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    Sevcon Gen4 Size 6 72/80v 550A - $600 OBO

    Selling my Sevcon Gen4 Size 6 550A. Model number 634A85203. Bought this years ago for a project that never came together. It's mounted to a 1/4 inch aluminum plate with expensive Thermal Grizzly thermal paste. Not sure how much these are worth second hand just need the money. Asking $600 or...
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    Looks like this is my next project: Razor RSF650

    Seems like a plastic bushing. I haven't taken it apart yet but I have wondered about it also. I've printed bushings like that before so I can replace it but it might be worth checking if it's actually greased or not. Hasn't seem to have worn much if any yet. If you plan on using the original...
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    Looks like this is my next project: Razor RSF650

    Wanted to see just how much power could be squeezed into this bike. :bolt: Unfortunately I think the fairing would need modification to fit a Sevcon size 6. :lol: Maybe a size 2 or 4 would fit. Width is fine it's just a few inches too long.
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    Looks like this is my next project: Razor RSF650

    A lot of good points Dauntless. :thumb: Definitely a small bike for those speeds. I wouldn't recommend trying to commute like that. More of a thrill seeking thing... I also have a lot of saddle time on this bike. Found many of its limits at low speeds as I gradually upgraded it. By stable I...
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    Looks like this is my next project: Razor RSF650

    Preliminary results with the 14 tooth sprocket 47.0mph Closing in on 3x stock speed. :lol: I think I can squeeze another mph or two out. Went out in the rain and wind with a not quite fully charged battery at 73v. Also wearing my motocross gear just in case. Happy to report it ran smooth and...
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    Looks like this is my next project: Razor RSF650

    Good deal! Good luck on the motor purchase. :bigthumb: Regarding the shock, the eyelets are much heavier duty than stock and need a small amount of filing or sanding just to the flatten them a little bit top and bottom and then it's a direct replacement. When you get it you'll see what I...
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    Looks like this is my next project: Razor RSF650

    For science and stuff. Unite MY1020 650W stock Razor RSF650 motor Couple thousand miles on it. Still has a good amount of brush life left. That's about the best I can say about it.
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    Looks like this is my next project: Razor RSF650

    My main concern would be whether any of those motors have fans in them. Maybe you can ask them. I've never seen a fan before on an MY1020 style motor in all my research. I can tell you for sure my motor would be a steaming puddle of chinese copper by now if it didn't have one. Also be sure...
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    Looks like this is my next project: Razor RSF650

    Kv of the 48v 1800w version: 4500rpm/48v=93.75kv Kv of the 60v 2000w version 5600rpm/60v=93.33kv If the rpm specs are true it's likely the same winding in the same casing. Maybe you could get one, crack it open and find out for us! :bigthumb:
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    New Project " help Please" Honda st1300 Conversion

    Sounds like a Zero 75-7 motor would get the performance you want. It's not exactly a small motor though so you'd have to judge if there's enough space for transmission and motor together. You might be able to match the performance with a smaller motor but... where's the fun in that? Also, I...
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    Looks like this is my next project: Razor RSF650

    The freewheel sprocket is sandwiched by the main rear wheel sprocket. The bolts that are holding it in place lace through the freewheel teeth. Seems to have been a clever way to reuse a bulk manufactured bike part. I'll snap a picture of the chain tensioner mod next time I take it out riding...
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    Looks like this is my next project: Razor RSF650

    I'm ok with the rigid fork. Gives real precise steering. I've heard talk of adding pit bike forks but it wasn't worth the effort to me. If its not hydraulic or pneumatic dampened I don't recommend it for high speed use. Electricscooterparts has wide selection of sprockets. Any of them labeled...
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    Looks like this is my next project: Razor RSF650

    14 tooth motor sprocket is on order, hopefully sometime this week. 40mph is pretty stable. I thought it might get speed wobbles but that hasn't set in yet. Having a dampened shock helps it feel more controllable. I guess it depends on your needs. If you're only going 5 miles each way it'd work...
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    48v Lipo pack 13s temperature

    I'm curious what your exact configuration is? Is this multiple packs connected just in series or is it a parallel/series configuration? Trying to think of how one might build such a 13s 44ah pack with common rc lipos... sometimes a common mistake is adding AH capacity of a series only setup and...
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    Looks like this is my next project: Razor RSF650

    Yup mophorn 1800W. I'm definitely not pulling 1800W though, it would only run that power at 48v. Fully charged my pack is 75.6v so a cruising power of closer to 3KW. Yes I will be using this motor as I try to hit 50-60mph. I'm confident that it can do it because the power it still has at full...
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    Looks like this is my next project: Razor RSF650

    Don't know about that motor although it looks identical to mine down to the mounts and label. For that money a QS 138 3000W would be a much better choice. Try checking amazon for Mophorn 1800W 48V which is the one I have. It's currently listed for $98. Don't be off put by its 1800W rating. I run...
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    Looks like this is my next project: Razor RSF650

    The fan is built into the motor to my complete surprise. Seems to work very well. Reading reviews of kunray motors I expected it to overheat and the magnets to possibly fly off. Neither of which seem to be an issue on this motor. Maybe it's a new revision? I picked up the mophorm branded motor...
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    Looks like this is my next project: Razor RSF650

    New shock is an X-PRO 270mm gas shock. About the size, I'd consider it minimum viable size for an adult. I'm 6'2" 220lbs and can ride it rather comfortably with the bars just missing my knees in tight turns. Makes a hilariously nimble and quick ride with this kind of power. :lol: I'm a...
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    Looks like this is my next project: Razor RSF650

    If you're gonna be running it through any kind of weather I'd suggest treating the motor with red insulating varnish as well. Same applied to the stator side. Good info on the disk brake upgrade Dauntless. Stock brakes are barely enough at 40mph even when tuned just so. Hydraulic will be...
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    Looks like this is my next project: Razor RSF650

    I'd just like to add that I do not recommend upgrade kits or messing with additional 12v SLA batteries. I have a friend who went that route with severely lacking results. I view those kits as replacement parts not real upgrades. If you wanna go cheap mod the stock controller. The mosfets and...
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    Looks like this is my next project: Razor RSF650

    Great little bike! Picked one up middle of last summer exactly because it looked like a promising project bike. Put several thousand miles on it so far. I gradually increased the power with shunt mods and added an ammeter to the lid compartment. Took the stock motor up to 4kw with a modded DROK...
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