Flyboy Dave

My Feedback: (21)

Great....glad to help.

FBD.

josemiguel1188

Hi guys, i own the same motor and came without bolts.
Any 3.5mm fit on it?

Y found this ítem on ebay
Item nro 404410155151

and these on aliexpress
/_mNTyQjc

What do you think?

Flyboy Dave

My Feedback: (21)

https://www.ebay.com/p/1600207577

1967brutus

If the muffler or header allows, your engine will be best served with two M4 hardened steel grubscrews of sufficient length that they can serve as studs.
Screw the studs into the engine first (loctite is an option but not necessary) then attach the muffler or header and tighten down with nuts and lockwashers (Nordlock or similar).
That way, the thread IN the holes in the engine are not subject to wear and they will basically last forever.

Normal bolts, when tightening, the steel bolt will move in the aluminium threaded holes under tension and friction, rapidly wearing out the thread and the result will be stripped threads. With insufficient bolt length, this friction will be on only part of the threads, worsening the issue.
Studs, the wear and friction will be between steel nut, the threaded holes will ONLY be subject to friction, but the force will be devided over the full availlable thread length, without any friction or wear.