You Must Do This With Your 80cc Engone Before Your First Ride!!! 

Looks more like a 50cc

I agree. The metel expands in the heat and contracts when it cools down. Tightening down the bolt while it's hot can cause a crack in your block as it cools.

Agreed. Loctite is a much better option

At rt torque when engine is cool!!!! Will be fine!!!

I know I just recently did my first build and now waiting on second motor to do my wife a build and put a car seat or something on it so the daughter can ride too

Just don't tighten up the bolts while the engine is HOT and RUNNING ,,, let it cool down first,,, THAT is how you do a COMPLETE heat CYCLE !!!

@Garage 250 Yes, parts expand and contract during temperature change; that's why nut and bolts have specific torque specifications and should be torqued at room temperature (the neutral state) so that when there is a rise or decrease in temperature there is room for it to expand or contract. This is why it is necessary to bring an engine to normal operating temperature before putting it under load; all of this is considered when specifying the torque value from the factory. If you over torque and there is an extreme temperature either hot or cold the parts will be past their limits and something must give, usually at its weakest point. For instance a warped surface or a crack in the parts and so forth. By over torqueing, the life expectancy will be greatly diminished. There is no need to put undue stress on parts that were designed to work within their limits. I know a lot of manuals say to check for things that may become lose during normal use. but that's to prevent mechanical failure and or bodily harm. If any repairs are done that were not to factory specifications the warranty becomes void. if you still believe you are right then so it be, I'm not here to put you down... I'm just giving the laws of physics. Take care and be safe.✌

@@treetops665 Best answer yet 5 stars.

Please just don't, misinformation

It would indeed be helpful if the info was correct.... but it's a shame I can picture this is gonna be a case of 'the blind leading the blind' LOL.

@@user-kc2ru5xo4k what info was incorrect so I know where I went wrong?

@@blargh6143 don't tighten down any bolts or fasteners whilst it's hot, ALWAYS allow it to cool down first, otherwise you will snap the bolts.

@@blargh6143 tightening the bolts while the engine is HOT & RUNNING (metal expands when hot & vibrating is putting stress on bolts as is) when your engine cools if the bolts don't snap the gasket surfaces will shrink apart and it will leak worse than the titanic !!!

Tightening up the bolts should NEVER be done while it is running and hot 🔥,,, good way to easily snap your bolts or warp your gasket surfaces... Run the motor, let it COOL down,,, THEN tighten up the bolts !!!

Yeah, if you warm it and tighten your destroying the threads In the aluminum head, never tighten when hot or running. That's a bad move, this video showed nothing good.. instead of tightening the bolts why not put lock thread(blue) in them, and tighten to specs.

Hi! I appreciate your input--truly. One of the objectives of this channel is to discuss builds and methods. I completely understand your view and concern. Personally, I have NEVER had a stripped threading from this engine. Not on the intake, exhaust, or jug. Yes, I have swapped exhausts after use--and the treading is still very secure. Of course one shouldn't Popeye the bolt when tightening it cold or warm, but I have not had a blown gasket, air leak, or oil spray from the jug since I have been doing this. Once again, I understand your POV, but I personally advocate for this process. Thanks for watching and being a part of the community!

9 times out of ten you are correct

YOUR RIGHT NEVER EVER TIGHTEN BOLTS ON A HOT ENGINE

Or snap the studs.

Please let your motor cool down first...

Yes. It seals the gaskets. Just don't over do it or the bolts could snap. Just make it snug. You'll only have to do it once. Have fun and happy building.

@@SouthernCustomCC thanks and super video

@@SouthernCustomCC the bolts would only snap if you're a clown and tightened it when it's hot.

Eric Ellquist the bike in this video is hyper 7 speed beach cruiser aluminum frame Wal-Mart sell $174 some aluminum frame can't handle the speed and vibration of road and that motor and crack if u look gastank frame bike some of those crack i like the black hyper it has metal frame. Huffy nel lusso will crack where that rear rack is welded the frame

On the engine mount fastners and studs, yes! Thanks

@@SouthernCustomCC but tighten bolts while the engine is HOT and RUNNING ??? NOT one single certified mechanic would EVER recommend THIS !!!

Hello: Sorry, I do not. However, Amazon has mz65 clones for $50 with free shipping if interested. Best of luck

Do u know why studs are better than bolts ? A lot of people don't....

@@user-kc2ru5xo4k For me personally it has stronger clamping pressure and helps prevent stripping bolt hole. Especially for something like your exhaust that puts a lot of weight and stressors on the bolts especially repeated taking on and off.

@@JamesPicconeclamping force is in fact identical between bolts and studs.... not so much with the lower torque setting of our 2 stroke heads, but with the higher clamping forces required in a head bolt application in a traditional car engine, when tightening down bolts, the bolt threads actually 'catch' inside the block hence causing the bolts to twist and inconsistencies, this is why oil is applied to head bolts when tightening down. This does not happen when using studs as the point of applied force is at the nut external to the block material...

@@user-kc2ru5xo4k cool , in my experience with motorized bicycles studs are more reliable and stronger.

Did you break your bolts ? Good chance you would've if you listened to this tool and tightened them whilst they're hot.

Nah, I didn't tighten them too hard while hot, just I tiny bit to keep it from vibrating loose@@user-kc2ru5xo4k

@@unknown.5982 yea, you never wanna tighten or do anything while it’s hot. Let it cool, then tighten.

@@stleo6069 yeah, doing worry i know lol

Yes. You add oil to your gas mixture. It is a necessity!!!!

Southern Custom CC I was worrying I was going to blow the engine like my last one so I’m being extra careful once I seen it smoking I stopped riding it thinking I messed something up because smoke was coming out the exhaust I don’t have a stock exhaust on it

Honest question. By feel. I do mine to 12 ft/lbs when setting up the engine. When I retighten them, it doesn't add much. I have never had a problem with blown gaskets or threading with this method either. I appreciate your input and thanks for watching!

@@SouthernCustomCC Its a shame its a garbage bike. It doesn't matter what you do to it. It will need constant maintenance and fall apart within a year. Hey dont worry your friends and family will give you good comments though. I bet your mom told you you were special too. OMG! your going to hurt someone with this junk

@@rodgerstowell5703 it's obvious Mr Southern Custom has no idea.

@@SouthernCustomCC don't be cheap and get yourself a torque wrench !! They're not expensive.

@@rodgerstowell5703 why are you such a hater. If you take care of a stock kit they can Last Way longer than a year as you stated. That’s the point of the hobby, you need to maintenance the. Often and work on them. If it weren’t for that you would just have a Boring motorized bike that worked every time.

You might want to check that the throttle linkage and slide are installed correctly. I’d start there

@@SouthernCustomCC good day and thank you. Sorry for the late replay,I just got a part that order. Now I have one more thing to ask. it starts a fine when the choke is open but soon as you close the choke on it shuts right off? And thank you for your help

Your throttle cable end is installed incorrectly into the carbie plunger.

I fully agree. All.my builds i have replaced the bolts with studs ( called grub screws from your hardware store).

I agree. I use m6 grubscrews as studs.

Im a mechanic and I would prefer studs over bolts whenever possible. The difference is where the torque is applied. There is more chance of stripping the threads inside the component when using bolts as the torque is applied on the threads inside the component whereas with studs, the torque is applied at the stud and nut, reducing the chance of damaging the body of the component, especially if it's made of aluminium...

Lol they're all the same - crap.

Hey, thanks for watching, and your honest feedback on videos. I buy this engine in bulk from Alibaba. I have also seen them sold @ WISH and on eBay, but I can't attest to the solidness of those sellers. I truly like this engine because it has a little more torque out of the box and I have NEVER once had a threading, power, or gasket issue with this engine. It has an allan bolt set up as well as m8 studs (2019). You just can't put a high compression head on it. Happy building!

Matthew Cotton : I do them when people ask for them. Not many people want to spend the money for the extra parts. Anything in particular that you want to see?

@@SouthernCustomCC Yes the performance difference in action

Hey Jake! Thanks for watching. No, that is a single jug 80cc (69cc). These are actually more reliable and have a good amount of performance to them. I really like these, personally

@@SouthernCustomCC cool mine is 80 aswell and im still doing the breaking in on the bike

Thanks for watching. This is the Skyhorse 80cc (69cc) engine. The 50cc looks similar, but this has the 47mm piston. Happy building!

No, it's a newer 2018 model Skyhorse engine with a 47mm high hole piston. Yes, it is a single piece jug--which means you can't put a high compression head on it--but this engine is much more reliable and has better torque out of the box than the other PK and Zeda style engines.

@@SouthernCustomCC isint the jug head the smaller engine the 50cc?

If it's a 47mm piston then it's a 70cc. A 49cc has a 40mm piston

The head and jug off the BT100 are not compatible with the 80cc counterparts because the bolt patterns are different. The bolts are further apart.

@@user-kc2ru5xo4k Thank-you very much for your help 😀

You can put a yd100 jug on a bt100 because same size piston and cylinder bolt pattern... 80cc are about a 3mm smaller piston and smaller bolt pattern !!!

@@jeremiahdssdentmorgan3341 Thank-you very much for your help and information, 👍😀 this is the type of information I was after... 😎👍

@@dawvidben-huir8101 you're welcome,,, I've been doing these kits for a few years now,,, much easier than adapting chainsaws to run bicycles back in the day !!! And I just try to share what I've learned over the years,,, glad you found my info useful...

Explained with incorrect info.

@@user-kc2ru5xo4k deflicted chompers!

Why would u do that ? Fins gives you extra surface area and extra surface area gives you extra cooling. A good mod to aid cooling is to cut slots into the fins to add to the surface area.

@@user-kc2ru5xo4k well, i have 3 of these 2 stroke engines now, the black 80cc engine i cut andfiled down the fins to make the engine look smaller, but also i want the engine to glow red. its fun, adios.

@@alanssnack1192 ok whatever gets u thru the night.

@@user-kc2ru5xo4k Rike

I'm genuinely curious what you would recommend?

Not as big a polluter as the shit you're spewing on these 2 stroke videos comments. Long live 2 strokes, 4 strokes, and ebikes.

You're incestuous

@@sergioavalos5288 here here sir.