2 stroke quad bike engine cutting out.

[TeaVR]

I bought my son a 50cc quad bike last Xmas. It has always been difficult to start, and on a bad day cuts out with out warning.

So, what are the obvious reasons for this (apart from running out of fuel).

Cheers.

TeaVR

[OJ]

Not sure what could be causing it (probably mixture from the sounds of things), but worth pointing out that running it out of fuel is VERY bad for 2-stroke engines if you make a habit of it.

[freddytin]

Always start with the plug on a 2 stroke, preferably a new item.

When changing the plug pause for a tea break once the old item is removed, giving the probably flooded engine chance to vent.

Edit. whilst you have the plug out, check for a reasonable spark by holding the plug cap with new plug inserted against the motor and cranking for a few seconds. Likewise test the compression with your thumb over the plug hole , shouldn't expect too much pressure from a 50cc , but expect little farty noises.

Edited by freddytin on Monday 17th November 12:35

[skid-mark]

check the mixture is correct, check there is no air leaks faulty gaskets, two strokes are prone to have piston and bore wear flooding can also cause the conrod connecting the piston to bend slightly which causes running faults, if the engine is new try starting it with the spark plug slackened off so its not under to much pressure then thighten when running or after its run for a few seconds then it should go on the first pull/crank.

[Pupp]

Check that any tank breather is working...

[paulw08]

is it a pull start

[TeaVR]

Yes, it is.

[julian64]

I can answer this with one sentence

Close the gap on the plug.

[TeaVR]

TeaVR said:

Answering on behalf of 911Dreamer, yes, it is.