I had Ari build me an entire motor for my CRF300l. We spoke on the phone to figure out the build spec and he kept me updated as the head got ported and the bottom end went together. Then he shipped it across the country to me and I couldn't be more pleased with the power. It's everything I was looking for in this build. He was a true professional from start to finish, and I would highly recommend him for any mechanical upgrades for anyone looking to improve there bike's performance!

Almost 1k miles on this kit now and I am still blown away with the transformation every time I ride it. This kit completely transformed the bike into a different machine. I did the full stage 4 build with cams, intake, tune, etc and it pulls like a freight train through the full rpm range in every gear. It’ll now rev out to redline in 6th gear no problem. It absolutely rips on the trails and on the road. If you’re on the fence just do it you won’t regret it, I wish I did mine sooner!

Having bought the Honda CFR L Rally strictly for the street, my first opinion was great bike, handles well , super light and fun to ride. The problem was it felt under-powered. I researched the Web and came across Ari Henning’s fix. After talking to Ari, we decided the Big Bore kit, Airbox mod and CBR Cams would transform this little guy into what I was looking for. Couldn’t have been happier with the results and the professionalism of Ari. He did all the work (we live in the same area) he told me how much it would be and delivered what he promised. The bike is really much more fun to ride now and the parts transformed my little Honda into a kinda scary bike. 90 MPH on the freeway, on a little dirt bike is exhilarating!

After riding big ADV bikes for a few years I opted to build a small ADV bike for BDR type rides and went with an Ari Henning big bore kit. Every time I ride it I chuckle at how FRIENDLY and EASY to ride the bike is. I have put 3500 miles on the big bore kit tackling NM, UT and CO BDRs, which includes technical riding like Lockhart Basin in Moab and Black Bear Pass in Colorado. Most of my riding has been above 8,000 feet (and as high as 12,000!) which saps a bike’s power, but the 301 works great. I see this bike being in my fleet for years to come. Kudos to Ari for finding the right recipe on this one!

Since it was released I have been developing my CRF300 Rally into the ultimate light weight adventure bike and documenting it on my YouTube Channel: Shonky Productions https://www.youtube.com/@ShonkyProductions.

It has taken me on many great adventures throughout Australia but I always wished it had a little more horsepower and a little more torque for both off road work and highway performance. When I heard that Ari had developed a big bore kit for the CRF300, with his years of experience racing the CBR300 (same motor), I was confident it would be reliable and wasted no time ordering a kit.

The kit came with everything needed for the conversion and I was very impressed with the quality of the components. After installing the kit and a matching tune from 550 Performance I was immediately impressed. Not only had my prayers for more power and torque been answered but the smoothness of the motor had not been altered, an issue on some big bore kits with oversized pistons.

The bike was now more responsive and fun to ride with the added bonus of being able to pull taller gearing, thanks to its increased torque. The taller gearing lowered my revs on the highway while still having power to overtake and made the bike a much nicer “Adventure bike”.

I have been running the 301cc big bore kit for a year now and have put over 10,000km of abuse on it without any issues. In my view this is the best modification to increase power and torque, and I have tried them all. Check out my videos on the 301cc kit and see for yourself. It’s a big thumbs up from me.

Sean

https://youtu.be/7z-LOx6IcfY?si=V4s28FP8UyVYylWY

I had the privilege of working with Ari Henning, a record-holding racer with tens of thousands of miles under his belt as a testament to his expertise and reliability. Not only did he sell me the big bore kit, but he also installed it, complete with a CNC ported head, upgraded cams, air box modification, and professional tuning. The results are exceptional. The engine delivers significantly more power across the board, with a noticeable improvement both at low RPMs and as the revs climb. Ari’s extensive experience, particularly with this series of Honda motors, is evident in the quality of his work. His knowledge and craftsmanship make this investment well worth it. If you're considering a bulletproof build, don't hesitate—Ari's proven expertise ensures outstanding results.

I have 2 motorcycles that started out as stock 2021 CRF300L Rally's. The first one I purchased new and built it up with Ari's 301cc kit. Right after it was broken in, I left for vacation doing the WY BDR, Red Desert BDR-X, and the Black Hills BDR-X. The bike performed perfectly, great power off-road and on on-road, even fully loaded with a Mosko Moto Reckless 40L setup and full moto camping gear. I was riding with 2 others that had T700's, there was no problems keeping up off road (even leading the way with a lighter and more nimble bike) and on road I wasn't too slow either.

Even before that trip I was talking to Ari regarding the tuning of that engine as I went with a custom tuner in the Dallas TX area. I found out that he was in development of a 316cc kit. I knew I wanted that for my 2nd bike. I have adult son's and wanted them to be able to come with me on some adventures along with my other riding buddies.

I made plans to travel to the Long Beach CA area and have Ari build the engine with the 316cc kit and new head with 2mm oversize intake valves and everything else. I even had a Rekluse TorqDrive clutch pack installed in it. Ari's shop rates were reasonable and competitive. He provided updates as he went though the build and even he was impressed by the rest of the build on the bike. His attention to detail showed in all that he did. He even chased a few threads that were in need of that on the body bolts.
Ari did the proper break-in of the motor as part of his service. And the motor and bike put a smile on his face as he was able to wheelie it from 2nd gear to 4th
I recently did a 200 mile adventure day through the Big Bend area of TX. The run on FM170 was a blast. The ride into BBRSP to the Solitario was a blast. The bike handled the TX desert just fine. Fuel economy was still good as about 67mpg's for that day.
If you look at the total cost to either upgrade the CRF300L Rally to make it into the mythical unicorn do all you want it to versus starting out at a higher price point of a different bike and then spend to make it fully adventure ready, I think the value of upgrading the CRF300L Rally is still a wise choice, and have done so with my money twice

I ordered a big bore for my crf300l, tried installing it myself but had nothing but issues. Ari was working with me very closely to try and figure it out but every single time I’d fix somthing a new issue would appear. I decided to just ship the motor to him and have him fix it. He sent me a photo on how to pack the motor and it was super quick and easy. I had absolutely 0 problems shipping it there and receiving it. He ended up throwing on a whole new big bore along with resurfacing the head. He was sending me photos and showing me what he found throughout the entire process. It only took him 2 weeks to get everything done and ship it back out. Since throwing it back in, I followed his break in procedure and just been ripping it having 0 issues. From talking to him I’ve learned that he’s been working with this engine platform since 2011 so he knows absolutely every little bit about it. I thought shipping my motor off to get fixed would be this big hassle and take a long time but Ari made it super quick and easy to where it wasn’t even a thought in my head. Can’t express how happy I am with his service.

I had a CRF250L that I wanted to convert to 300. I'm pretty mechanically inclined but didn't feel comfortable splitting the cases to change the crankshaft. Ari built me just a 300L bottom end so that I could change all of my parts (clutch, rotor, etc) over to it. He had it built and shipped in just a few days! Def recommend working with Ari because he knows the motors so well and is able to provide whatever you need.

My journey started with a CRF250L Rally. I was already impressed with the basic Rally, the right size, weight and on/off road handling. But as you all know, it could be better. Suspension was sorted for my weight and then came time for the engine. First, the 286 (CBR300) crank to make it a CRF300L. This was a noticeable increase in flexibility if not outright power. Breathing mods (exhaust and intake) came next followed by the 550PERFORMANCE.COM stage 1.5 ecu.
While all this work increased my enjoyment of the bike and improved its road capabilites, I knew it wasn't quite the best it could be.
Ari Henning's 301cc big bore kit is the icing on the cake.
The stage 3 tune (in conjunction with the 550 Performance ecu) is powerful, flexible and to my way of thinking, has made my CRF301 perfect.

Ari and Maverick worked closely with me to ensure my unique setup (ex CRF250L) was customized correctly and they went out of their way to minimize shipping costs to NZ for my custom parts.

My day job is an Airplane mechanic, I am aware of other kits but wanted to ensure that any mods would be effective and very importantly, reliable. Ari's kit is well thought out using very high quality components with the right balance of performance and reliability. I delayed writing this review to put 1000 miles on the clock to confirm the above and am really pleased to be able to recommend the kit without reservation. Great work Ari,
my Honda is fantastic

Ari comes through everytime

I had a lot of questions and Ari answered all questions, very helpful. If you’re on the fence about purchasing this kit, it’s well worth it. You won’t regret it. Definitely makes the bike a lot more fun.

Thanks!

I love the extra power of the 301cc BB kit. This is the way the bike should have come from the factory.It will now do a power wheelie in 3rd gear. The bike is way more responsive thru all gears and will also pull the top gears like it should. I haven't had any issues with the bike in 2000+ miles with the kit installed.

Made the little 300cc into an an actual 300 plus some! Improved performance and even sent the piston pre-installed! Thanks for the great kit!