March 28, 201214 yr If the DellOrto is from a 250/280/300 GG, then you only need to change the main jet to a 95, the std 33/35 pilot is fine. A D34 needle works best with the bigger Bultaco motor. From memory, the std set up with a GG would have: 270K needle jet (emulsion tube) 60 slide 35 pilot 120 main D36 needle (Fine with the 250, D34 better with the big bore motor) Fitted these carbs successfully to about 4 or 5 Bultaco's, 250's and 325's. Bye, PeterB.
March 28, 201214 yr Author thanks, the dellorto is from a gas gas 300, have sleeved the inlet, and it starts and runs, just need to sort out the jets, thanks for the reply will let you know how i get on.
April 7, 201214 yr I have a Delorto on my 340 with the following jets etc. Pilot 40 Main 98 Needled tube AV264 Needle X2 Slide 4.5 The transfer ports in the crankcase have been smoothed out and matched to the barrel (barrel not modified) and the rear sliencer has been altered to straight through pipe/packing, no baffles. Motoplat electronic ignition. Not sure how much these affect the jetting from if it was still standard (probably not at all as the chages are minor) but the bike runs very smoothly and revs high and clean.
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