Reply To: Carby 250 dies when choke turned off
I don’t have compression test gauges but wouldn’t mind investing in some. Do you know what size/pitch type fits the plugs? The engine won’t rev to full throttle – it dies if I try get to 1/4 throttle. I am curious, how would the comprssion test results aid in determining an issue? Cheers,
Start it up and keep it running (by any means) until its hot for 10 minutes.
Take out both spark plugs, then fit one compression tester probe in to front cylinder, twist full throttle and press start for 5 seconds to get a reading.
Then wait for starter motor to cool down, repeat again on the rear engine.
Make sure battery is fully charged, as slower spinning cranks will give false positives. (unless starter motor itself
Amazon Prime, get one that says USPRO compression testor. Connect the “straight metal” pipe. ignore flexi tubes etc…
Now hold it down to the plug hole hard.