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General Discussion

A place to talk about whatever you want
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  • Please Introduce Yourself Here Before Posting!
    179 2k
    179 Topics
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    CalumC
    Here are the differences in the 3BN Cylinder head [image: 1483566896896-dt125rheads-diffrences.jpg] It'll be marked on the cylinder head. [image: 1663628447669-874e98a1-e604-4e06-9310-d20f77cae655-image.png] The 3BN head is interoparable with the 3MB head, but has a combustion ring which is said to adversely affect performance. Here is a video of the difference between a 4FU cylinder and a Belgarda 3MB00P cylinder. https://www.youtube.com/watch?v=P8okvTxe-Bs Here is a 3MB cylinder. [image: cylinder-1_medium3MB1131100-02_4baa.jpg] [image: 1663628477295-8e899a28-4514-4881-89ec-bfcc824ade10-image.png] You'll see the crankcases are stamped 3BN [image: 1663628512647-b054f520-0af7-4920-948f-cc532b8bbd25-image.png] For the most part you don't need to worry about it, it'll be rare that you'll find a DTR with a 3BN crank/cylinder and most of them will be 3MB cylinders. But it's just worth bearing in mind. There are variations in CDIs and Exhausts which affect the performance, but these are less important as there are aftermarket support that recitfies any loss in performance

  • This section is for members to talk about anything non-dt related. Please keep the theme and language clean to permit viewing in work.
    193 2k
    193 Topics
    2k Posts
    CalumC
    Normally, they just add a throttle stop to restrict the bike, so you can only open it 3/4s of the way. This is what a lot of the test centers do as it's easy then to unlock the bike to full power afterwards.

  • Post your jokes & funny things you find on the web in here.
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    118 Posts
    HOTSHOT IIIH
    @Stevie-Wonder Thanks bud Greta (for that is her name as she's noisy, irritating, aimed squarely at the youth market and responsible for thousands of them bunking off school all over the world) cost me half as much as my '93 due to the mileage and had a thick layer of grime all over due to years of grinding commuting. I gave her a scrub with Jizer (several times) and this is what was underneath Here are the part #s for the toolbox and lid, bit pricey IMO and you'd have to get the lugs welded on to a non-e start frame. Be a nice touch if you were getting it powdercoated sometime though https://www.cmsnl.com/products/boxtool_55v2817301/ https://www.cmsnl.com/products/lid_55v2818500/

  • Blog posts from individual members
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    15 Topics
    138 Posts
    NINJAN
    @Minia Looks nice and beefy and she sounds cool with a deep roar!!! :grinning_face_with_smiling_eyes: :face_with_stuck-out_tongue_winking_eye: :thumbs_up_light_skin_tone:

  • Content Not Suitable for Work!
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  • declanD

    Can you stamp aluminium

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    ZrakoZ
    I've never heard of checking the engine number on Mot ... All they did ever to me was frame (VIN) number on head tube
  • H

    Best 2 stroke oil

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    terry.tzT
    Silkolene good and Castrol good personally there probably no difference between 99% of them but I would rather be safe than sorry
  • H

    Transmission oil

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    terry.tzT
    castrol power 1 10w-30 good for me
  • V

    Ripping

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    J
    MX bikes runs way bigger piston to cylinder tolerances last time I compared
  • declanD

    Yz 125 or yz 250?

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    Glynn123G
    In the 3 years I owned my Gas Gas trials I never had a problem, changed the clutch and piston due to my riding style being heavy on clutches. Parts were easy to find and reasonably priced in my eyes, and it was just fantastically built and designed. To this day my favorite bike ive had, really regret the sale.
  • H

    Dt125x 2007 exhaust

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    ZrakoZ
    Mine was older type of big one on dtx . 1 bracket sorted it
  • S

    91 DTR theft claim in 2003 !

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    S
    @oldman By the time ive bought clocks wiring switches etc it wont be that cheap, at the moment its a POS in boxes. Ive slung most of it in the skip all the old plastics rusted tank etc, left with frame forks yokes wheels rear shock swinging arm airbox coil cdi and a broken engine. Wouldnt even make an old field bike at the moment lol.
  • N

    Pro taper bars and dep pipe

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    CalumC
    @natnice What job. Spraying your exhaust. I'd imagine you with a bit of elbow grease
  • O

    Rear footpath hanger bolts

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    O
    @ricky0115 did check the bay, no joy, going to do the Fowlers route and hope they can still get them, csml had plenty
  • N

    2001 Yamaha DT R 125 or 2004 Yamaha DT RE 125

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    Glynn123G
    Michellin AC 10s if you want to do some proper technical stuff, if you just want dualsport tyres which are good both on and offroad I use some cheap vee rubber ones that came on my WR wheels during the summer, gripped well offroad in the dry ish mud and I hit some gnarly stuff, utterly useless in bogs or bad mud mind, as are all dualsports.
  • A

    Yamaha DT 125 Stefan Everts Edition

    Moved
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    ricky0115R
    I'll take the seat Lovely bike, I wish I had somewhere to store it otherwise I would of took it!
  • N

    Buying a Yamaha DT 125...

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    NINJAN
    @natnice Standard size tyres are 80/90/21 front and 110/80/18 rear, You can fit 90/90/21 and 120/80/18 on the stock rims, but if you want wider tyres than that, you will have to fit wider rims first bud.
  • O

    White

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    S
    @oldman said in White: Have managed to find white panels, new and original, for the 89 when I start. Received a new panel today and it's off colour compared to the others, are there variations in shades/years?[image: tB0uqCY.jpg] You have the part number off the bag they come in for the side panel
  • V

    2stroke oil

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    terry.tzT
  • MightymanM

    Forum very lively!

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    CalumC
    No livelier than usual to be fair. [image: Jc33XBr.png] @Louis-James Yeah I've been working on this and have put in a lot of time on this over the last few days. But there is still lots to do.
  • Louis-DT-WRL

    Chinese Dt125r !! Its finally happened

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    O
    AND even they don't do a red one!
  • SamRatBoyS

    Hello All

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    NottsbikerN
    @andrewj1680 said in Hello All: My rgv250 was a animal i find hard to believe a rs125 would come anywhere close to it I've owned TL1000S, 996, Tuono 1000 etc so I know what animal bikes are like to ride RS125 was just a really nice small capacity sportsbike that's what I was getting at. Obviously an RGV will be quicker, but sometimes there's more fun in maxing a tiddler
  • R

    What's the difference between a 1998 and a 2002 speed wise

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    CalumC
    @oldman That's hilarious
  • R

    Full power, worth the risk on cbt

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    CalumC
    Either way, if you wait till you put the pipe on, you'll enjoy it more when you do fit it
  • CalumC

    Father & Son...Literally

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    O
    Taken me 12 years roughly to get going on the 125!!