Hersh Performance and Racing Products

09/17/2026

Enjoy the big cam 10vt chop noises.

Nobody has ever gone this radical with a 10vt

09/04/2026

If anyone scored some good photos of the dyno at Cruisers tonight, feel free to drop them here or PM me. Would love to add them to the website

Managed to run 20 bikes tonight including a mini bike from hell that tried to kill me.

What a fun night. Will be there in 1.5 weeks for the drags

09/02/2026

2 flashes and I have fueling nailed on this 2017 Yamaha R3.

Red is the stock flash, blue is my first tune, green is current. You can see how crazy rich it was before tuning.

Adjusting timing tomorrow and calling this one done.

07/20/2026

The harley guys are starting to show up for tuning. Let us know how we can help with yours.

This one had a decent tune up till 3500rpm where it goes lean. Getting it dialed in should produce good results

07/06/2026

Get a hold of Stephen at The RaceLineLLC to secure your spot. Not many left.

Will be bringing the mobile dyno out!

07/02/2026

Graphics are coming along nice. AI is amazing

06/19/2026

Just sharing what I managed to tune out of a completely stock 2025 CBR650R eClutch. The breakup on the high RPMS is due to the bike being mad about the front tire not rotating. Going to discuss with hardware manufacture about possibly being able to disable the safety features during dyno.

Bike consistently laid down about 80whp on many different runs in 100% stock form.

Tune-only managed to get about 2.3whp additional. Sprint Filter got me up to about 2.6whp. For comparison, this is about 20-25whp out of a modern day N/A car.

Bike definitely a bit more peppy and alive. Nothing to really write home about but all gears definitely feel more torquey.

Ran the graph through AI because I'm terrible at photo editing so ignore the obvious lazy addons

My CS Racing exhaust shows up this week so I will be running the data on that as well.

Most gains came from fueling adjustments. Bike runs fairly rich full throttle. Leaning it out gave the most gains. I found 0 gains from adding spark at WOT. More spark during light throttle gave a bigger effect and more throttle response.

If you are local to me in North Idaho and would like your bike tuned, feel free to reach out.

06/09/2026

We have a complete mobile motorcycle dyno setup now to serve the North Idaho / Spokane / Eastern Washington area.

Will be looking for outlets that want to host dyno shootouts, events, etc

Open for basic dyno runs and will be doing tuning as well

04/14/2026

Just came to my Attention that MaxxECU made us a dealer somewhat recently

Picture for proof. Let us know anything you might need

11/06/2025

Just in case you guys missed it

Got the 2.5L 10vt Stroker started over the weekend

first start after years of collecting parts and 1 year of assembling, machining, and engineering