Really sounds like you are in good shape all around. However, you should closely follow advice on, especially the section on Acceleration Problems with an eye to how the bike responds at steady cruising (my ref. Stray/expermiment into a lean condition with your eyes wide open! Most important is not to stray too far into a lean condition - a rich mixture may soot up everything, but a lean condition causes seizures in the worst case scenario. I do a lot of plug reading via plug chops and if you are not seeing "white hot" (all white small dots showing heat damage from lean condtion) and not all sooty from a rich mixture, you are in the sweet spot. (Instructions at ).įrom the description, your plugs sound very good. Your Jardines flow a LOT of air, so it is not surprising you would set that needle at position #3. They have installed the DynoJet kit's adjustable needles and longer springs and put in a K&N. The shop that did this removed the airbox, then removed the carb covers, ditched the old needles, original springs, and should have removed the brass blocking items that cover your idle screws. Jardine slash-cut mufflers, which are the same length as the original mufflers. (The original jet needles were not given back to me.)Ĥ. The jet needles are DNO470 with instruction to set E-clip at #3. #Mikuni bds28 manual install#NOTE: I just found my original paperwork from the 2002 aftermarket muffler install and it shows a DynoJet kit #4148 was installed. I have installed new float valves and needles, and needed to (slightly) level two of the floats to match the other two.ģ. This is the first time carbs have been removed, so the inaccessible internals were original.Ģ. Yes, main jet is #95 and pilot jet is #20. But from the hip? Yes, go with the 2nd position and try the throttle on/off method to determine if you are running too lean.ġ. #Mikuni bds28 manual mods#If you can get those numbers to us, along with your pipe brand name and airbox mods if any that would help. If so, you may be reading jet sizes of 110 - 117.5, with a 22.5 to even 25 pilot. What numbers did you read off your jets when you removed/cleaned them? If the needles are adjustable, you may have an aftermarket kit installed (DynoJet Barons). I also seem to recall that the original needle was not adjustable - it simply used a shim. Unless I am mistaken, the 1998 used a Mikuni 95 main and 20 pilot jet. What are your thoughts about leaning it out a bit by installing the circlips at position #2? Current circlip positions are #3 (down from the top clip end). Naturally, I will resync carbs as well as adjust the pilot fuel screws, but I'm wondering if I should alter the circlips position on the jet needles. Spark plugs are all equally colored with clean white insulator, sooty plaque on threads, and light brown electrodes. All four carbs are fully cleaned and ready to reassemble with new o-rings and new float valves and needles.Ĥ. Right rear carb was indeed dirty(er) within float bowl, and had a slightly sticky jet needle slide as well.ģ. Rebuilding all four carbs due to afterfire from right rear cylinder believed to be carburetor related. Bike has seemed to run rich with 30 mpg, but has run well and started easily.Ģ. (Hmmm, or maybe the jet needles were replaced.)ġ. He did not remove the carbs, therefore he must have richened by adjusting the pilot fuel screws and/or the circlips on the jet needles. Ten years ago aftermarket mufflers were installed by a dealer and (as best I can recall) the dealer said he richen the carb to compensate for increased exhaust flow. Oils and plugs changed yearly along with Sta-bil, etc.)Ģ. (Kept fully covered in an air conditioned garage. Original owner of '98 Royal Star with 9,000 pampered miles. What is the default position (of the 6 available positions) for the circlip on the jet needle of a stock original BDS28 Mikuni from a '98 Royal Star?ġ.
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