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    A Different Perspective On Transmission Oil

    "They say a stock Harley trans will handle between 100-150 HP, before something lets go." Easily. I built a Shovelhead stroker that would launch in second gear, I never put it on a dyno but the horsepower was such that keeping spokes in the back wheel was a chore. The only thing on that bike...
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    Anyone in here have a bike that still has carbs?

    To some extent, the amount of trouble you might have depends upon the carburetor (they don't all corrode or gum up the same, believe it or not,) the local climate, and the quality of gas. But if you add the recommended amount of Stabil and run the bike on that gas until it's in the carburetor...
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    A Different Perspective On Transmission Oil

    I just took the top off a 4-speed Shovelhead transmission that I built in 1992. I have no idea how many miles are on the gear set because the bike didn't have a speedometer for about 15 of those years, but I know the bike got three top end overhauls during that time, was flat worn out at the...
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    Axil Ear Pro

    https://goaxil.com/products/gx-extreme Anyone here tried these?
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    Filter efficiency vs. effectiveness

    As air filters go from brand new to slightly dirty they become somewhat less efficient in terms of possible total flow but they become more effective at filtering out the smaller particles. According to the service clinics I attended it's better to not change an air filter sooner than...
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    SAE50 vs. SAE60 Flow Characteristics At Temperature?

    Thank you, this is the info I was looking for. The back story is I was working on a bike (5-speed Evo Harley) that the owner had put BelRay gear lube in. I've seen pretty impressive results from BelRay in terms of quieting things down, but this bike has an intermittently leaking main drive...
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    SAE50 vs. SAE60 Flow Characteristics At Temperature?

    If we assume two straight-weight conventional oils, same manufacturer and brand, the only difference is one is SAE50 and one is SAE60, what will be the difference in flow characteristics at 125 degrees Fahrenheit?
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    Another Oil Mixing Question

    I'm not concerned with the properties of either oil, as long as there is enough ZDDP and the oil meets the recommended requirements for viscosity and service conditions, it is beyond doubt for me based upon the number of HD engines I have rebuilt that any modern oil is going to be OK. These...
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    Another Oil Mixing Question

    Thanks. I would never want to do anything bad to anybody's bike but I also don't want to go buy Lucas when I keep Mobil1 on the shelf.
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    Another Oil Mixing Question

    Harley Evo, owner has Lucas 20w-50 synthetic for V-Twins in it now. Is there any sound scientific reason why Mobil1 20w-50 for V-Twins should not be used for top-up until the next oil change?
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    Started bike without oil

    The chance that any significant damage happened -- anything you'd ever notice -- is vanishingly slim. The fact that you stayed at an idle and it was less than minute . . . I've seen motors subjected to a lot worse than that and they survived just fine. Ride it, don't worry about it.
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    What permanent thread locker for 2" diam. threaded shaft?

    It depends upon how permanent you mean and if you can heat the parts for disassembly if needed. If it's really permanent, I have used a lot of Loctite 680 for larger threaded connections in critical applications, it hasn't failed yet. But assembly does require heating the threads until the...
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    Door hinge

    Before you do anything to the hinges, check all of the screws, make sure they are tight. It's common for the screws at the top of the jamb to come lose over time. Then, assuming it is a three hinge door, pull one pin at a time, swing the door, see if it squeaks, and see if there is any...
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    Conventional 20W50 For Harley Davidson

    Harley engines are air cooled, this is true, but it is only partially true. They are also oil cooled, this is something that was emphasized in factory school guidance to dealerships. If you think about these being dry-sump engines with an external oil tank and you think specifically about how...
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    A Question For Machinists on Rethread (Chaser) Taps

    I've got a good set of rethread taps and dies AKA thread chasers, and I understand why it's not a good idea to use a regular tap to clean up an existing threaded hole. The set only goes down to M6 and I need to clean up an M5 x 0.8 hole. I have had no luck finding an M5 thread chaser. Would...
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    Conventional 20W50 For Harley Davidson

    A little more background on oil selection for V-Twins, folks who were riding when Shovelheads roamed the earth may appreciate this. A Harley V-Twin, at least until the advent of the Twin Cam, is basically a slice out of an aircraft radial engine. Close enough for our purposes here, anyway...
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    Conventional 20W50 For Harley Davidson

    I've rebuilt a lot of Harley engines over the years and had the chance to observe a lot of riders using a lot of different oils over time. Barring egregious foolishness (like the guy who ran the cheapest 10w-30 he could find or the guy who ran gear oil because it was heavier and therefore...
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    Any Metallurgists? Quench Advice For Steel

    OK will do. And will report back here on the results.
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    Any Metallurgists? Quench Advice For Steel

    Original wristpin diameter is 0.792", it has been ground on one end to get a U profile so it can work as a gouge, the other end that is still round has a mild steel slug welded into it and that slug is welded to a piece of 3/4" black pipe for a handle. If I take the steel to be hardened up...
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