Specs needed for 97cc 2.8HP engine bolts length, thread, wrench Size?

[ridewithlifan761]

I'm currently tinkering with a 97cc engine that has a 2.8HP output, and I could really use some help. I'm trying to nail down the bolt specs, does anyone happen to know the length of those bolts, the thread pitch (inches), and what size hex wrench I'll need? Oh, and are these bolts SAE or metric? I'd really appreciate any info you can share

 

[EllenG]

Those small 97cc engines like the ones on mini bikes or go karts usually use metric bolts, not SAE and most of the common mounting or side cover bolts are M6x1.0, usually around 20mm to 30mm long depending on location. The hex heads typically take a 10mm socket or 5mm Allen if they're cap screws
Hope you find this helpful enough

 

[oldking56]

@EllenG 's right, though for me you'll likely need hex wrenches between 8mm and 13mm depending on the bolt. If you tell me which bolts exactly, i can maybe help pinpoint the sizes for you