“I’ve been running Apex heads with the SX dome on my two yz250s for the past season and I must say I am pretty impressed.
The head gives me a noticeable power increase in bottom end into the mid-range. I race woods and occasionally moto and this head changed my engine into a luggable, torquey, four stroke like machine. When riding back to back with stock motors the difference is night and day. I can literally pull a gear higher in many sections/turns. I have not noticed any drop in power on the top end.
I did not need to make any jetting changes with these heads and have had zero issues with detonation even on 100% pump gas. The customer service you get from Matt is very personable and responsive to any questions I have had. The bang for the buck you get with these heads goes much further than any other motor mod I have used.”
— Nick Bryant (2005 and 2006 yz250)
“The Apex billet head with the MX dome was a direct bolt on, required no jetting changes or other tuning. I noticed an improvement right off the start, it came onto the pipe sooner and faster and felt like it never fell off. The head gave me a much wider power range to work with and easy to manage for a 20min moto. This head is deceivingly fast and easy to work with. The bike was a 2019 YZ250, Apex MX head, Boyesen Rad valve and a FMF Fatty with a Powercore2 silencer.
I’ve also now got about 30 hours on my 2017 YZ250 that has had the head machined by Apex Technical Innovations to the XC dome specs. The motor produces lots of low end torque and revs through the power range very smoothly, yet still having the ability to be lugged right down low. I’ve also noticed an impressive gain in fuel usage. 2017 YZ250, Apex XC head mod, Boyesen Pro Series reeds, Stock pipe with FMF powercore2 silencer and a GYTR offroad flywheel. ”
— Scott B. (2017 and 2019 YZ250)
“I’ve had some time now to put about 15 hours on this Apex Technical Innovations head on my beta (21 300 Race edition). I have to say this thing is awesome. Since 99% of my riding lately has been technical hard enduro I went with the XC dome to squeeze more grunt and low end lugability out of it. The biggest difference I noticed is improved power delivery. Especially on the bottom end to into the mid I could feel a pretty noticeable torque increase. So much so to a point where I’ll be changing my gearing to be taller since I can now pull taller gears. This has helped me in a lot of tricky spots where traction is key. The power curve feels VERY linear now compared to stock. If you are wanting some more lugging power and mid range the xc dome is the way to go! Apex also has an MX dome that gives a power increase more evenly across the entire powerband and an SX dome which turns the motor into a fire breathing monster. I’ve ran the SX head on my last two YZ’s, but the type of riding I’ve been doing has changed lately from mx/xc to hard enduro. A couple other things I noticed, the bike starts extremely quickly. Even more so than stock. The last 3 races I did I got the holeshot. The bike runs a bit cooler as well. The head visibly has much larger water jackets than the stock head. This is where the motor goes boom so the larger cooling capacity makes sense. Doing a lot of rock gardens and technical hill climbing my fan kicks on less often with the head. I have no issues continuing to run 93 pump gas with any of my Apex heads. The only jetting change I did was going in a 1/4 turn on the air screw. I needed to make this change previously anyways. If you’ve never tried a head before i would compare the power difference to double the performance increase you would get out of full exhaust system + reeds. If I had to choose between buying an aftermarket carb or a head I would much prefer the head. Plus id have a bunch of cash leftover that I could spend on important stuff like spoke coats and replacement horns. A pipe will move the power around and give you an increase in some areas but this is more noticeable. This is the best bang for your buck motor mod you can do to a two stroke ”
— Nick Bryant (2021 Beta 300RR)
“I finally got a regular ride day tune and test the new head, back to stock jetting and its dialed wow the bike felt perfect I was loving the day, me and a buddy on his beta 250 where equal. Feel like its exactly what I was hoping for I could hold 3 gear almost everywhere, I was really enjoying the ride, thanks again so much. Keep up the good work!”
— David (Beta 200rr, SXXC dome)
“Hey, I got to spend to time on the beta yesterday evening. I gotta say Matt you have done your homework here just like the yz. The Mxc dome has more torque down low, will lug forever. Places I was having to use the clutch a lot on 2nd gear before is no issue at all now. Mid-top is a major improvement also, soon as it comes on the pipe it just keeps pulling, before the power was flat on top. Definitely a major improvement over stock from bottom to top.”
— Anthony (Beta 300rr, MXC dome)
“This Apex Cylinder head felt almost like a displacement increase. More torque down low, more mid range and definitely a screamer on the top. My 14 year old rides it all day long on the weekends with no jetting changes, on 10% 93 ethanol pump gas. It seems to run very cool and consistent for an 07 with thousands of hours. Highly recommended for an easy, bolt on, very noticeable upgrade.”
— Darin (YZ85, SXXC dome)
“Matt at Apex has been great to work with and deal with. He has always been quick to respond to any questions I have had and addressed concerns for the custom dome he made me for his billet head.”
— Evan W. (2001 YZ250)
“Just got my Apex YZ250X head installed. I went with the XC dome insert. Great product! Detailed instructions! Fast shipping!”
— Justin M.
“I had my stock head recut to his xc specs and I absolutely love it. By far the best change I have made to my bike. The jetting was very easy to get dialed in and the bike runs much better. Throttle response and power are both greatly improved. More power everywhere, but also easier to control that power to find traction. I ride lots of single track 2nd and 3rd gear, plus lots of technical hill climbs. Apex has their sh*t together. You will not be dissapointed. ”
— Carl R. (2016 YZ250X)
“I had them cut my stock head to the XC spec and it works great in the woods! Well worth the $70.”
— Bob M. (2005 YZ250)
“These guys have some of the top of the line billet products for the YZ250 2 stroke with awesome prices to match. Thanks heaps.”
— Stephen T.
“First ride with the sx dome tonight and was impressed with the change in how the power was put to the ground. Lots more low end and a seamless midrange. I was able to stay with some guys on 450s that usually I’m just not on pace with. That’s from the added low and the fact that I could concentrate on the track and not putting the power down. I’m a vet pro and this is a great option for what I do considering I jump in the woods and do some arena x practice. My complete setup is pro circuit pipe and silencer, v force reeds, vp, and now the apex head. ”
— Scott P. (2019 YZ250)
“Matt at Apex is great to work with. I got my billet head with the XC dome installed on my YZ250X tonight. As some of you may know, the OEM head doesn’t clear the frame when trying to remove it on some bikes. The billet head from apex is machined so that it is easily installed and removed with no clearance issues. I’m a huge fan. The bike has much more usable power down low and a nice pull all the way through. Nice work!”
— Randy E. (YZ250X)
“I Went with the xc head for tough single track riding. I have noticed after the xc head install that the power is so much more smoother and controllable, = better traction. I can ride harder, faster, and longer than before also due to not getting as tired with the smooth power. I highly recommend Apex for your yz needs. Great costumer service and top of the line products at a very good price. ”
— Anothony H. (2012 YZ250)
“I can’t say enough great things about how well this SX/XC head works on my YZ125. makes more low and power as promised. easy bolt on and go. small jetting adjustment. highly recommended for vet riders having fun getting back into the sport and faster riders wanting a more tailored power delivery”
— Andy D. (YZ125)
“First of all their customer service is top notch! But on top of that, I got the xc head on my yz250 and it makes a huge difference. Moves the power around where you want it and makes it much more controllable than the typical on/off power the yz250s are known for. 10 out of 10 would highly recommend!”
