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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
RB Carb Mod Jetting Report
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[QUOTE="BRush, post: 86774, member: 18729"] Just thought I'd post some feedback about my progress in dialing in the jetting for my RB-modified carb. Motor: 225cc big bore kit, w/light porting. Air-box mods FMF torque pipe power core silencer plug: BR7ES Boyesen power reeds (#607) Fuel: pump gas (Mobil unleaded premium) Altitude: 1000ft Temp: 65-70 deg F Ron's original recommendations were: 155 main, 45 pilot, needle (AEG) on the fourth clip. Air screw 0.5 to 1 turn out. I started with 3/4 turn. With these settings the bike ran ridiculously rich off idle to around 1/4 throttle. Massive burbling and gurgling. Fiddling with the air screw made a big difference. I opened it up in half-turn increments. At 2.5 turns, things got dramatically better. At that point, I stopped screwing around with the jetting and just went riding. This last weekend, I dropped the pilot to a 42. The air screw for this pilot size seems happiest about 1.5 turns out (though I'm still experimenting). This pilot/air screw combo brought another big improvement. The bike now has a clean, linear pull right off idle. I'm really pleased at the way the low end power deliver has improved. :cool: I'm trying to decide what my next move should be. My main jet run was cursory - just to be sure that I was not too lean. I'm considering dropping it to 152 and check the effect. I can't remember how this works: is the high speed circuit affected by the low speed, or is it the other way around? I thought I remembered a post by MX Tuner that changing the low speed affects high speed, but not vice-versa, so tune the low speed first; but I may have that confused. The other thing I might try is to lean the needle once clip to see what happens, but I'm on the fence about that because the 1/4 to 3/4 range feels pretty good right now. Where I'm at right now: Jet Needle: "AEG", 4th position Slide cut: #7 Air Screw 1.5 Main: 155 Pilot: 42 [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
RB Carb Mod Jetting Report
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