DT125R FORUM

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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

Finally! Actually found some time to go out on this thing! [image: L5TZajj.jpeg] The original gearing I bought for this was a no-go and I ended up chucking it in the bin. Instead, I found a Trail Tech crankset made for an E-bike, had to swap out the bottom bracket, but the result is something which gives me the ability to go up a few teeth on the front (currently rocking 24t), blitzes up moderate inclines, but lacks real top end. [image: faXVi2L.jpeg] I managed my usual route easier than the 26er, both up and down hill. It just felt like it handled the rocky sections better than the 26er, the lower gearing made it easier to climb some of the hills I had to get off and push, overall I'm very pleased about how this one has turned out, hopefully get a lot of use out of this over the coming years.

While I check if that is indeed the issue, allow me to share the "before and after" of my troubled rebuild (tried uploading but it seems all my images are too large to compute, sorry): Before: https://drive.google.com/file/d/10vFChB0EYgA4KcdGXxD0ADUuBkG3_3L1/view?usp=drive_link After: https://drive.google.com/file/d/1-vahreq0O_fcCLm1wl73cvFQxRDeTEqF/view?usp=drive_link

Update on a problem. i have pwn on bike now nad i remover rubber under seat, bike now sound so good. And i got so much on a power, i thing this pwk like more air. I put bigger main jet in it and i get better throtle response on idle!, those carb are weird. And torque in low rpms is crazy. 3rd gear on 3500 rpms, i give it throtle and bike pulls like crazy right into a power band, so much low end grunt, and a sound of a intake its so good with a aftermarked silencer. I am so happy with a bike now. And those pwk copies are good, just jet it corectly. I am planing on opening a expansion chamber and cleaning it out, and removig everything from it, cuz i saw there is like lining inside. Should i remove it or not ?

@Calum That site is known even more year's!!!!!