DOCWOB - How to build a Carb 101 - KX250 updates!

SEASON 2, EPISODE 12
2 Strokes, Carbs and VMXdN Kawasaki Bike Builds
In this week's episode, it’s all about building KX two strokes, especially as we have so many to build to VMXdN Foxhill. On Kawasaki’s this year we have Tommy Searle and Mike Brown on 2001 KX 250's, and a last-minute 1994 KX500 build for Tyler Bowers. It’s great to build a different model of bike as it means we extend and develop our own range of products. For these builds we have developed and manufactured titanium bolt kits, aluminium nuts, linkage bolts, axles, bar mounts, front and rear brake carriers, oversize front and rear discs, power valve covers, axle blocks, brake clevis's, brake fluid reservoirs, ally low boy tanks, peg mounts, silencer mount and chain guides and these guys will be putting the new stuff to the test before we launch them on general sale.
We are building a 1994 KX500 for Bowers to race which is replica of his own ‘The Unit’ build we supplied parts for a couple of years ago. It’s been a while since we built one of these, but the frame is out the powder coaters, and we should have her up on her wheels by the end of next week. We have plenty of experience as we have previously built KX500's for John Dowd, Ron Lechein, Jeff Emig, Jeff Ward, and Ryan Hughes to race at VMXdN events.
Carb 101 -This is how we do it! There will always be someone telling us we are doing it wrong but with over 30 years of experience this is the way we do it. I have a pretty comprehensive jet box and have picked up a few tricks and mods over the years which I share with you on the episode, including what to do if she is running lean whilst on the gas, rule of thumb for the air screw, and explain why she may be bogging off the jumps as well as a little story about vent piping.
Back to the bike builds, on TC100 and Brownie’s race bikes we are waiting on cylinders and pipes from Pro Circuit to finish her off but she’s only a couple of days away from being done. I give you some insight into which part costs $4.5k and which part we sourced off a jet ski and why!
Brownie is choosing to run the lower sub frame, but Tommy has been out riding and prefers the taller subframe, (but we haven't tried changing the fork height in the clamps to counter-act the high back end yet) we have both available for each rider so they can decide what they prefer to race with.
With all these builds if we can’t find something, we make it. Our newest little part is a rear brake reservoir. Tommy is out riding his test bike and trying to see what he can break (so far only a back brake) and race test all our new parts before we release them on sale to you. As soon as we are happy, they will be on our eBay shop.
There is only one more video before we are at VMXdN Foxhill 2023, fingers crossed all the race bikes will be finished by then, best get cracking!
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[@joski9030]

That float bowl is trick. ! I’ve lost count of how many carbs I’ve rebuilt over the years I find it quite therapeutic. ✊🏻

[@docwobtv]

Yea the cleaning part isn’t fun but bolting it all together isn’t the worst job

[@skylerclayton8990]

These old kx builds are awesome

[@Sb-do6xc]

Would absolutely love a McGrath replica ktm. Would also love to see wob work his magic with the beryllium on the front brake calliper surely this would be a walk in the park for rob the fella is a magician

[@docwobtv]

We better get on it!

[@anthonygibbo1881]

I can only hope the channel gets some more momentum with wob dropping some jewels of knowledge in there as well 👏🏻👍🏻

[@zardportugal]

Amazing stuff. A joy to watch. Cheers.

[@docwobtv]

Thank you we try our best!

[@Parko2017]

What a job u have made for yourselve wob proper decent. I remember last year when brownie came in stright after practice and wasnt happy with certain stuff on the yam but u boys just listened and went to work and watching u on the sides for about 40mins was class. Well deserved beer on the satday night

[@docwobtv]

Sounds like a plan on the beers front!

[@TheClassicMotorcycleChannel]

Good video :)

[@docwobtv]

Glad you enjoyed it

[@nickmogridge9345]

I’m a massive fan of your work, the excitement for VMXDN this year can hardly be contained! Can’t wait to be there 😊

[@docwobtv]

Yea it’s going to be epic!

[@malccolliver4721]

Absolutely the bollocks wobs and team need this as a weekly thing with all bikes 👌👌👌

[@docwobtv]

That’s quite the commitment to be weekly!

[@moto3463]

Beautiful work of Art

[@docwobtv]

Thank you! Cheers!

[@tessbushell5489]

Love your videos keep them coming 👍🏻

[@docwobtv]

Will do!

[@sixtysecondsofstephens2386]

Looking awesome.

[@docwobtv]

Thank you!!

[@lassevaltanen7436]

Lovely content as always 👍 Respect!

[@docwobtv]

Much appreciated!

[@Evo836]

Doc you have a box with lots of jets, I like a box that's tight. Ha Haaaa!

[@docwobtv]

Haha it’s a tight box

[@mikebrown41182]

Quality is the only word i can find in my vocabulary. You’ and the crew always make the time travel justice with these bikes Doc. Its hard to explain for those who perhaps not lived these eras, but for people like myself and so many others it certainly gives that unique feel, a bike and a rider / team can literally give you a Flashback not only related to the sport, but a different life we all lived in, hard to describe it but i am sure you know exactly what i mean! Thanks for sharing these builds. Cheers Doc!

[@docwobtv]

I know exactly chap, if you weren’t there it’s hard to explain yet it felt like hard work at the time!

[@martinslennon]

I remember there used to be a kit for emulating the factory carburetor vents, maybe Boyesen but I am not sure what the brand was.

[@carlhansen8668]

Love these videos.. 👍

[@docwobtv]

More to come!

[@TrialTube]

Love this content!!!

[@docwobtv]

Cheers kid

[@lionblue3449]

Keep the Kawi bits coming..

[@docwobtv]

Will do!

[@EA-nj4zd]

stunning i want all the doc wob parts for my kx250 absolutely stunning, job well done once again

[@docwobtv]

They are waiting for you on the website soon

[@itsjustweezer4054]

You forgot to ask everyone to subscribe haha, brother, theres no need to ask that anyway..... Not with this good of content. That like button is gettin a beatin worser'n mike browns front brakes haha Your my hero, The GOAT MX Mechanic for sure

[@docwobtv]

What an awesome comment! Thank you man. Maybe I ask people to share instead?

[@leadhead7338]

Team Green ALWAYS! The work you do is amazing Sir, I love watching your videos, My son races his 2022 KX85 that I keep maintained and rebuilt before this season started, and I enjoy working on it….Most of the time

[@docwobtv]

Yea the maintenance is such a big part of it, if you don’t (kind of) enjoy it, or at least get some satisfaction it can get old real quick

[@Beardmondy67]

.. Nice one Rob,.. Interesting stuff regarding the breather pipes ,..

[@docwobtv]

Yea there’s a reason for everything ….

[@Beardmondy67]

@@docwobtv .. Only just got into this MX malarkey at 56 and did wonder about the carb pipework compared to road bikes after buying an '87 KX500 and CR500,.. See you at Foxhills ,... :)

[@simpy112]

Brilliant upload. Cant wait for next video.. roll on foxhills vmxdn 😊

[@docwobtv]

It’ll be here before we know it, it’s sure to be epic

[@user-rg1jz7wo7z]

Usual great content Rob, your jet box is bit special, I bet secretly you count all the jets at the weekend just because you can!. 😂😉👊

[@docwobtv]

I should add it all up but I recon there’s ten grands worth in each box! What’s wrong is if I keel over my girls will skip it all!

[@user-rg1jz7wo7z]

@@docwobtv Some people collect diamonds, you've probably got the best collection of jets in the world!. Imagine in 40 yrs time this box turning up on the antique road show!. 😂😉❤️👍.

[@mervynmclean2283]

Here I'm hoping that bloody jet ski plug cap does not need testing at fox hills.

[@docwobtv]

Me too but the one thing we can’t control is the weather!

[@brentbaker954]

Have you ever messed with smartcarbs/ have an opinion on them?

[@jethroboorer2860]

Hey wobbles. Need to build an RM n get Pastrana on the gate

[@docwobtv]

I’ve got the bike but travis is a busy guy, I’ll keep trying though

[@earl6969]

The side pots on the carb is trick AF. Starving on jumps and hard angle left turns while hard on the front brakes made my 500 spit and pop... I only found out when I actually ran out of fuel and put the two together. Went through 4 different plug heats and jetting and chased my tail. All good to know. It's in the details mate...and I'm all ears. Cheers * Currently at Loretta's camping creekside behind the billboard. 🤠🇺🇸

[@docwobtv]

Oh nice, I used to dread going to lorettas but always had loads of fun there ! Tuesday nights in the beer tent were off the scale.

[@earl6969]

I actually had to drive down the road for phone service to post up!Renner,Brownie,Emig are on fire friend!...so is the air!🇺🇸🤠👍

[@Sn0w1981]

Must be busy over there these days! Cool, I Never knew why those hoses looped over the top. What I still don't get is the plastic screw that opens the throttle slide. Doesn't that defeat the purpose of the whole stationary jet/ air-screw setting? Shouldn't the slide always fully close?

[@docwobtv]

It’s plastic so as not to cause damage to the slide. Still a pain in the ass when someone has been at it with pliers

[@littemisscarrage2909]

chew on the end of the pipe a little it will warm and lubricate it then it will slide on real easy

[@docwobtv]

Yes I’ve done that on cheaper pipe but this stuff has a higher silicone content so is softer

[@gary444]

Looking forward to future episodes, any advice on finishing the rear swingarm? I've bought a 94kx 250 and it's been mirror polished but don't like it so looking for advice to get a finish like yours. Thanks

[@docwobtv]

Our process for the swing arm is a long one. I am sure we showed it in another video?

[@MrKdr500]

a previous video show the swingarm process.

[@gary444]

@@docwobtv I'll try to find it and I also need a set of your rear axle blocks to finish it off 👍

[@philiphayward8900]

Awesome video brother, bet that fool that mentioned locktite it's capable of even stripping and cleaning his own carb!😂 and if you carnt get it just make it is megga just like Allen miliard of Mx 👍🇬🇧👌🐐

[@philiphayward8900]

Sorry isn't! capable, I put its! Instead of isn't, however bet the _ock carnt even fix a puncture either!😂😂✌🇬🇧

[@philiphayward8900]

Cos I bet he's feeling a bit deflated after that silly comment about locktite 😂😂😂😂🐓

[@docwobtv]

Aaah he’s got a point but we only put a small amount in and blow them through after just to make sure everything is clear

[@philiphayward8900]

@@docwobtv that's me put back in my box 😂😎👍

[@danhurley6152]

Arnt there different slide types they're numbered ?

[@docwobtv]

Yes we’re running a number 7 on the kx500, the difference in number denotes the cut away at the rear of the bottom of the slide

[@jamster90]

awsome video, seeking a bit of advice..went tto clean my partners carb and one of the phillips screw's has been very over tightened and started to strip so i stopped, easiest/best way to remove it or is it a case of drilling it out and re-threading?

[@docwobtv]

As the screw heads are proud of the float bowl you can usually grab them with some nice fresh pliers but if it’s cross threaded drilling it would be tricky, I’d take it to a machine shop and get it drilled by a milling machine…

[@jamster90]

@@docwobtv thanks for the swift reply, will give it a shot this weekend, all the best mate!

[@marcmorris-kb9ry]

Knipex pliers with the small cutout in end of jaw ......none of this snap on shit .....😂mucj as i have a mountain of it....

[@michaelanderson2689]

Can you get someone to do a test after FoxHills, and compare them back to back!?

[@docwobtv]

That is the plan, test back to back against which bikes though? Each other or something modern?

[@michaelanderson2689]

@@docwobtv just your builds more the better and possibly compare with a YZF400! 🤔🤔😜

[@docwobtv]

Ok noted, I’m thinking we should do a back to back with TC100 on the pro circuit kx 250 and his revo kxf450, he’s sure to be quicker on the modern bike but by how much is the question, and if you divide the time difference by 22 for how old it is we can put a number on the development over the last two decades

[@michaelanderson2689]

@@docwobtv 4 stokes and 2 stokes can’t be compared anymore imo…. Technology has moved on too much!

[@Carbon_restoration_mx]

2nd to none, as cool as penguin 🐧 poo 💩 😎👏🏽🔥🔥🔥 c u at the hills

[@docwobtv]

See you there, the ticket sales, sponsors and trade are off the charts- it’s going to be epic

[@Carbon_restoration_mx]

@@docwobtv I’m on the media list Boss, filming and photos galore 😉🎥 smile 😊

[@andrewwilson9130]

I have a 22 crf250r and the front brake is very soft. I've tried bleeding it a couple times but it's still soft. Any suggestions?

[@MrKdr500]

S/S braided lines and Dunlopad HH brake pads.

[@andrewwilson9130]

@@MrKdr500 thanks! I'll have to try it

[@docwobtv]

If I’m honest there’s nothing wrong with the honda front brake if it’s all working properly, if you take the caliper off the carrier it needs to be free on the pins, if it’s bled properly then it’s either bad seals or bent caliper carrier

[@andrewwilson9130]

@@docwobtv ok, i will check the carrier. thank you!

[@kristiank77]

hopefully you didn't block the vent holes with the loctite, should have put loctite on the outside of the carb as opposed to inside of the t piece. great video though.

[@docwobtv]

We only put a small amount, and blow it through after

[@kamilam8820]

👇 Promo-SM