Is my engine blown? By ken727 (Read 341 times)

[ken727]

I'm getting spark, but switched all the spark items anyways to be sure. The engine seems to not be making suction for the fuel pump.
I pulled the plug and looked inside.. I see the piston pumping. I tried to suck on the vacuum line to force in fuel and it still wouldnt start.
It's a friends. He bought it new. It's at 750 miles and he never changed the oil.. from the manual it should have been done 3 times by now. I'm pretty sure it's the engine. Just want to be sure.

[cyborg]

Check compression,,with a screw in gauge if you have one or can get a loaner,,oreilly or autozone loans tools but a deposit is required that's returned when you bring to tool back un damaged ,,if no gauge put your finger over the plug hole and hit the starter there should be a sizable pressure that'll push your finger off the hole,,,or gauge should have at least 100 psi to be considered healthy,,get 130-140 engine good and I would be looking at fuel delivery if you have a decent spark,,,as you said he probably burned it up by not paying attention to the oil

[ken727]

Okay it is definitely blown. When I put my finger over the sp as ro plug hole to see if there was any moisture or smell for fuel there was zero suction

[cyborg]

Bummer,,if the lower end checks out ok just put a new piston and barrel on it

[ken727]

Dec 19, 2018 7:19:04 GMT -6 cyborg said:

Bummer,,if the lower end checks out ok just put a new piston and barrel on it

See I used a bore hole inspector. I could see the piston moving and the crud on it. I could not see a hole like I did in my corolla when it blew right thru the center. All it will take is a piston and what's a barrel a sleeve?

[cyborg]

The barrel is the cylinder,,,most scooter parts supply houses have matched kits,,,parts for scooters is good