DT125X DT125R Engine tuning stage Part 1

[@klinwalk9875]

Cheers mate , it was a snapped spring on the gear shift leaver,, like you said... Thank you.

[@JLMotorsport]

brilliant, have a nice one.

[@mark19850304]

I have the same duo!Honda Cicic 7gen and a Yamaha Dt 125Re 👌👌 just the Japanese I trust 😍

[@JLMotorsport]

Japanese only 💯

[@voihanviineri6402]

Very nice work! Wish I had those side exhaust ports on my cylinder :(

[@JLMotorsport]

PM us at facebook or instagram, we can help you.

[@voihanviineri6402]

@@JLMotorsport Thanks for offering help, but I don't think I have motivation to take the bike apart right now. At least before the summer comes, because my garage doesn't have heating.

[@voihanviineri6402]

@@JLMotorsport I'll make sure to DM you if I get the motivation!

[@valeriogomes3905]

Grande Joel. Videos top com muita componente técnica.

[@JLMotorsport]

O melhor esta por vir, este motor foi feito com um budget muito baixo, mas que ainda assim mostrou bons resultados. O motor que estou a fazer actualmente tem o budget praticamente do triplo deste, por tanto, esperasse algo fora de normal 💰💰 Fiquem atentos 👌🏻

[@axsport87solex]

Vocês subiam o cilindro para alinhar os transferes e rectificaram o topo certo? A que tempos fica a dtr assim? Obrigado e bom trabalho

[@JLMotorsport]

Sim, neste caso acertamos duraçao e o angulo de transferes, folga de squish na culaça e volume. O escape foi feito uns boosts para conjugar com os transferes. e pronto ficou uma cena engraçada mesmo usando o cilindro original. Se seguires o nosso segundo projeto que estamos a fazer no nosso canal, estamos a fazer um motor identico mas com cambota de curso longo (55mm).

[@benji431976]

Love your video’s I live in Worcestershire uk. Quick question for you I have a 2001 dtr 125 French import it will not rev past 8500 Revs I’ve tried new coil exhaust checked all wiring had generator checked by West Country windings tried another cdi too. Are they restricted in the cdi do you know. Thanks Ben

[@JLMotorsport]

Never seen DTR limited from the factory, probably what you need to do is to re adjust everything like power valve, carburetor and ignition timing.

[@benji431976]

@@JLMotorsport I’ve had two stroke for the past 30 years and have built many many engine and tune them to hi specs but I just can’t find the problem with this particular bike I had a dtr when I was 18 and tuned that with pipe carb reeds and power vale bolted wide open and it was quick did over a ton. But this one just start’s cutting out as soon as you get to around 8500 tried different pipes different jets etc. Thanks for the reply though.

[@JLMotorsport]

@@benji431976 whats the cdi code? 3rm?

[@georgedart1]

Mines the same changed the back sprocket to 55t and now a rear dep pipe and it’s a non standard front pipe not sure if dep or not it’s now reving up to 9000 instead of 8500 as before in 5th and 6th but still no more.

[@miguellamboglia7210]

Nice 👍

[@JLMotorsport]

Thanks bro, its coming something bigger and better =) Stay tuned =)

[@mark19850304]

I was wondering why You dont put a kickstart in the bike?

[@JLMotorsport]

Lazy Customer 🤣

[@Paul_vlogs96]

I have a 1997 dtr125 that bogs at 7k rpm I have a full dep system and running a 240 main jet do you recommend me going up a jet size or down? Evefything else is standard. French import

[@JLMotorsport]

A 250 jet + needle going upwards 1 position should work.

[@Tizzypj]

@@JLMotorsport I just see you understand jetting I have a 96 dtr with a 97/03 engine I got the wrong carb it’s of a trz and jetted at 140 not 125 (round cap mikuni) it runs and revs a little before obviously flooding vid on my Chanel I want to get a flatslide like what it should have and run the 210 jet but like above I have a cone filter and a front dep pipe so i think I need roughly 12% on the 125 jet in the round cap but I want to add a 30mm flatslide with power jet as I’ve been offered one cheap but how would I jet that to suit

[@Tizzypj]

I’m uk south east as well Hastings

[@Tizzypj]

My engine is the same as what is in this bike mate

[@Tizzypj]

And if I was to premix and save my self lots of money and hassle for the time being what mix would I run 32:1

[@AdriftersLife]

Wat brandt of carb did u use ? And how is it performing now…? Any good?

[@JLMotorsport]

Its a keihin 34. Permforms amaizingly 👌🏻

[@jeannanon3211]

Love it mate where are you base

[@JLMotorsport]

Coventry, UK

[@Tizzypj]

@@JLMotorsport not to far tbh mate do you know Lee Lee from Sussex 2stroke mx classics

[@MrGrzeja]

Waiting for dyno :D

[@JLMotorsport]

Struggling a bit to find a dyno shop who let us be inside the shop.

[@JLMotorsport]

any suggestions here in uk?

[@MrGrzeja]

@@JLMotorsport I have no idea, I'm from Poland 😅

[@lemotard929]

I havé thé same bike is so beautiful

[@confusingx3]

Nice work! What intake do you use for the 34 carb?

[@JLMotorsport]

Using the OEM one, rebored to 34mm.

[@confusingx3]

@@JLMotorsport There can't be much rubber left, right? I have the ZX125 (same engine) bored to nearly 140cc. My KOSO (PWK) carb 32mm look like yours and have a diameter of 45mm to the Engine. The OEM intake have a outer diameter of 43mm so I build a intake by myself. Is there a trick to stretch the rubber?

[@JLMotorsport]

@@confusingx3my carb has aprox. 40mm OD.

[@confusingx3]

@@JLMotorsport Then It will be easier ^^ Thanks for answering, stay tuned! Greetings from Germany✌️

[@user-qs4vp7ph6t]

What carburetor did you install ?

[@JLMotorsport]

34mm keihin

[@Aatu840]

How much does the pipe cost

[@218mika]

bro , you just good a new subscriber .. are thoose exausts made in that garage??? some welding pornnn right there damnnn

[@JLMotorsport]

Yes, all made in this little tiny garage

[@tiagopolini]

Qual a caixa velocidades?

[@lizicskabela6096]

Hi! How big pwk carb is it? Mine has a keihin pkw 28 and wondering about the right main jet and pilot jet sizes. Thank you!

[@JLMotorsport]

34mm we gonna show how to jet it in part 2, stay tuned

[@lizicskabela6096]

@@JLMotorsport Can’t wait for the 2nd part!! Do you think mine could handle with a 32mm carb? It is a 34x so the dt 125 lc with power valve system. I am a bit worried about the cooling of the bike. Is your cooling system oem?

[@JLMotorsport]

@@lizicskabela6096 we will keep the std radiator for this build seems to be enough, but we gonna add an extra termometer to keep an eye during the engine breaking in. We added 34mm cause we got a heavily tuned barrel so that's why. in you particularly case, not sure.

[@djCarterboi25]

Where did you get exhaust made I need one for my 170 kit

[@JLMotorsport]

I custom make them in my garage.

[@djCarterboi25]

@@JLMotorsport could you make one for a 2002dt that suit the 170 kit if so how much?

[@JLMotorsport]

@@djCarterboi25 Sure, down pipes cost around 300£

[@djCarterboi25]

Cheers what is turn around time on one being made

[@JLMotorsport]

@@djCarterboi25 around 2 weeks

[@OSGALDERIOS]

Quem fez o escape em inox ?

[@JLMotorsport]

Foi feito por nós.

[@robhayter484]

250ml to 5 litres ? Why so much oil

[@JLMotorsport]

Helps the piston ring to seal better, and gives anti-knock properties to the fuel.

[@robhayter484]

that much oil is not necessary, good if you like to waste money

[@alvarosilva5051]

Onde posso encumendar 1 para dtx vivo no uk tambem tanks

[@JLMotorsport]

Encomendar o que?

[@alvarosilva5051]

@@JLMotorsport o balao igual ao do video obrigado

[@JLMotorsport]

@@alvarosilva5051 Somos Nos que os fazemos em Coventry.

[@alvarosilva5051]

Boas mano isso ronda que valores se poderes dis em privado so o balao resto eu tenho obrigado

[@JLMotorsport]

@@alvarosilva5051 Manda mensagem para a pagina de facebook JL Motorsport LTD