Are there two different size spark plugs on the bike?

Could you comment with more specific information about the bike. Make, exact model, engine size and year of manufacturer. This will help when looking for the manual.
Servicing a bike is usually the same for every make of bike. Oil filter on the side of the gearbox housing. Fresh oil. Air filter high on the side of the engine. New spark plugs. Fresh oil and check the brake pads.

No put anti siez very very little on both plugs after gap is checked and reinstall them.. Resistance messurement will be all over the place on spark plugs due to connections with multimeter

Hello,

After doing a bit of research on your bike, I found that the recommended spark plug gap should be 0.6 to 0.8. Apparently this gap size is standard for several different engine sizes and models.

Not knowing the exact engine size, I cannot be absolutely sure that the above information is correct for your bike. If you have a users manual, it should list the correct gap.

Hope this helps.

If you find this information useful, please vote on this post. Thank you.

Regards,

Oz

Did you put different size sprockets on?You may be hitting the rev limiter

Hello, I don't know what size the socket you will need, but an easy way to find out is buy the spark plug(s) that is recommended for your bike, then go to an auto parts store with your plug, and find out what size socket you will need.

Just follow your owner manual book. There are many sizes/types of spark plug in market with different applications.

SPARK PLUG (DPR6EA-9) (NGK)

Check the owners manual, a lot of pocket bikes have different size spark plugs.

if its your first time you need a haynes repair manual.you need a spark plug boot puller.you need 3/8 ratchet wrench.spark plug sockets.from size 5/8 to 13/16.you probably need size 5/8 socket.you need extensions different sizes.and universal joints.to reach hard to get plugs.you need torque wrench. and spark plug gap set.

Yes it is. (It could be 3/4 or smaller depending on the spark plug)