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All 650's Intro to Dyno Tuning

motorider

2019
CBR650R ABS
May 6, 2021
Riding Since
1986
After reading the postings in the forum, I noticed there were a lot of questions related to performance tuning. So I decided to write this posting based on my experience tuning my own bikes and working with tuners at local shops. So you want to get your bike dyno tuned? Before you do, you need to prepare your bike and have a basic understanding of dyno tuning. This will help you get the best result for the time and money you will spend on tuning.

Mandatory Preparation (You can ask a shop to do the prep work for you)​

1. New oil and filter
2. New air filter
3. Fresh fuel with the octane level you use most often, do not fill your tank with 93 octane if you usually use 89. The fuel's octane is very important for the tuner to properly set the ignition timing.
4. PAIR valve removal (keep reading for explanation) - Kit by Smartmoto - https://smartmoto-electronics.com/c...-ple-206-en?moto_brand_id=2&moto_model_id=222

If your bike has lots of Miles/Kilometers on it, then there are additional preparation steps:​

1. New spark plugs
2. Valve adjustment

Terminology​

ECU - Engine Control Unit, an onboard computer that calculates the ideal amount of fuel to deliver to the engine
AFR - Air to Fuel Ratio, measures the efficiency of combustion of fuel, 14.7 AFR (1 Lambda) is complete combustion (most efficient). 14.7 AFR does not necessarily result in the most power. Tuners are typically looking for an AFR of 13 or 0.89 Lambda.
Lambda - A measure of air and fuel combustion (like AFR) but uses a scale based on 1.00 being the most efficient burn of fuel. On the Lambda scale, 1 = 14.7 AFR, less than 1 is rich and greater than 1 is lean.
PAIR Valve - Passive AIR Injection, injects air into the exhaust system to burn any unburned fuel. PAIR affects the accuracy of the wideband O2 sensor used in the tuning process. That is why the valve needs to be removed or blocked prior to tuning.
O2 Sensor - Measures the Oxygen level in the exhaust. A narrowband O2 sensor is what is installed on most bikes. Wideband O2 sensors are used by tuners to measure the AFR/Lambda because they have a larger detection range and can precisely measure the O2 content of the exhaust.
Open loop - A mode that the ECU uses when an O2 sensor is not being used to adjust the fuel delivery. Open loop mode is used at high loads (high rpms) and at WOT (Wide Open Throttle) to control the amount of fuel that is delivered to the engine. The ECU uses tables stored in memory to calculate the fuel delivery. Tuners will modify the tables to adjust the fuel delivery to produce the most power.
Closed loop - A mode that the ECU uses to dynamically adjust fuel delivery using data from the stock (narrowband) O2 sensor. This mode is used at low loads (low rpms).

Common Upgrades Done Prior to Tuning (A shop can install these for you)​

Akrapovic (or equivalent) full exhaust system - "full" means that it replaces the entire stock exhaust system including the header pipes. A full system improves exhaust flow and reduces backpressure.
K&N (or equivalent) air filter - reduces air intake restrictions

Types of Tuning​

To determine the type of tuning to use (piggyback or ECU flash), ask your local shop what they are most familiar with. If they use Bazzaz, then buy Bazzaz, if Woolich, then they may ask you to buy a Woolich license, etc. The point is, you want to go with what the shop has experience tuning with to get the best result. Also, don't bring your Honda to a Harley shop and expect a good result regardless of what the shop says. Tuners specialize in certain types of bikes, just ask them ahead of time what types of bikes they usually tune.

There are three types of systems that are used to tune with:​

1. Piggyback systems, e.g. Dynojet Power Commander, Bazzaz Z-Fi. These systems connect to the wiring harness and override the ECU's fueling, spark, and other settings.
2. ECU Flashing, e.g. Dynojet Power Vision, Woolich Racing, Mail in ECU flashing. ECU flashing completely overwrites the settings in the ECU's memory. With ECU flashing, there is no need to install a controller or external electronics.
3. Racing ECUs, these ECUs are not available to the general public and are typically only available to factory racing teams. Manufacturers have their own software to make changes to racing ECUs.

Finding a Shop for Dyno Tuning​

Talk to other riders in your area in a riding club or at a track day.
Check the dyno manufacturer's websites:
https://www.dynojet.com/dyno-tunings-center/motorcycle-dyno-center
https://www.mustangdyne.com/find-a-dyno/

Timeframe and Cost​

Tuning may take several days depending on the shop's workload, so plan ahead. Cost varies widely so I recommend contacting more than one shop.

Results to Expect​

After tuning, your bike should run smoothly from idle and throughout all rpm ranges. If it does not, contact the tuner or shop and tell them very specifically what is happening so they can remedy the problem.
Do not expect massive power gains compared to stock. Gains of 5 - 10 HP are typical. Power gains depend on the stock tuning (starting point) and the type of modifications that the bike has.
Depending on how aggressively you ride and whether you ride on street or track, you will notice more power, faster acceleration, and quicker throttle response.

Summary​

1. Prepare your bike! Follow the steps above to ensure your bike is ready for tuning.
2. Call several shops and ask what types of bikes they tune and what type of system they use for tuning (ECU Flash or Piggyback).
3. Be patient while the tuner has your bike, it make take several days to complete the process.
4. Set your expectations - Your bike will run better with more power, but tuners cannot magically transform a 600cc bike into a 1000cc bike
5. Enjoy your tuned bike!
 
Last edited:

Motojack

2019
CBR650R
May 26, 2019
Wow excellent post thank you. I plan on just keeping the oem air filter after getting a full system, PAIR removal, before getting an ECU flash.

Is that a problem?
 

trippy

2019
CB650R ABS
May 2, 2021
Riding Since
3000
Wow excellent post thank you. I plan on just keeping the oem air filter after getting a full system, PAIR removal, before getting an ECU flash.

Is that a problem?

If you go for ECU flash you should consider getting an aftermarket filter.
The ones for 650R have a bigger surface, higer flow and improve the sound.
The upfront cost is higher, but the filter can be cleaned and oiled regularly.
 

Motojack

2019
CBR650R
May 26, 2019
If you go for ECU flash you should consider getting an aftermarket filter.
The ones for 650R have a bigger surface, higer flow and improve the sound.
The upfront cost is higher, but the filter can be cleaned and oiled regularly.
I guess I'm just paranoid about the after market one. What If I dont clean it good enough? Or apply enough oil? It might start letting crap into the engine. After their quality control on oil filters I'm not sure I'd trust KN with an air filter tbh.

Need a bit more research I think to make up my mind.
 

trippy

2019
CB650R ABS
May 2, 2021
Riding Since
3000
I guess I'm just paranoid about the after market one. What If I dont clean it good enough? Or apply enough oil? It might start letting crap into the engine. After their quality control on oil filters I'm not sure I'd trust KN with an air filter tbh.

Need a bit more research I think to make up my mind.
I use a DNA air filter and is good build quality.
I clean it at every oil change (6000 KM) using the K&N foam and oil. It's not a rocket science and only takes patience. A clean filter (K&N/DNA) will be grayish color. The oil is red(ish) so you can't miss spots when reapplying. There are many youtube videos.

Last time I did it the throttle bodies were very clean. Will take some photos in... 3000 km.
 

miweber929

2014
CBR650F
650 Alumnus
Staff
Feb 13, 2015
Woodbury, MN
Riding Since
1975
I guess I'm just paranoid about the after market one. What If I dont clean it good enough? Or apply enough oil? It might start letting crap into the engine. After their quality control on oil filters I'm not sure I'd trust KN with an air filter tbh.
Yup, in total agreement. I’ve yet to see any aftermarket filter be any better than an OEM one; if there was more “performance” to be had from a larger filter, it would have one from the factory. The 650 is not struggling to get air, there’s plenty available for it as it is.

The only thing the oiled ones have going for them is the fact you can reuse them. I’m a lazy guy, and it’s VERY easy to over or under oil a reusable filter despite what people say. Buy OEM: they’re cheap, they filter very well, and replacing them is easy. Win, win, win in my eyes.
 

Jluu

2019
CB650R ABS
Jul 21, 2019
I ordered a K&N filter last summer and the quality was terrible. They're supposed to be one of the most reputable and quality filter manufacturers but I was not impressed. I returned it and kept the stock filter.

The performance gains would be negligible for my purposes street riding, especially without a proper tune.
 

David 47

2020
CB650R ABS
Mar 30, 2021
Long story short purchased 2020 cb650r. Fitted air intake trumpets, race air filter and power commander then put on dyno. Had accident bike written off (bent frame) bike still ran perfect after accident. Purchased 2019 cb650r fitted all of the above fuel pump won't prime with power commander plugged in but will without. Any ideas ? Thanks in advance.
 

David 47

2020
CB650R ABS
Mar 30, 2021
Long story short purchased 2020 cb650r. Fitted air intake trumpets, race air filter and power commander then put on dyno. Had accident bike written off (bent frame) bike still ran perfect after accident. Purchased 2019 cb650r fitted all of the above fuel pump won't prime with power commander plugged in but will without. Any ideas ? Thanks in advance. Ps also running full musarri exhaust .
 

miweber929

2014
CBR650F
650 Alumnus
Staff
Feb 13, 2015
Woodbury, MN
Riding Since
1975
Long story short purchased 2020 cb650r. Fitted air intake trumpets, race air filter and power commander then put on dyno. Had accident bike written off (bent frame) bike still ran perfect after accident. Purchased 2019 cb650r fitted all of the above fuel pump won't prime with power commander plugged in but will without. Any ideas ? Thanks in advance.
That would indicate the PC is probably not powered correctly. Do you have it tied to the proper battery terminal?
 
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