DT125R FORUM

I usually aim för 0,7-0,8mm squish for these engines, I think that would be good for the 3mb head too. You could also use a Athena cylinder head (they have inserts), I've seen those sold separately somewhere before. Check that the profile of the piston dome matches the profile of the squish area in the head.

You'll want to understand why that's happened before restarting the bike. Lack of oil, incorrect piston ring end gap tolerance, or just generally tired engine, etc.

Regarding the CDI I have, I read the same thing, so it's fine. I was looking for Ignitech, which is a little cheaper, but it turns out that in my country imports up to $200 are tax-exempt; you only pay for shipping and the product itself. If it costs more than $200, you have to pay an additional 60% in taxes. Regarding the CDI head and curve, I was asking about possible detonation or some other symptom that might not be very positive or beneficial. I was looking at the RSA 125 head design; I didn't expect it to work the same, but at least it seems like a design I could consider reliable or better than the current one. Everything is quite complicated here in Uruguay: resources, possibilities, etc. Perhaps with a test bench or sensors it would be easier, combined with the knowledge acquired over the years. There's a visa I could apply for; it's somewhat expensive, but it allows me to go to the UK to work and travel for two years. Maybe I could try my luck there. There's a lot of desire, but the problem is the resources available here. Thanks @Calum

Managed to source OEM indicators/mirrors (although not my taste personally). [image: JQleX2R.jpeg] A fair chunk of change was dropped on renewing brand new OEM NOS throttle, clutch, choke, Odometer cables. [image: m2jmkY1.jpeg] I also decided to paint the mild steel arrow pipe. Just make it look like a factory pipe and nothing fancy. I must have bought this pipe brand new 3 years ago and it's been in storage since and even then it's rusting.... It's no TYGA pipe for sure! Buzzing to get this bike complete though.

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.

@gazza76 sorry for the late reply, after getting the multimeter out, mine was a black earth issue, so inside the loom i had 1 wire was dead, this was the black runing from the loom to the connector block for the side stand, i also then had a Black terminal on the nutural relay at the back that was not creating a connection. maybe it helps you, easiest way i found was mulitmeter to the frame earth point at the coil. and stick the meter in contunaty mode, should beep when you touch the prongs together. and then probe all the black earths across the loom. Cheers

@glynn6500 oohh, yeah very hard to source. @scrimsmustang is a bit of a legend for finding things as well as @oldman IIRC. Your best bet is CMSNL from what others have said they are Wizards!

@glynn6500 said in Dt125r 1990 raspberry red: Re: 1988 rebuild update Hi there where did you find the Silver seat cover as I’m trying to find an original cover as the aftermarket covers are crap they don’t cut them the right way for stretching around the curve in the seat. Started rebuild mine back in 2017 complete strip and rebuild everything and replace every nut bolt washer was missing the head so the Conrad was seized solid It had been sat outside for 20 years so you can imagine what it was like.regards Glynn

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.

@BalnAndCantGetUp Update! The site was legit i was just overthinking it I fitted on my bike about a week ago and i did my first ride after 4 hole months yesterday. Needless to say it is a trustworthy site

@fishy-fish I'll put money it's that then.

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

Hello, Im in the very same spot as you, did you manage to get something done?

[image: 020dvoy.jpg]

Yeah, I hear that the bargains at Lidl get great reviews.

@HOTSHOT-III Would definitely like to see that. Would make for an interesting build for sure. I was surprised to see cast pistons in this kit, but apparently I have to junk them anyway to go with the stroker kit I bought as the wrist pin offset is different. So I've got a few more things to buy before this is called done.

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