DHMotoring

02/17/2025

Sometimes I forget how trick these actually are 🔥 MO Power billet cam cover breathers are back in stock!

12/13/2024

DHM Billet Drive Hubs are now in stock on the site!

12/10/2024

Found some time to put in to the Dax today!

Green is a bone stock line from a run this morning with the added O2 b**g so we can log AFR. The factory mapping is extremely rich in the mid to top end.

Red is a bone stock bike with our ECU flash. Corrected AFR, ignition timing, rev limit, injector timing, etc, etc. We saw nearly a 40% increase in power at the stock rev limit of 8,700rpm, which is amazing considering the bike has no engine modifications.

Blue is with a Kitaco JC92 intake installed. It smoothens out the power curve, loses a little mid compared to the stock tuned bike, but does exceptionally well above 6,400rpm holding decent power until the new 10,000rpm rev limit. With just this intake and our ECU flash, we see a 75% HP gain over the stock bike at 8,700rpm (67mph in 4th gear).

By extending the rev limit to 10,000rpm we bump the theoretical top speed from 67mph to 77mph without changing gearing. I say theoretical because it may not pull all the way depending on rider weight, riding conditions, etc.

We have a Yoshimura exhaust system inbound to test wtih, and once all of those maps are dialed in we'll throw an S1 cam in it and continue!

12/09/2024

Baseline Dax runs are complete. We’re seeing just about 8hp at the wheels (and only 5.5hp at higher rpm) there is a lot of room for improvement!

12/07/2024

Dax acquired! Dyno break in starts on Monday! Thanks as always ❤️

11/27/2024

We helped .0 put this motor package together for his minty OG back in 2018. 6 years later it’s here unopened for a health check and it still rocks and rolls. 147cc, big valve head, etc etc. We put a fresh tensioner, some new suspension and played around with the engine management and it’s now ready to rock again. Maybe we can drag him back out for the 2025 season!

11/19/2024

Takegawa 4v testing results!

So far the most impressive part of this kit is that it can rev to 11,500 without valve float. We currently cannot rev the stock 2v heads past 10,500 reliably for any extended periods of time without parts failure.
As far as the power goes, it's about what we expected from looking at the kit, considering the intake and exhaust ports are quite large for the displacement. This kit needs and wants to rev high like most other 4v kits.
At the moment the best run we've had by trying numerous different intake and exhaust setups is 16.29hp with a pod filter on the AvailMS ported Koso 34mm TB and the Brock's high mount exhaust. On average runs were right around the 16hp flat mark. We may explote portwork on the head to see if we can crack the 17hp but as it sits I think we can expect around 15-16hp consistently on an average bolt on setup with proper tuning.
Compared to our 149 kit with S1 cam and ported head, the Takegawa 4v setup makes more power above ~8750rpm but it does lose to the 149 at all RPMs below that. If you are the kind of rider always revving the bike then this kit will likely provide a higher top speed at the cost of mid range punch. Compared to our 149 with our S2 cam and ported head, the Takegawa 4v kit makes the same low end power but then falls short at all RPMs above 5,000rpm. The downside to our S2 cam is that it is a race part and requires valve spring replacements much more regularly.
The base kit from Takegawa includes the top end and cylinder head along with your exhaust gasket and spark plug. In our opinion in order for this kit to be reliable you'll also want an additional crankcase vent and an oil cooler. To run a cooler you'll need the Chimera filter block, a Kitaco side cover, or the Takegawa oil cooler kit since the valve covers on this 4v head do not provide oil flow like the stock head.
If there is demand we will develop an ECU flash for this setup and put together an all inclusive option like we have with our 149 kits. Pricing would probably be around the $2k mark including the oil cooler, fuel injector, crankcase vent and ECU flash service. As with our other comprehensive kits, you'll need to provide your own intake and exhaust, and we highly recommend the Brock's high mount and pod filter after testing so far.
Setup constants:
Takegawa 145cc 4v + R Superhead
Koso 34mm TB ported by AvailMS and manifold with AvailMS adapter
PCX Injector
aRacer MiniX + AF2
93 Octane
First Chart shows various intake/exhaust changes on the Takegawa setup:
Green Line: Chimera 34mm intake with Yoshimura RS9T
Blue Line: Pod filter on TB, Yoshimura RS9T
Red Line: Pod filter on TB, Brock's High Mount
Second chart compares to our 149:
Green Line: Takegawa 145cc 4v with Koso 34mm TB, Chimera 34mm intake and Yoshimura RS9T. 93 Octane.
Yellow Line: DHM 149, DHM ported head, DHM S1 Cam, Koso 34mm TB, Chimera 34mm intake, Yoshimura RS9T. 93 Octane.
Red Line: DHM 149, DHM ported head, DHM S2 Cam, Koso 34mm TB, Chimera 34mm intake, Yoshimura RS9T. 93 Octane

11/18/2024

Nastee Nate brought in this OG he was building using a Kitaco Neo 181cc long block built by The Speed Shop for a dyno tune on the stock ecu. End results were a healthy 19whp with a very usable torque curve 👍

11/08/2024

That’s a wrap for the 2024 season with ! 2025 prep starts soon 💪 If you have any interest in getting on track with us please reach out. All skill levels are welcome! 📷:

10/28/2024

The new Honda Grom high mount sits just right on our Monkeybike 🥰 Performance report and dyno data coming soon!

10/11/2024

Itching to get back at it next month with ✊ 📷:

10/10/2024

Thanks to everyone that checked in on us! We’re all good and will spend today helping our community clear debris. We will be back in the shop tomorrow morning!

10/03/2024

TBT to when we visited and to install the billet DOHC package in to the CRF for 2023 🔥

09/30/2024

Twilight cruising with

09/26/2024

Full recap of our race at the SFLMinigp Aaron Dreher Memorial 4-Hour Endurance event!

This was the inaugural Aaron Dreher Memorial endurace race and the second endurance race of the season with SFL MiniGP. We raced for 4 hours at Bushnell Mot...

09/19/2024

last weekend at for the sprint races. If you haven’t tracked your mini, you’re missing out 😎

09/11/2024

Throwback to the final event put on by our friends at Is the dirt on that shirt real or printed? 😂

08/14/2024

We’re back at for the 4-hour endurance race later this month! Spots are still open so sign up and come race!