Yamaha aerox advice please

[tmmv1]

Hi All. I am New to the forum.
I  am looking for some advice regarding an Aerox 50cc 2013 moped i recently purchased.
The bike was bought as a none runner and needing some work as it difficult to start and when it does start it goes to about 15mph and hits a flat spot and wants to stall. I took the head of the moped to see what size the piston is and after checking online the moped has had a 70cc top end upgrade fitted, one of the problems i now have is finding what make the upgrade is so i can fit a head gasket set to fit and way of telling what make it is would be great please. I can add photos if needed. My plan is to buy a new carb as i dont know what the previous owner has been doing to the carb. Any advice or pointing the the correct direction of what head gasket set i need would be grets thanks.

[aeroxbud]

There should be some marking on the barrel if it's a good quality head. This will tell you who made it. If it's a stage 6 cylinder it might just have a couple of stars and 49cc on it.
If it's a cheap kit from somewhere, you might be better off buying a replacement 50cc kit of a better quality one.
Are you in the uk? If you are Pedparts will sell replacement gasket kits. www.pedparts.co.uk/bikes/yamaha/aerox-2013-on/pistons-rings-engine-gaskets?by=&dir=ASC&limit=30&

[tmmv1]

May 16, 2023 14:49:56 GMT -5 aeroxbud said:

There should be some marking on the barrel if it's a good quality head. This will tell you who made it. If it's a stage 6 cylinder it might just have a couple of stars and 49cc on it.
If it's a cheap kit from somewhere, you might be better off buying a replacement 50cc kit of a better quality one.
Are you in the uk? If you are Pedparts will sell replacement gasket kits. www.pedparts.co.uk/bikes/yamaha/aerox-2013-on/pistons-rings-engine-gaskets?by=&dir=ASC&limit=30&

Hi. Cheers for the fast reply and help its really appreciated
Yeah i am in the Uk. I am begining to thing what you have suggested with regards to getting a 50cc kit is a good idea as the 70cc kits thats currently fitted has no markings on at all   im sure by the look of the exhaust that could be an aftermaket exhaust to/ Hopefully this will fit onto the 50cc kit i get? 

[tmmv1]

I have attached a few photos of the engine barrel and head, maybe on off chance someone can tell me what head gasket set i need, before i go back to a 50cc kit.

[Lucass2T]

It looks like a stock 50cc head on a 70cc barrel. Barrel looks like cast iron.
I think its a cast iron Airsal kit.
Look at the shape of the combustion chamber.
The coolant connection on the cylinder will be the givaway.

It's not a top perfomances trophy, they have markings on it.
The stage 6 street has 49mm stamped on it. DR kit has 'DR' stamped on the side, so not that one either.
Might be a cast iron Barikit.