First build-Got any motor reliability tips?

Rideout

New Member
Sep 21, 2016
8
1
3
Maine
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.
 

Dan

Staff
Staff member
May 25, 2008
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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!
 

crassius

Well-Known Member
Sep 30, 2012
4,032
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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.
 

MEASURE TWICE

Well-Known Member
Jul 13, 2010
2,450
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CA
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.
 
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Rideout

New Member
Sep 21, 2016
8
1
3
Maine
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!
Thank for the response. I've never heard of the nail polish trick. I'll have to remember that.


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.

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.
 

MEASURE TWICE

Well-Known Member
Jul 13, 2010
2,450
542
113
CA
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.