![]() However, it's not simply a matter of increasing the spark plug gap and the output voltage from the coil. The bigger the spark plug gap, the more air/fuel mixture will come into contact with the spark and the easier it will be to ignite the air/fuel mixture. The spark plug gap also has a bearing on engine performance. The same applies when the combustion chamber pressure is increased. The bigger the spark plug gap, the more voltage you require to have the spark arc across the gap. Please do not give advise that could harm others whips.From:The spark plug gap, along with the combustion chamber pressure and the ignition timing has a direct bearing on the amount of voltage you require from the ignition system. This also applies to any ignition system using a coil and spark plug. Sounds like you have been doing this wrong the entire timeHere is a little info for you. Sound old school, why yes, so 'old timers' use to set the gap a little 'closer' but still in the accepted range.Nowadays, you have choices, and standard HD plugs are $8-$10 for pair so most do not even bother.just check gap in center of range and change out at 5000 rather than take time to 'preserve' the old plug. ![]() Range is provided for acceptable accuracy, with tolerance to take into account.the erosion that occurs the moment you put them in and use them for 5,000 miles, remove, check cleanliness, file flat, regap with wire guage (wear contacts are grooved). Changing to plus and wires that are not recommend will cause these checks to fail, and your bike will not run correctly. Remember that, and go by the service manual.040 gapthe plug that harley recommendsthe wire that harley recommendsthe torque you service manual call forMust follow steps.Harley has sensors that check the resistance that control sensor reading that affect the way your bike runs. Condition these are new, includes two spark plugs fits shovelhead 74ci and 80ci models evolution 1340 equipped model's ships to lower 48 states. 32189-10 Harley Davidson Motorcycle Spark Plugs Screaming Eagle (59.5% similar) No local pick up. Harley Davidson say's to replace the plugs every two years and why not give your bike the best plug out there. Performance High Compression Spark Plugs is rated 5.0 out of 5 by 2. '86-later XL and XR and Evolution® 1340 models equipped with Screamin' Eagle® Performance Cylinder Heads. My 1997 harley davidson softtail has a problem where it seems when the bike is warm the shifter sticks and doesn.įits '99-'17 Twin Cam-equipped models. ![]() We have a 99 harley davidson softtail and it has no spark only 2660 miles any ideas? Thank you - Answered by a verified Motorcycle Mechanic. I set mine to.040, and never had an issues.Spark plug gap does affect combustion, power used to create the spark, length of spark, and other things. They should come from Harley set to.040, but some are a little less/little more. Click to expand.If it is a new bike then, yes, set to.040 and go riding.
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