hi all, just got a 1993 rm 250 to restore, i have just rebuilt the engine new bearing piston, ring and seals got it running and it runs really well ran it in like it says in the clymer manual, my problem is when it is warm it doesnt tick over properly it does for a little while then dies but starts ok, anyone any ideas, thanks mark

If it starts OK then you would think that the slow running mixture is fine at that point but as the engine gets warm the mixture could then be a bit too rich, perhaps the choke remains partially open because its seating seal is worn or perhaps the slow running mixture screw needs adjusting. Check your choke and play around with the mixture screw.

hi andy, i will have a play round with the mixture screw and see if that does it, when i was running it in i was using the mixture recommended which was 14/1 which seemed to be fine but makes me wonder if theres still alot of unmixed fuel left in there to. cheers mark