Am legal @ long last! Only my CBT stands between me & nirvana! Two stroke heaven! ...

@jonne123

No disrespect meant from the start! But I’m guessing that you’re about 17 and haven’t ridden a great deal of bikes?
Every 125 Has been restricted to about 12bhp since the late 80’s AFAIK. Any bike that is significantly above that has been de-restricted and/or tuned.
You can unrestricted early dtr’s by ‘pinning’ the power valve open. This will give you higher bhp but will basically make the throttle an on/off button with terrible response.
Later bikes I don’t know as much. You can unrestrict them and the variable power valve will still give you better low rev torque/response (I’m guessing that is what you mean by throttle response?)

Do some reading up on deristricting your year model bike, then do some riding. Stop worrying about numbers bud, enjoy a wicked little bike for what it is, before yearning for more...

@Stevie-Wonder

I learned to change gear on a dt50mx, 14 years old on the local rugby field. 2 nights later I was riding it round the town pitch black in the middle of winter. I ended up falling in love with 2/‘S, has more Vespas and lambrettas than I can remember. Margate is one of the places I’ve actually ridden to, never had any problems cause nearly all my scooters were chopped ️

I met an old boy with one leg through buying DTR bits on fleabay, he used to race 2/‘S he’s got a Dt LC with an rd200 twin engine in it! Also a beautiful unmolested kh350 (iirc) I’ve never seen one of before. As well as a mystery covered bike I haven’t asked about yet. He only lives a few miles away from me. There are definitely some really interesting old souls out there!...

Better pic!

I only got this in May, but it’s MoT time tomorrow!

Eye exam in the afternoon so I can read a number plate @21 metres. CBT in a week with luck...

Am insured, so only tax needed as well...

It’s been 25 years since I was last legal on a bike, so I’m pretty excited...

I didn’t think mounting the clocks was a problem, I thought it was the drive gear wheel/spacer that meshes to the Yz wheel?...

@crispy

You see where the clutch cable connects to the engine? There is a little bundle of wires coming out there? These need to be checked for continuity.
Also check the wire to the coil. Also ones around the CDI unit...

Can’t really help any more. My wiring is 2 generations before yours!. Good luck...

PS have you wd40’d your ignition barrel!
Give it a good wash and turn the key back n forth

@chris
Think of tri-age, like war medics do. Does it really need the amount of attention, that could be better used on something else?...
I’d just wire brush it down, then satin black it. Job done. I’m just as guilty of over thinking things sometimes 🤪 check out Sound Blaster horns ...

The screw/nut adjusts the sound/pitch, like said...

Please turn it anti-clockwise till you can see the most of the piston without it being occluded by the power valve. I don’t know how else to say it...

@jimmydc98

Get it tig welded. Try any garage, engineering firm. They’ll probably do it for the price of a beer...

No one used this kinda gasket?
Given my experiences recently I’m wary of fitting it even though it’s new & Athena...

Sounds like the CDI unit. I’m no expert on later wiring though...

@dtr-nsr
It’s a cause, but not the reason in my case...

@calum
Pics to come when I fix phone!

Has anyone had dealings with Athena gaskets that are 3 layers fixed together with 2 brass rivets?...

Anyone? The outer 2 are black with the usual coating, while the centre 1 is silver...

@Dtr&nsr
It’s definitely heat caused, mostly my own ignorance
I understand that mixture being lean can run too hot, but it wasn’t solely that. There was even plenty of oil in the barrel and around the crank. Although it is a bit sooty and scorched!...

@Everyone
I have problems with my temp gauge, normal running temp is showing at 5mm above the C (for Cold) and any variation above doesn’t really show very much. It was below the halfway mark when the head gasket blew!!
The old radiator was a lot less efficient at dumping heat than the new one, it was OK when the ambient temp was not ‘heatwave hot’. The new one throws away BTU’s nicely.
Ideally I’d like to adjust the temp gauge with a resistor or something, so as that ‘normal’ temp is in the middle of the gauge...

@kevin
Don’t know about Legend...

Standard is 5j25 or 5j40. Don’t know if it’ll help you narrow it down? They both go with a Q2 needle valve though (tho the 5j40 is a Q2M)

Turns out it was heat seazures. 4 point seazure marks on piston, 1 bad enough to have ‘the look’ of sliding metal. More eating away of the piston crown and scoring to the barrel 🤨 it all happened before I changed the radiator. Oh well! We live and turn 🤪

@crispy
Just see if there’s any voltage at all going to it. I’m gonna hazard a guess about 12v?...

As to the ignition barrel? I don’t know about RE wiring, there are many connectors inside. On my bike just disconnecting the block allowed the bike to spark

@crispy

You see where the clutch cable connects to the engine? There is a little bundle of wires coming out there? These need to be checked for continuity.
Also check the wire to the coil. Also ones around the CDI unit...

Can’t really help any more. My wiring is 2 generations before yours!. Good luck...

PS have you wd40’d your ignition barrel!
Give it a good wash and turn the key back n forth

Standard tailpipe even has a drain plug built in at the lowest point to drain ‘splurge’. My pipe looks like the Exxon Valdez did a dump on it ️
That being said, rich mixture is the worst in my experience...

Since I’ve had the ‘new’ radiator on I’ve had a lot better temps during the hot days recently. I’ve swapped out the standard tailpipe for a BigOne that’s been laying around, this seems to be beneficial as well. It seems to be running even cooler. Not sure why...

The plugs been dry since I fitted the 17.5 pilot jet, the midrange seems good as well going by the plug. Top end/main jet is still buggered. The last two times I snapped the throttle open fully I had heatseize symptoms. Both times I whipped the clutch in and coasted to a stop, both times it started up straight away. I haven’t been in a position to recreate the symptoms to see if it was a genuine heat seazure (sp?) or a totall bogout due to main jet being wrong. It’s a 210 ATM, it was a 180 before...

Problem on top of problem after problem being an invisible problem 🤯

Oh well it’s all in fun and we live and learn while the World falls apart around us!