When I hit 35 or so I loose a lot of compression

[Juicyjayocean]

And my engine makes a weird noise like a scrape sound it's something to do with the cylinder because I changed bottoms already and it still does it I think I might switch back to my stock piston see what happens

 

[Chainlube]

Are you sure it's not just 4 stroking?

 

[Juicyjayocean]

Honestly it might be

 

[Juicyjayocean]

It sounds different then what 4 stroking was on my dio Zeda 80 but now that you mention it it's probably that

 

[Axl Myk]

It could be backfire.

 

[Chainlube]

I'm way past 35.........oh wait, you're talking MPH.

 

[DAMIEN1307]

When I hit 35 or so I loose a lot of compression​

I'm way past 35.........oh wait, you're talking MPH.

Everytime I lose compression like this, it's usually called a fart...lol...lol.
By the way, after a certain age, NEVER trust a fart...lol.