johnc Posted July 12, 2016 Report Share Posted July 12, 2016 Changed my RL250 which was using 40:1 mix to an RL325 which has had rebore, new piston and rings. Should I use same mix running engine in? Quote Link to comment Share on other sites More sharing options...
shakennstirred Posted July 13, 2016 Report Share Posted July 13, 2016 Have you changed the pilot jet in the carb ? 250 is 27.5 and the 325 is 20 main jet is the same. I'd say yes just give it a little time to bed in, so don't rev it out Quote Link to comment Share on other sites More sharing options...
johnc Posted July 13, 2016 Author Report Share Posted July 13, 2016 Thanks for that and yes changed jet. Have you changed the pilot jet in the carb ? 250 is 27.5 and the 325 is 20 main jet is the same. I'd say yes just give it a little time to bed in, so don't rev it out Quote Link to comment Share on other sites More sharing options...
nickyburnell Posted July 17, 2016 Report Share Posted July 17, 2016 (edited) My 250 with a 2mm overbore is on 125 main and 37.5 pilot on a VM26 and its perfect from walking pace. 27.5 was very baaaaaa on the VM26 A quote from Jim at BOC for the VM26 . Mines on 37.5, maybe due to overbore size Needle 5CN6 (from your old carb - unobtainable now)Needle tube O-4Main Jet #125Pilot Jet #35Slide cutaway 2.0 or 2.5 Edited July 17, 2016 by nickyburnell Quote Link to comment Share on other sites More sharing options...
shakennstirred Posted July 17, 2016 Report Share Posted July 17, 2016 My 250 with a 2mm overbore is on 125 main and 37.5 pilot on a VM26 and its perfect from walking pace. 27.5 was very baaaaaa on the VM26 A quote from Jim at BOC for the VM26 . Mines on 37.5, maybe due to overbore size Needle 5CN6 (from your old carb - unobtainable now) Needle tube O-4 Main Jet #125 Pilot Jet #35 Slide cutaway 2.0 or 2.5 That's if you running a 26mm, the stock carb is 28mm though 1 Quote Link to comment Share on other sites More sharing options...
nickyburnell Posted July 18, 2016 Report Share Posted July 18, 2016 That would be a good point! Quote Link to comment Share on other sites More sharing options...
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