First build-Got any motor reliability tips?

Discussion in 'Pre-Motorized Bicycle Information.' started by Rideout, Nov 29, 2017.

  1. Rideout

    Rideout New Member

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    Hi,
    I've decided to build my first motorized bike over the winter. Since I'm in no rush to complete it, I want to take the time to make the motor as reliable as possible. I'm sure the motor I chose isn't the greatest but it was only $89. I bought this 80cc kit from Banggood.

    The motor mount studs were pretty bent when they arrived so I bought the BBR tuning 20 piece heavy-duty stud set. I know I should have gone with 8mm studs but I don't have a tap set so figured this was the next best thing.

    The BBR stud set also came with head studs but I'm hesitant to swap them out. I have a tendency to overtighten everything. I'm always snapping bolts and tools.


    So I got some questions:
    • I didn't use Loctite on the mounting studs, should I have?
    • What is the correct torque specs for the head bolts and should I use Loctite?
    • Should I replace any gaskets?
    • Is there anything else I should do to the motor while I have the time?
    Thanks in advance





    PS-I hate to be the guy that asks the same questions that have been asked 100x. Prior to making this post I searched the site for these specific answers but didn't come up with anything. If these have already been answered then please point me to the post.
     
  2. Dan

    Dan Staff
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    Howdy Ride out, welcome.

    I use loctite or cheap nail polish and most defiantly on studs. I use automotive studs from a hardware store. Cheap and made for just that. Going exotic or high end is not bad but kinda a waste, IMHO.

    Don't know of any specific torqes. But takes a light hand and ya do get a feel for it. And check mounting regularly.

    I'd suggest reading threw the maint. and tips. Many opinions but lots of consensus, too.

    Best of luck and ride safe!
     
  3. crassius

    crassius Well-Known Member

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    I never use loctite because the bolts stretch rather than the nuts come loose. Torque for 6mm studs & bolts is 6 to 8 ft/lb, 8mm studs & bolts is 10 to 12 ft/lb. Keep everything tight and adjusted carefully, as things will work loose and/or bend over first few weeks - no way around that.
     
  4. Dan

    Dan Staff
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    Wow, just saw that price. Suweet!
     
  5. Dan

    Dan Staff
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  6. MEASURE TWICE

    MEASURE TWICE Well-Known Member

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    The set screws on my 5/8 keyed shaft I use a green thread lock and it is easy to unscrew with a bit of effort when servicing. It holds otherwise.

    I have had one half link I use on one of two chains 35 type have the tiny cotter pin break a piece off. The chain was intact and the link did not come out. I am wary of the cotter pin and am looking to still use a half link, but if it is not pressed on link (if they make them that way), then maybe a small circular piece of wire, like siezing wire I use on and boat anchor bolt pin, except way smaller.
     
    Dan likes this.
  7. Rideout

    Rideout New Member

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    Thank for the response. I've never heard of the nail polish trick. I'll have to remember that.





    Thanks for the torque specs. I recently read a post somewhere talking about how the heat generated from these motors causes the aluminum casing and the bolts to expand and contract. Your opinion on not using loctite makes perfect sense.
     
  8. Rideout

    Rideout New Member

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    I know! It was too good of a deal to pass up.
     
    #8 Rideout, Dec 1, 2017
    Last edited: Dec 1, 2017
  9. Rideout

    Rideout New Member

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  10. allen standley

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    Rideout from Maine Welcome! You close to Bangor?
     
  11. Rideout

    Rideout New Member

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    I use to live in Bangor back when I was in college. I grew up an hour north of there. I live in Eliot now. About 3hrs south of Bangor.
     
  12. allen standley

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    Good Luck to you and again welcome aboard1
     
  13. Rideout

    Rideout New Member

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    Thank you
     
  14. MEASURE TWICE

    MEASURE TWICE Well-Known Member

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    I know heat it used to loosen bolts and nuts that thread lock was used on. I guess I added non-engine parts to reliability, the jackshaft that is, this is where I used the thread lock. It still may get some heat but not nearly like an engine.
     

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