huxley Posted April 10, 2017 Share Posted April 10, 2017 I have just finished running in my RD250 LC after a 0.5mm rebore.It has a set of Allspeeds,standard air box,non tuned barrels and standard carbs.It also has new main and big end bearings and new crankshaft seals. When I try to rev it into the powerband (4000 - 5000 rpm ) it has a hell of a flat spot and to best describe it it gurgles and struggles to get there.I can slip the clutch to help it out ,but I don,t really want to do this. My needle clip is set 4 notches from the top and rest of the carb is as standard. Any help please Huxley. Link to comment Share on other sites More sharing options...
Moderator Cynic Posted April 10, 2017 Moderator Share Posted April 10, 2017 I had allspeeds on my old lc many years ago. And yes I wish I still had it. Known as engine killers in the day, more extreme than the microns. But looked much better, sounded nasty too. Stock carbs is a no no. Personally I have no clue today as to the settings you need but I expect you will need to re jet with those pipes or your pistons will die. An absolute must will be use premium fuel. She will be a nasty bitch around 5500-6k anyway all yam 2 stroke twins are, they kind of stop and take a breath before the power kicks in, my completely stock TDR does it, just not as extreme thx to the pv and being stock. But it still fafs and farts about a bit if you don't boss it about. Link to comment Share on other sites More sharing options...
mcferreira100 Posted June 16, 2017 Share Posted June 16, 2017 needle 4 notches from top souns very rich..i run 2nd from top..made huge difference to that flat spot Link to comment Share on other sites More sharing options...
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