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techtalk:evo:carb02 [2020/02/18 23:48] ixl2relax [The Idle Drop Method (IDM)] |
techtalk:evo:carb02 [2020/04/09 22:16] ixl2relax |
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| * Check the Main Emulsion Tube : Stock has 2x2Hi+4x3Lo Emulsion Holes - DJ uses only 2Lo Holes | * Check the Main Emulsion Tube : Stock has 2x2Hi+4x3Lo Emulsion Holes - DJ uses only 2Lo Holes | ||
| {{ :techtalk:evo:carb:cv40-needle-jet.jpg?200| Annotated by IXL2Relax at the XLForum}} | {{ :techtalk:evo:carb:cv40-needle-jet.jpg?200| Annotated by IXL2Relax at the XLForum}} | ||
| - | * The stock Keihin Emulsion Tube uses 6mm Main Jets - The DJ one takes only 5mm jets, which are incompatible with the Keihin tube and only available from DJ | + | * The stock Keihin Emulsion Tube uses 6mm-threaded Main Jets - The DJ one takes only 5mm-threaded jets, which are incompatible with the Keihin tube and only available from DJ |
| Here's the Dynojet Fraud Alert Press Release regarding counterfeit jet kits:\\ | Here's the Dynojet Fraud Alert Press Release regarding counterfeit jet kits:\\ | ||
| {{ :techtalk:evo:carb:dynojet-pressrelease-knockoffjetkits.pdf |}} | {{ :techtalk:evo:carb:dynojet-pressrelease-knockoffjetkits.pdf |}} | ||
| - | While some people have had satisfactory results with the DJ kits, if you are having trouble getting a good tune on the carb, remove all DJ items and restore the carb to Keihin parts including buying another slide if it's been drilled. The stock parts are good quality and will provide excellent operation if the carb is tuned properly. ((the opinion of many on the XLForum)) | + | While some people have had satisfactory results with the DJ kits, if you are having trouble getting a good tune on the carb, remove all DJ items and restore the carb to Keihin parts including buying another slide if it's been drilled. The stock parts are good quality and will provide excellent operation if the carb is tuned properly. ((the opinion of many on the XLForum)) See the paragraphs above about 'Some Tuning Considerations'. |
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| **Some considerations:** | **Some considerations:** | ||
| - | A) Even when tuned correctly, cold engines are more likely to have carb farts than after they warm up. It is easier to create a lean condition when you open the throttle and gulp a large amount of cold air. If you ride off while the engine is still cold, expect to have farts. When the outside temperature is cold, you may also notice more carb farts for a longer period for the same reason. Trying to set your tune to eliminate carb farts that occur under cold conditions is likely to lead to excess fueling. Be sure to warm up the engine. | + | A) Even when tuned correctly, cold engines are more likely to have carb farts than after they warm up. It is easier to create a lean condition when you open the throttle and gulp a large amount of cold air. If you ride off while the engine is still cold, expect to have farts. When the outside temperature is cold, you may also notice more carb farts for a longer period for the same reason. Trying to set your tune to eliminate carb farts that occur under cold conditions is likely to lead to excess fueling. Instead, be sure to fully warm up the engine before tuning. |
| B) You __should__ need the enrichener to start a cold engine. If you don't need it, your carb settings are too rich from the start. Go back to the general tuning stage and get this corrected before looking at carb farts. You may not have carb farts if you are that rich (which is not a good solution). | B) You __should__ need the enrichener to start a cold engine. If you don't need it, your carb settings are too rich from the start. Go back to the general tuning stage and get this corrected before looking at carb farts. You may not have carb farts if you are that rich (which is not a good solution). | ||
| - | C) HD added an Accelerator Pump on the CV40 in 1989 to help minimize carb farts by squirting extra fuel into the carb when you first twist the throttle. However, the EPA settings on the carb create a general lean condition which tends to increase the problem. This is another reason to do a proper tune on the carb, getting the overall Air-Fuel-Ratio (AFR) right, before addressing carb farts. Be sure the Accerator Pump is squirting a good spray into the carb, directed at the needle. | + | C) HD added an Accelerator Pump on the CV40 in 1989 to help minimize carb farts by squirting extra fuel into the carb when you first twist the throttle. However, the EPA settings on the carb create a general lean condition which tends to increase the problem. This is another reason to do a proper tune on the carb, getting the overall Air-Fuel-Ratio (AFR) right, before addressing carb farts. Be sure the Accerator Pump is squirting a good spray into the carb, directed at the needle to break up the stream into a spray. |
| Every carb and engine is slightly different. Pay close attention to when & how you are getting carb farts. Use a thorough and patient approach to finding where the problem is located and choosing the right solution. | Every carb and engine is slightly different. Pay close attention to when & how you are getting carb farts. Use a thorough and patient approach to finding where the problem is located and choosing the right solution. | ||
