems with it eather the first kick it was started. This is a very good product

gulfport, ms
Durability 5/5 Ease of Installation 3/5 Performance 5/5 Power 5/5 Style 5/5
A 5 minute upgrade

A snap to install and started right up . Increases the upper rpm's. Only thing different is that it is a different size than stock so it may bounce around a bit.

Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
I Love this thing!

I bought this for my bike to give it a little extra juice and boy did it! i dont know why every one else had problems with theirs but i installed in no time plugs right in started right up with no problems and runs like a scalded ape!would highly recommend for anyone riding trails or something like that.

Don't buy

This product sucks I bought it for my crf450r the thing is fine 1/4 thottle after that its junk 1/2 thottle to wide open the thing is worth less don't buy it makes your motor run like junk. My motor ran great BEFORE I put this rev box in!!!!!!!


this thing is horrible when i put it on my bike and tryed starting it nothing happend so i figured it was my battery but no the box caused my fuse to blow so i tryed it againand it blew another fuse i put the stock on back on and it starts right up. somone tell me why or i rate this thing junk

new fairfield,CT
Good product

it was a good product but it was a pain to get it in but it was worth the trouble

Sherwood, OR
Rev max rules!

My 2002 XR400 had a flat spot in the bottom end. I installed the box, which took all of about 30 seconds. It now starts easier, and the flat spot when I gun it at low r's is gone!

New Waverly, TX
Big Power Increase

I was hesitant to buy this product becasue of the past reviews. I own a TRX450 and a CRF450 and bought one for both. I was very concerned because when I first installed it on the TRX450, it took forever to get it to start. Usually this bike startes on the second kick. After about 20 kicks, it started and I rode it for an hour. WOW !! it was like night and day especially with a difference in second and third gear. Now it starts normally just like before. I can't explain why it worked like that, only that is how it worked. For the CRF450, same install and start proceedure, but OMG the throttle response was off the charts. I had a buddy ride it for review as well because he has rode my bike a lot in the past and he was more impressed than I was !!

2004 CRF450R
Brockport, NY
Not so good product

plugged it into the bike (kx250f) and the bike would not run... plugged back in the stock ignition and it started first kick, may just be a faulty unit but im not sure.

crfracer74 Top 500 Contributor
Twin Falls Id
Good Buy

This product worked very weel with the powernow valve. I also had a fmf 4.1 pipe on, the bike was smoother and more tractable.

24 Questions
Answered:   24
Not Yet:   0
Top 1000 Contributor
Location: seneca new jersey
Q: Uhhmmm??
Over 7 years ago
could this ev box ake my radiator fan not work bc as soon as i put this thing on it wont work jw?
MotoSport Staff
Over 7 years ago Location: P+RTLAND
A: Haven't heard of that issue before. Have you tried putting your stock unit back on and see if the fan turns back on? If the fan turns back on with your OEM unit, give us a call and we will see what we can do with that rev box.
Q: Will this rev box help my 03' CRF150F?
Over 7 years ago
I've got as much power out of this bike as i can and I'm looking for more. Will this rev box help me at all?
Over 7 years ago
A: yes this will help. it will feel like you got a extra exhaust back there, alot more bottom end an mid range power and u can gain extra speed. and also u can gain between 750-1000 rpm's depending on what u have already done.
Location: Cromwell, IN
Q: Which is better for my 03 400ex, big gun or hi rev rev box?
Over 7 years ago
I bought a rev box for my 2003 400ex from honda dealer last month. Great throttle response, but i tried my buddys White Brothers rev box on my quad & WOW! Torque everywhere! Im very disapointed with mine now. Need more power. Which has more 2 offer? By the way Whte Brothers went out of business!?
MotoSport Staff Expert
Over 7 years ago Location: Portland, OR
A: I would recommend the Big Gun Rev Box over the Rev Max:;TRX400EX;2003&

Also WB did go out of business.
Q: How does this rev box effect an 08 yfz 450?
Over 7 years ago
Was it a great mod? Any problems with it? Answers please i would appreciate it. thanks
Expert MotoSport Staff
Over 7 years ago
A: This allows you to rev the motor further than the stock CDI box. which means more power.
Q: Should i.....?
Over 7 years ago
should i put a rev box or rev max on a honda crf230f because i dont want something to happen like not start but i want the power out of it
Over 7 years ago Location: Davenport,IA
A: I wouldn't the thing is junk on the top end of your motor. I was thinking the same as you a little more power. I would spend your money on something else. jet kit, stage 1 hot cam, bigger back spocket. Anything but the rev box. And if you do try it save your receipt. It cuts out your motor on top end.
Q: What will be better for my xr 70 the rev max rev box or the bbr rev box?
Over 7 years ago
which will give me better rpm's , and wound i have problems with it?
MotoSport Staff Expert
Over 7 years ago
A: I would opt for the BBR rev box. Just for the simple fact they specialize in mini's bike parts.
Over 6 years ago Location: dennisport
A: BBR Rev Box, Def Gave My Bike Rev Out More
Location: Lewes, DE
Q: If this product only increases the rev limiter and doesn't remap the fuel or ignition, than do I need to do it myself by adjusting my TFI box?
Over 7 years ago
and or should i get a spark enhancer to help if I do need to increase the fuel to make up for adding the extra rpm's?
MotoSport Staff
Over 7 years ago Location: Portland, OR
A: Since your bike is fuel injected it should automatically adjust to changes made by the rev box. A spark enhancer and remapping the TFI would be optional to obtain max performance but the stock unit should adjust enough to compensate for the added RPM.
Q: What is the difference between rev max and rev max 2?
Over 7 years ago
Top 10 Contributor
Over 7 years ago Location: Tualatin
A: the Rev Max is not adjustable as the Rev-Max 2 is adjustable, this version is very limited on applications
Q: Where does it go on a 2007 Honda 400ex?
Over 7 years ago
MotoSport Staff
Over 7 years ago Location: Portland, OR
A: Find you stock CDI box (normally under the seat or around that area) remove the stock CDI box and replace it with the rev max.
Location: Little Egg Harbor, New Jersey
Q: What is...?
Over 8 years ago
is Rev max better or BBR rev box better for my CRF80F???
MotoSport Staff
Over 8 years ago Location: Portland, OR
A: Both are good products and function pretty much the same as each other so it's going to be your pick over all. Personally I would run the BBR
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