2021+ Honda CRF300L Yoshimura RS-4 Full Exhaust Exhaust & ECU Tune Dyno Numbers

Curiosity finally got the best of us and we took our 2021 Honda CRF300L to the dyno to see just what this machine is capable of. Join us as we break down the power this bike makes along with some nuances and look forward to the future!

After tinkering with our CRF300L cosmetically, we wanted to try and push it a bit more in an effort to squeeze even more power out of it. Will our years of building proven racebikes hold over or is this bike a case of "you get what you pay for"?

[imcryoqa]

I did all this stuff to my 300. I really don't care what the numbers say. All I know is the bike is alot more fun to ride now.

[OriginalUsername]

Thanks for doing all the thorough testing, it's extremely useful to know what can be expected from tuning a bike like this regardless of what the actual results are.

[MYDOGBUD]

Gears..I'm running 14-45
Tune tier 2
CB cam change
G2 throttle tube
Full dominator system intake upgrades
Suspension, electrical and comfort upgrades..it's still a good platform to mod and about as dirt cheap that I'm willing to go to build on..
I can tell instantly it's a far superior experience riding with combined mods as a package VS the Grandpa feeling 300L IS off the showroom floor.

[samleary]

I’m sure there is more to be had but this is great confirmation that the yoshi pipe is perfectly safe on the stock tube. Great video

[linliv]

I think it was shonky productions from Australia that compared his tuned 300l to a standard side by side and ridden also by the stock bikes owner, thats the situation where you'll get an accurate account of things. The stock rider was definitely impressed by the difference in performance everywhere over his bike maybe not super bike type gains but enough to make him treat the bike with a bit more respect, no unqualified armchair comments required, great quality videos, very sharp images, great stuff on the crf300l for a great bike cheers from Oz

[chadrichardson]

The Yoshimura really helped to wake-up my 250F. Way more snappy on the throttle and sounds great. Looks sweet too!

[johnharris]

I have a full exhaust and tune on my bike, and I can personally attest to the performance. Gaines definitely worth it.

[Jackalope_Outdoors]

Thanks for the video and results. I've been on the fence about wanting an exhaust and tuned ECU for my 300L. Even though there are gains, it doesn't seem worth the cost...to ME. Some feel it's definitely worth it. To each their own.

[samtheman]

Did you install the CB300 intake? this engine is chocked up pretty good from factory... ????

[sumo_steve]

Excellent work Bart.
Did we do airbox mods to go along with the flash? That'll help. :)

[cck_loach]

Good content guys. Addressing the question on everybody's mind.

[motomc]

So will the bike run fine with a full exhaust without a tune ? Seems as though it gets a reasonable performance gain with just the full exhaust and the differences the tune makes is negligible but is it necessary to keep the a/f mix correct ?

[TommyNitro]

Surprised how little difference there is between the pipe and the pipe plus tune.

[t_c]

I wonder how this tune compares to the 550 performance tune. What i'd consider is the gold standard right now for the CRF300L tunes

[wilson]

Thanks! But No Thanks.

This will definitely be the last upgrade to be done since the negatives (louder, ecu swap, air box/filter & most of all...cost) outweigh the positives only in weight saving.

Thanks for doing the test though, very informative.

[lachlanmacchion]

Do you need a tune once you have installed the exhaust?

[clarkfox]

The new exhaust on its own will make the bike run richer , dose that make it run slightly cooler ?

[ihmomjokes]

its amazing how fuel injection can adapt to the new air flow increase a tune is almost uneeded compared to a carby bike

[justinmcphillips]

Very important question! If I am ordering a hyperpack bundle and a front headlight bundle, will I need 2 relays or just one? Really need this answered!!

[mt]

Are you offering a reflash of the stock ECU Tune? GREAT work and I order from TST!