That piston is a bloody work of art! Wow.
DTR/RE/X/Derbi GPR/KTM LC2/SachsZZ125 - Can all run the same 3MB piston.
DTR-DTRE, are the same barrel and stroke.
@declan Yeah, like I said. Get it all back to exactly how it should be. Then we can help to diagnose the fault.
It might be overshadowed by one of the many mods that have been done to the bike, hence why we are all struggling to come up with a single solution.
Or learn how jetting works. There is plenty of guidance on this forum for said information.
@Jens-Eskildsen It would make sense for the pump to be designed that way.
The oil pump is controlled by two elements, indirectly from the primary shaft, and by the cable.
However, if you look at the pressure at the crankcase using a vacuum gauge, I'm sure you'd see negative air pressure.
Since my car has a vacuum gauge, I know when my foot is off the throttle I see like -0.8bar.
Been on the RD sites and they are full of info on these bushes ????
Shocked as I've done a lot of Dt's over the years and never had this problem.
A firm called tss make billet power valves and bushes and there is talk of boring out old bushes and having a sleeve pressed in.
As said, two strokes smoke. So just saying it smokes isn't an indication of how good the deal is.
If it's blue smoke, then at worst the piston rings are worn out.
If it's black smoke then it needs new crank seals.
Neither are really a problem for a two stroke engine to be honest.
@Jens-Eskildsen If the bottle is overfilled, it SHOULD just leak out the overflow hose.
But so long as the pressure is gradual. If it gets a surge it will rupture the cap.
@castrolsniffer Nah check the oil galleries in the crank case bud.
Yhr connecting rod will have oil galleries as well. It clearly hasn't gotten to the big end.
