Alan Millyard is like, “hold my beer”

First time I heard of someone looking at what Allen Millyard does and thinks “Yeah, I could do that” and then do it! It’s not just the engineering achievement, it’s making it look like it came out of the factory! It looks amazing!

I saw this bike in the flesh today. It is so perfect, I didn't even clock that it wasn't a standard LC at first. Amazing engineering.

Brilliant. Just waiting now for someone to bolt two RD400’s together. Good work. Well impressed from an an ex LC nerd. 😊😊

This is truly a thing of beauty. A masterpiece! Brought back wonderful memories of my 100cc, 125cc, 250cc and 350cc air-cooled 2-stroke Yamaha twins in the 1970s - but they were nothing like this!

Well done mate, very impressed. Have seen triple rd before but not a four. You deserve a medal for creating that. Excellent!

Simply beautiful I had a 75 rd 350 and a 77 rd400. Loved those bikes. Long live two strokes!!!

What an awesome machine that yellow quad pipped Yamaha is two 350 engines must be a blast to ride Kelvin is a magician never heard of anyone else doing this to a 350 Rd it must go like a rocket 🚀 with its pops and bangs

Absolute per-FEC-tion!!! This is the bike Yamaha should have made back in the day! The creator deserves a medal for making this! ❤❤❤

What an incredible bike! Always loved the yellow and black paint scheme. That RD 250 was awesome too. Had a '72 DS7 250 back in the day, the RDs came out in '73.

Love how the bike is parked in the ‘disabled park’. Hopefully not a prediction! Awesome bike you got there 👍🇦🇺

When you’ve got crap like Britains got talent then you go behind the scenes of British life to find genuine talent! Building the lambretta was one thing this is class. Thanks for sharing 👍

WOW! What a beautiful bike! It looks like what Yamaha should have built! What a GREAT JOB! And thanks for sharing it with us!

Boy o boy that is without a dout the coolest build i have seen in a looooong time......

What a wonderful and Beautiful peace of engineering.

I love that a man can take something that was never supposed to be and makes something special.

got to appreciate the amount of engineering that went into that!

What an incredible one-off build. Hats off to the builder/fabricator. It's so amazing what these people can come up.

That is just a stunning achievement mate, well done.

I've always expected to see a quad cylinder RD, but until now haven't. The thing that really caught my eye was the absolutely beautiful job Kelvin has done on the the pipes! Just an awesome job he's done here. I would have given a nut to own this back in the day!

It is truly a miracle work! Wonderful!

This was cool. This was respectable. The bike that rips.

A friend left me his racing 350 for a couple of days. It was adrenaline time for a couple of days. Your bike is a beauty!!!

Amazing solution to keeping the chain aligned with the rear wheel on the 500. That's a pretty trick 250 as well.

Wow ,what an awesome job , I am amazed at the sheer talent some people have, that engine is up there with factory finish , you have a real talent there man , keep up the awesome work you do 👍

As a Busa rider who’s first bike was a 1982 RD 350 I would trade my bike for that one in a heartbeat!!! Love it man !!!

What a beautiful bike, the RD 500. I had a 1975 H1 500 triple with denco chambers. Little brother of the widowmaker. The sound and the smell of these bikes is just awesome. Had great times with it.!

The RD Yamahas from the 350 on up are a riding experience that I think every street bike rider should be able to have. I once rode an RD400 around quite a bit, and it both scared the shite out of me, and thrilled me at the same time. I loved it. I could pull wheelies with it effortlessly. They are badass and I can also see why a lot of guys raced them, and also wrecked them. I also got to ride an ATC with a specially make frame that held an RD350 engine that was built up for even higher performance, chambers etc. than stock. It was insanely fast, hard to control, and some of the funnest riding I've ever been able to do.

So well built Yamaha should have done it 😀 brilliant stuff real nice looking bike from all sides ☘️☘️☘️ from northern Ireland

Very cool. I love to see guys building radical two stroke bikes again. Imagine what two strokes would be today if the big manufacturers hadnt stopped building 2 stroke street bikes. A big thumbs up to all you geniuses out there creating these 2 stroke animals. ❤ Keep at it please.

Had the old 350 RD back in the 70s awesome 2 Stroke this 500 looks great

Proud Papa has a lot to be proud of!!! Spectacular job, Brother!!!!

What a technically brilliant job , from the factory finished look to that amazing burble. A truly wonderful creation hats off to you sir and thank you for showing some of that great engineering

My dream bike 😮❤😊 wow!! 👌

The TZ’s smaller cousin, the artistry alone on this bike is amazing, never mind the mechanical side of it. Well done ✌️🇺🇸

That is what yamaha should have built, nice job.👍👍👍

Brought back memories of my 500 Kawasaki triple . Awesome build .

His bikes are a kick in the ass that feels good all day long...

In my 50-plus years of riding motorbikes, I've never been a fan of two strokes, but I have to say that's quite impressive

The RD-250 SOUNDS like so much fun!!!!😊

Marvelous build of an RD 500cc.... Looks great and is a dreem pice of engeneering, nothing better than two stroke motors miss them so much...🤔 Greetings to Kelvin Bonarski, and Alan Millyard 🤩

What great work, I really enjoyed the video.....back in the 1980's there were a couple of RD500LCs made, one was black and even had stock LC pipes and both were liquid cooled too

What a beautiful motorcycle (and it's a two-stroke beauty).

Très belles restaurations ! Un saut dans le passé qui enchante les oreilles des connaisseurs et/ou des nostalgiques...

Beautiful tank and paint ,that top camera shot looks real smooth 3:00

I saw it in the flesh today at the VJMC Boxhill megameet, really well done and sounded lovely

Just brilliant! This man is an incredible craftsman and engineer.

Man ! How I would love to own a bike like that ! Trinidad & Tobago. West Indies.

Absolutely beautiful. That sound is music

that shot at the end with the scooter explains where the original RD350LC motor went.

Bro that is pure beauty, well done on an absolutely amazing machine and show. I really hope manufacturers pump out affordable two strokes again once the problems of emissions are sorted because they will sell frigging well

Great job sounds killer to

Powww incroyable elle est magnifique 😍 un vrai sorcier de la mécanique ! Bravo 👍

Exhausts worked out just perfect

It's thing's like this that reminds me that I am just an average man, brilliant engineering skills Kelvin has.

Respect looks like i am 16 years old in pass, the Yamaha RD 250/350 come new and we are16 years old and love them all!!2 takter are so light weight,its a great fun drive one!! Great Master pice!!! Sorry for my bad english best wish Reiner from Germany

Nice! From one of NY's most prolific collector of daily drivers...'67-'89 two stroke Yamahas life long ownership and all plated. It's time for me to seek out a 4 banger.

Well congratulations Kelvin. You made it look like a bought one. You proved a point. Not only could it be done, but looks fantastic too. I can't believe how well the wide motor suits the RDLC bike.

First bike was RD250LC, hit 170kph going to rego office to pick up my newly acquired licence, loved it.

Loved 2 strokes since the first day I heard one. Like a hive of angry bees. And the pull when you're in the power band, on the pipe...just can't get that from a 4 stroke, unless it's substantially bigger. And you can't forget the unmistakable smell of 2 stroke oil in the air.As far as matching them up CC to CC, 2 strokes win every time. Fun factor: 11

That Is So Cool ✅ Absolutely Love It

Sounds just like my old 1984 RZ 500 sounded. Wicked!

Can it do a Wheely? Ha ha ha. You bet it can! I was a teenager in the 70's so I got to see ALL the Bad Ass Bikes and Cars of that decade! Love it!

Can you smell it ?Love it.

I'm a former owner, (my favourite bike was a Daytona Special, I put an RZ350 motor in) Just dropped a fair amount of cash on a 77 model. I have NEVER seen a RD with stock pipes, AND a stock air box. Yes, pulled the air cleaner out, and ALMOST asked what this is. Now, a LOT of work to do.

Beautiful Build . I was not able to tell for SURE , but I think he made a 90degree (90/180/90) crankshaft . ? Not in Pairs , separate firing for all 4 . If that's the case , two separate RDLC or RZ igniters , set 90 deg apart on a common backing plate , with uprated twin lead Coils might have worked .

I wouldn’t mind spending an evening in the pub with Kelvin and Allen Millyard, what a pair of true engineers. ❤

Utterly superb! I remember maybe Bike magazine doing a joke cover with an RD500LC (which was actually a model) on the cover years ago

What a lovely build, id love this i honestly would.

Sounds wicked 🎶💨💨

Great job 👏

Kenny Roberts colours will never get dated,..Had a yellow RD 400 back in the day which spent a lot of time on the back wheel!

another great video that blokes full of talent and ideas and thats another bike video you twisted my arm to watch 😅😅😅

What a fantastic bike! Great job.

Absolutely beautiful bike. I have always loved YAMAHA bikes and still do. I am the very proud owner of a YAMAHA XJ6 Diversion and love it to bits!😍

That is a masterful job you did to create a inline 4 cylinder out of RD cases. The bike is simply gorgeous! I had a DS7 RD 350 and a RD 400. The 400 was tricked out with everything and completely stripped down, it was fast and explosive. Topping out 6th gear for more than 20 seconds would blow holes in the pistons. I should have put larger carbs on it so the engine could breath better. I injured my back and had to get off them but I will never forget the fun I had on them.

Absolutely BADASS! Nice work.

Yes please the sequel!

It's amazing to me this bike is air cooled and is a two-stroke and has four cylinders in a row and the inner cylinders don't overheat. The best two-stroke street bikes to me are 200cc to 500 cc twins. Two stroke engines burn lots of fuel so the smaller displacement the engine is the better.

I'm planning on doing something similar. I have 4 RD350LC Cylinders but only one head. My plan is to leave the trans alone for the most part. I plan on basically keeping the stock motor layout with an extended crank pin having the drive gear machined onto it and the other end extended to plug into the other set of cylinders. I was concerned about the motor getting to wide but yours seems ok. I was surprised to see the trans and cases at full width on both sides. That really does keep it looking stock... Very nice sir. We'll have to get together for a ride once I get mine done. So tentatively planning for mid 2026??? 😊

This bloke should be running the country........

They have the RZ (water-cooled) version here in Japan. There are a few still on the road. Not a 500cc version, of course!

love it, my first bike was a 76 rd 400, 2nd 83 rz350

We’ll done sir. I had the 250 Air cool and then the 350 LC . I did have a go on the RD 500 YVPS brand new and it shore did move I all most bought one. But what you built hear is a one off build I love it all you are good my friend. It is totally beautiful just looking at it and the sound is stunning. I had new allspeeds exhaust on my 350 because I did not like the sound of microns and you built these pipes well hats off to you they sound like Allspeeds. You can’t beat the 4-pipes going even on tick over. And the worlds first. Really really nice.well done 👍

My friend mark crisp and my brother put together a four cylinder bike together using the standard LC chassis with twin disc forks and four 250 LC barrels on using two rd crankcase’s + cranks rebuilt by Dave East from Leicestershire built the cranks assemblies and Mark crisp and my brother had the crankcases welded up using a big steel bar to stop any warping the project was on the front cover of motorcycle mechanic in the 1980s and the full right up in side the same magazine. It’s good to see a fantastic job keep up the good work many thanks Colin Suffolk .

The greatest bike Yamaha never made. And if that were a genuine P reg bike, then would have been the perfect time to launch it

amazing bike, my friend just built a 700cc dragster with two RZ350 engines welded together like this one. got to love the two stroke

Stunning. I rest my case.......

What an awesome build and SOUND!

That sound.... Perfection.

What a thing to behold if u love 2strokes

Truly a work of sheer brilliance,,,would love to see her,,,regards Eddie in derby 👍

Awesome bike. God theres some clever people around!

Absolute master piece .perfection ❤

Fantastic !!!!!

Wonderful craft, superb.

Uh, goosebumps ❤!!! My heart goes 2- Stroke 😊 What a wonderful , beauty motorcycle 😊👍 By,the way , I ride MAICO GS 490 ccm Best regards from Germany 👋👋💨💨💨

Great job mate. Such dedication

Hey Kelvin , great looking bike. I used to have a Yamaha (77) RD 400!

Awesome bike! I once had an RZ350, wish I would have kept it.