CRF450R Head Porting with Boyko Racing

Boyko Racing ports the head of a 2018 Honda CRF450R.

[@user-bl6to5eq8m]

Learned the rough intake finish and polished exhaust port finish from an old timer who did my rmz 250 head. Tested it on a 1920s flow jet machine he was a cam grinder. He was awesome. Did my head for 100 bucks and made so much of a difference in power. I ended up opening exhauat more as well as he told me there was more room if I wanted. So cool. Im a machinist now of 20 years and new dream is to have a small engine shop to do my dirtbikes in lol

[@crawlz6226]

If I had the money I would pay so much just to shadow you for a few days to absorb and learn a few things. Awesome to see, I know I am 3 years late but I just started to learn about the things you can do to your bikes. Been riding for years, just started paying attention to the fine details. Keep up the videos!

[@DoctorMotorcycle]

I've heard people say "If you don't have a flow bench/dyno this is a waste" etc and that's patently false. If you port your head at home with basic tools, and follow the mantra that "less is more", and only worry about leaving the intake ports rough, removing the ridge inside the bowl area, and LIGHTLY laying back the short side radius + maybe an exhaust port polish and slight ridge sharpen, you WILL make an improvement you can feel, and will result in your jetting needing to be changed. If you do some light headwork and find that your plug that used to be a nice mocha brown is now white, and you have a stumble in the midrange that is cured by richening the needle a clip, you gained power dude. It's that simple. Every head I've ever ported on any dirtbike, motorcycle, ATV or otherwise has gained power everywhere, especially in the mid-top area.

[@wyldeyouth]

I concure. The engineers blueprint looks very different from the finished product with all the edges and seams. So grind that shit down and make it hard for the airflow to "bump" into such things. Its not that hard to see what would be too much.

[@peterdarr383]

Just adding that the valve guide boss must be made large in "production" castings due to "core shift" and you can whittle away about half of the boss and even shape it like a little wing to promote swirl

[@johndaroza2987]

Put the valves in the head then fill the chambers with fluid and make sure the fluid is equal in all Chambers

[@dennisxf9300]

Awesome job. I’m starting to teach myself how to do port work hopefully I’ll get as good as you sir

[@brucecalvert3887]

I have a 2008 honda crf450R and I have the head ported with oversize valves it increased the horsepower a lot with the other mods. My 2017 crf450R runs great stock but I just installed a 14:1 piston and bills dual exhaust my next mod is porting but I think about 2 or3 hp is all I will get since the design is so much better than the old one.

[@nancysmith9487]

Kyle Scott and Sano products nice job highlights his porting and polishing expertise... Thank you for sharing

[@unclequack5445]

That steel bit will eat through soft aluminum your very brave with that cutter.

[@LifeofAedan]

Love the Vice vibe in this video! Great one!

[@mxtechnicalsupport]

measuring is knowing, there is a flow bench for, but if it works? only a dyno can tell you:) btw great vid,

[@nuekgg2305]

Thankyou oldies :)

[@wil8115]

i love those old makitas.

[@Greybuiltracing]

Wish I would have seen more at the end 😢

[@denniswilder3014]

All he is doing is knocking down the high spots of casting and putting a slightly smoother finish on exhaust he isn't using real porting tools to change angles and opening up exhaust.

[@marc96accord]

I like this style but I do prefer a flow bench or CNC head . I’ve a had a Dasa head and now a big Racers edge head. Both CNC

[@96thundercat]

That looks pretty f u c k i n good my guy!!! :)

[@SLP-eb1wp]

Hi Im new to head porting. Can you tell me, does the dyno prove this works and by how much? Also, the Japanese engineers are quite competent right? How could hand held dremel work be better than Honda's original cnc cut porting that is backed by their engineers?

[@Hermiwalle]

its not cnc ported. its a cast port that is why he is cleaning the surface of roughness and impurities. the original mold is however most likely worked out in flow testing and computer programming.

[@MrDan1509]

Flow Bench.... You can get your numbers from a Flow Bench.

[@MrDan1509]

Also, all engine builders that know what they are doing and how to properly port a head will always re-port a CNC ported head..

[@deadheartrecordings]

CNC machines often have limitations that need help from a technician. But these are cast.

[@rodneyjones4890]

All engines can be worked on. Factory focus on fuel mileage & reliability. Just cause its a race bike doesnt mean its made from factory to its full potential.

[@navaho5430]

Your before and after are reversed ??

[@LifeofAedan]

What makes you think that?

[@WikWak]

I watched the whole thing and i couldnt tell half of what he did. I dont think the cameraman knew what he was looking at

[@jeromewells151]

How much power increase are you getting and what some flow #####?

[@SuggyRacing]

Interested to know if this made an improvement on the Dyno compared to before? Is it worth the time/effort? Nicely done though

[@MrDan1509]

Lets just say this, if done rt you will need no cam mod... A well ported head is all you need.. and some exhaust helps. Lol..

[@bstevermer9293]

I agree , need actual numbers.

[@jeromewells151]

With some flow numbers on that head that you just done?

[@MrDan1509]

@@Stutzvideo A master of this art can do it without a flow bench. Its a good trainer tho to teach people. Most do it like that to get every last drop of power. Most folks don't come close to using all that new power! Lol

[@ronnieshuler8350]

The before an after picture at the end 1 of the heads needs turn around so I can c the difference u all should caught that. Can't tell like I want 2. Ok

[@robertlambert7906]

What's the different in the stage 1 2 3 porting

[@amateuratvs3716]

Do you still port and polish heads?

[@brianmorrison9066]

I had my trx250r ported by Rick Kirmil. He told me and showed me exactly what he was doing. He had dyno charts showing temp, humidity, jetting, stock cylinder vs ported one, 23cc head vs 20cc. If a outfit dosent have dyno sheets, how do they know if they made any improvement or how do you know what your getting for your money? So, yes, they should have some. Now the next question, why won't they show you? I wonder?

[@johndaroza2987]

And what were your dino sheets

[@reminoel483]

Before and after is reversed but the port looks good

[@robertlambert7906]

So was this a stage 1 porting

[@colonialroofingofnorthcaro441]

For older models that have jetted carbs and not fuel injected, do you think a good port and polish job, you'd need to up the jet or should is stay the same with stock valves, thanks for the vid and your time. God bless

[@georgerobartes2008]

This is not a porting job , but a clean up . No angles are changed or volumes increased . I do Honda bikes and cars and these flow well out of the factory . Any head that does not have fuel atomisers directly pointed at the back of the valve will benefit from an 80 grit finish in the inlet port following the original contours . Do not enlarge any areas as this can lose mass speed airflow in the port and torque will suffer . A mirror polish finish in the exhaust has been a standard for decades for the reason he described to reduce speed of carbon build up , which effects flow out of the cylinder head . Increasing air flow will result in a change of mix so a size or 2 up on the main and monitor plug colour at WOT under load . Idle mix is a dial in but part to half may also require one size up on pilot jet . Again monitor plug colour and at 1/4 to half throttle under load . The difficult carbs are the Tillotson, Walbro, Mikuni pump diaphragm carbs with low and high speed dial in because mid range can be a nightmare to get right and requires a ton of experience and drilling fixed jets and galleries .

[@new_Cakra_racing]

Realy make better than before?....i think horse power not defferent than before....sure just HP change position on top but not more biggest...it's same...more soft power that in progress...thats my opinion

[@timjenkins6049]

Scary......

[@Onyxracesuspension]

Do you have an email I can contact you on?

[@UltralydvaskingLillehammer]

hmmm? an american technician improving a high tech Japanese product ?

[@mikerieck306]

Why not? Japanese factory race heads are ported too. Modern heads are very good but they are mass produced and can be improved.

[@StrykerV8]

I can call you racist, or I can ask you which is the world's biggest superpower, USA or Japan?

[@user-xk2hw6ej1z]

@@StrykerV8 we are talking about engines not weapons

[@peterdarr383]

Now imagine a Japanese engineer working on a Harley Davidson . . . .

[@TRX450RVlogger]

Great video! Check out my TRX450R Head porting videos. Also I need a Grinder like that one. My Die Grinder gives my comoressor a work out.

[@masonhendrix6266]

Do you do any for 2002 Honda Shadow Sabre vt 1100 if so what u phone number

[@nancysmith9487]

Boyko racing

[@user-yd7sp8dg2t]

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