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    Engine idles fine, but dies when rev up :/

    Engine idles fine. But dies when rev up. At high revs sounds like is firing only every X combustion stroke. I thought it might be fuel delivery issue. I checked from tank to carb. No problem. I bough new carburetor. Nothing changed. I also checked timing. I checked valve lash. See for yourself...
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    Crack in engine body (non-pressure part), recommend some hack/solution

    Engine runs great, but has a crack that leaks like crazy. If not fixed, I will just scrap it. So any solution would do at this point -it can't be broken any further. I have only regular MIG/STICK welder for steel. Could it be repaired? Or could I somehow hack my MIG a turn it into aluminium...
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    Airless spray gun - Is it any good?

    Seeing a lot of cheap (under $40) airless spray guns. Is it any good for painting things like motorcycle frames, DIY welded metal stuff (shelves, tables)? What type of paint does it use, can you mix color to your liking? Is it better than rattle can paint job?
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    What is this setup coming from an oil fill?

    Just saw this bike for sale and just wondering what is going on over there? Hose coming from and oil fill hole, going into a beer can and splitting into two.
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    Starting stopped working, but starter is spinning

    Starter on motorcycle. Three or four times it was hard to start motorcycle (but started) and then it didn't start anymore. (Kick start starts it. And motorcycle rides as usual. ) I checked relay and it is working correctly. Starter is getting full 12,6V when activated. And has good ground...
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    I can't get it to spark, ideas welcome

    The mess looks like this. The main point I think is, that it's not mounted on a frame. For example the body of coil won't be automatically grounded...and stuff like that. And current wiring looks like this. (I think it is readable?) I tried this (and variations of this, but the picture is...
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    Leaking spark plug, oily around

    Bought this 110cc bike 3 years ago. Has 45 000 Km. And except changing an oil there was nothing done to it. It rides as new! But I noticed this oily leak around the spark plug. On touch it is wet, like an oil mixed with dust substance. Spark plug is tight, can't make it any tighter. Should I...
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    How to fix or not to fix leaking brake caliper

    I just got this new rear brake caliper (no warranty), put it on bike and it is leaking. It is not really leaking, it is "soaking" through the metal. When I apply pressure on a break, it will leak right around the place where body meets the mount. I can't see any crack or anything. Brake fluid...
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    How do you tell you can weld this metal/bolt/part

    I have MIG welder with flux core wire. Often I'm not sure if I can weld some part/bolt/nut/piece of metal from scrap pile. I was trying to use magnet, this method somehow works. I'm also aware that welding some stuff can make dangerous fumes. How can I tell if I can weld it. And if it might be...
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    Importance of exhaust on 4 stroke engine?

    Silver exhaust is the original exhaust that came with the engine. But I run into a clearance issues. To solve it I will cut & weld two different exhausts together. Pipe on second one (black one) is a hair wider. Am I looking at any problems here? Except like loosing 5% of power, louder sound...
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    Cracked plastic fuel tank, possible repair method?

    Fuel tank is cracked right at the neck. Just under the thread to screw on the cap. It goes around 50% of the circuit. Usually I would drill holes, zip-tied it, put epoxy/glue around. But because of threads I can't do any of that. Do you have any idea how to fix that? I have hard time finding...
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    LED lights series or paralel

    I have barebone wirring harness where behind rectifier/regulator are no lights, horn, turn signals.... nothing. If I want to add LED light like the ones on the image (1 front, 1 rear, 1 switch), should I wire them in series or paralel?
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    Trying to getting run offroad 50cc (->to 100cc) motorbike

    Story behind it is, that previous owner converted this 50cc offroad minibike into 100cc by a bigger head (no idea if it ever run after this upgrade). When he was selling it he told me it starts (no idea if it's true). Head says "97cm^3 KFM-8" (which is a head from 110cc motorbike). And body of...
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    Does 2 stroke engine hold oil?

    I was looking at some small chinese motorbike today. It had oil drain plug on the bottom of engine. And fill cap with dipstick on the top. Does it 100% mean that it is 4 stroke? (At least that is my understanding - 4 stroke hold an oil and run on fuel. 2 stroke doesn't hold an oil and run on...
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