DIY Gy6 Scooter 50cc to 80cc/How To Install 80cc Kit On GY6 Engine (Sprint Basic) 

Bro it damages valves if you want to get 80cc you need to replace the head with one that has bigger valves

@@ismailmehmeti4208it wil fit

@@ismailmehmeti4208i want to install a 70cc kit is it okay then with original cylinder head?

@@pinnupunnu258should work

are they setable by hand? how are they tuned

You tune the valves with a valve lash feeler guage, look up valve lash setting on mopeds. Its very, very easy to do brother. ​@hash-CCFF00

​@hash-CCFF00 you can't really feel the inside where the valves open inside the cylinder head, but when the piston hits top dead center it'll strike the valves if the clearance isn't right. You'll hear/feel it.

you really don't need to do that but you can used reg motor oil if you want

prolly 50-55,but i’d def recommend changing the roller weights and going with a performance cdi too just to help with accelerating and top speed

@@-TD227 good advice. I had a 50cc engine that was not running right out of the box. I thought bad rings or valves. Since it was under warranty, they sent me a new one. One day I decided to tear it down and see what the problem was. The whole problem was the timing. It was off by 2 teeth. So I decided to rebuild it into an 80cc. Fired up on the first try. Definitely can feel the difference. Gets up to 40 within half a block. The 50cc got up to 43, but it was a struggle. Had to be flat, smooth pavement. No wind and you needed a good 3-4 blocks of running just to get there.

@@grazz7865 yeah i’ve currently got a 50cc that i’m gonna 150 big bore kit swap so that it’ll keep up with traffic a little easier

@@-TD227 sounds good. I believe you may have to change some of the mounts for a 150. The 150 mounts on the bottom whereas the 50 mounts on top. Anyway, good luck with it. Let me know how it goes.

@@grazz7865 just got in the performance kit,it was fairly easy to install but there were 2-3 mounts that i had to mess with but overall it was definitely worth it over the 50cc the top speed is right around 60-70mph when before with the 50cc i’d maybe get 35-40 on a good run and on cold days it wouldn’t run much over 20-25 now im running 60-70 on warm and cold days which is an amazing upside

The original crank can be used up to like 70cc more than that and you're risking engine damage

I think its euro kit like one on cg125 euro2

That is to take any oil vapors back to the oil pan. A ventilation tube, cars also have that

You’ll power wheelie at low speeds

On the vacuum fuel pump

merci bien de vos connaissance bonne journée a vous @@sam6554

How? Genuine question here. If the stroke remains the same with the same con rod, then that should increase the capacity with bigger bore. Unless the piston is taller? What do I miss here?

139QMB engine stroke is 41.4mm. Cylinder volume formula is v=π r² h. Do the math.

They rounded to 80, actually is 72. Still,its worth it

Yes it is

Becuse of belt

@@marin_xhafi true,but he needs to get a bigger carburator,new rollers,variator,when he gets that he will achieve top speed!

@@dariokozul4883 I'm sorry to ask you a question. I put an 80cc engine from a 50cc to my scooter, except for the valves and the carburetor, but it has no power and it blows gasoline into the air filter. What's the problem?

​@@marin_xhafi wrong timing