DT125R FORUM

I'll be keeping a close eye on things, regular compression tests and plug chops to see whats going on.

I think I've done what I wanted with the head for now. I'd say I've given it more of a polish than anything

Its far far from perfect, but also a lot better than what it was :smiling_face_with_open_mouth:

one of the marks is still fingernail deep, but I'm reluctant to go much further without taking it somewhere knowledgeable with two stroke machining. I'm happy enough to fit and find out for now :winking_face:

I didn't need to read that, damn it :grinning_face_with_smiling_eyes:

Good read.

Little update. After running it in a little and opening it up a bit, I wasn't particularly impressed. It felt worse than before up top. So I did mess with the squish too much I think. Luckily managed to get another 3mb head in a more normal condition for £25 and have just fitted it and compression tested it and its up, so hopefully tomorrow's ride will be an improvement.

Now I have the old head here may as well look into getting it sorted properly at some stage and swapping back later down the line.

Crx is mine too, I like stuff from the 90's

Agreed :smiling_face_with_sunglasses:

Thats a real nice refresh of an RS there, fair play

I'm in the UK.......just see the price, lets hope it's not that

Its not the valve. I took the exhaust off and aligned the valve, unplugged the servo and it was still the same at the top. What should I look at next?

Cool. Its a bit dark out there now, but I'll let you al know how I got on soon

So, check the green black wire is grounded and stick a finger in my exhaust is the next port of call?

Cheers for the help btw guys

@Calum So there are other heads apart from them two, cool I didn't now :winking_face:

At least the whole top end can be ruled out now, plus ive got a spare head to play with, so not all bad. Just need to get to the bottom of this issue once and for all.

At this rate I'll have a nice stash of spares :face_with_tears_of_joy:

@Calum I'd adjusted the throttle too much so when I fired it idled around 7k I think was the reason. Took it out for 15 gentle miles yesterday and all seemed well, and took to work this morning, so far so good. Just trying to be gentle and keep the revs relatively low for the meanwhile and get some miles under her belt.

Its back together and running. Not ridden yet, but let it get to temp and adjusted idle. Took about twenty kicks to start first, but now its starting first kick. Took a compression reading before I started the engine with the exhaust off

Pretty busy tomorrow, but If I get a moment Ill take it for a spin and see what is what

@NINJA Yeah I agree. She is a French import, although it was the runt of the litter so to speak, and had expected stuff to go wrong and I guess the mileage is about right for a top end. Just surprised that any plugs I pulled looked fine and it always started first or second kick right up until that incident.

I've run it on super while I've had it, so I guess it must have had some crap French fuel a while back and just managed to hold it together pootling about French lanes until I got my hands on it :grinning_face:

On the upside this may well go to explaining why it wasn't too happy revving over 9k, so if it solves that issue at the same time, I'll be happy. 0.5mm oversize piston, small end and gaskets have been ordered today and the bore and head are at the machinists. Hoping for a quick turnaround :grimacing_face:

@NINJA I'll have a little fishing session with some magnets and see if I can find anything left behind.