New 2-stroke engine won't start

[Wrench]

Wrench
Merry Christmas and Happy Holidays my Brother!

"Mele Kalikimaka" Braddah

 

[HumanPerson]

Roger that!

 

[HumanPerson]

hows that rad doin for ya so far brother?

 

[Wrench]

hows that rad doin for ya so far brother?

Rover is awesome. I love it. Too many trails and not enough time.

 

[Greg58]

What I was going to say when referring to the BP6HS is that is the plug type I run on mine, I’m running the BP5HS. Even with the extended tip it’s no where near the piston.

 

[DieselTech]

Good point @DieselTech. The plug didn't look smashed in any way... Perhaps the positioning of those dents in the top of the cylinder is a coincidence. I'll pop it open tomorrow for a closer look.

Did you get the top popped today? Curious if/or what you found?

 

[Dood Surfston]

Yeah I opened it up and took the jug off too.

You're right that there's no way the piston was hitting the spark plug, so must have been a foreign object.

There were tiny particles of metal on the piston, but nothing obvious that could have those indentations I showed.

Weird thing is it looked like there hadn't been any combustion at all in there. Spark plug was clean, and no carbon residue anywhere

 

[Chainlube]

Yeah I opened it up and took the jug off too.

You're right that there's no way the piston was hitting the spark plug, so must have been a foreign object.

There were tiny particles of metal on the piston, but nothing obvious that could have those indentations I showed.

Weird thing is it looked like there hadn't been any combustion at all in there. Spark plug was clean, and no carbon residue anywhere

I don't know if you did a pre-installation inspection or not, but some nicks and gouges come from handling at the factory. Your nick could have been there all along and you just never noticed until it wouldn't start.

 

[Dood Surfston]

True, that's entirely possible.

I'm going to check the compression again. Went to the automotive store today to see if they had a compression meter, but none in stock, so I ordered one for Monday.

 

[Wrench]

\

Yeah I opened it up and took the jug off too.

You're right that there's no way the piston was hitting the spark plug, so must have been a foreign object.

There were tiny particles of metal on the piston,

If something was in the cyl it's probably been blown out the exhaust