84 200m wont start

[J trike]

I'm trying to start this 200m I got for a $100.
I have fresh gas and a new spark plug and even a new carb installed.
I have spark and getting gas but absolutely no ambition to start.
It turns over rather smoothly so I wonder if it's a compression issue...
What should the compression be?
Any suggestions?
Thanks
Is it the carb I'm not adjusting properly?

[Georgiabii]

I'd suggest a compression test. You can get them cheap frog harbor freight or borrow from a parts store. I would want to see over 100 psi with the throttle held open during the test.

[J trike]

Tested it today and all I have is 40 psi.
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That probably means rings are shot or maybe a stuck valve???

[swapdip]

Maybe, or it might have jumped time. Worth a look

[ps2fixer]

Yea I'd say check the timing first thing.

You can do a wet test to see if the rings are at fault (put a little oil down the spark plug hole and do the compression test again). If it jumps up to a fairly normal value, pretty good chances it is the rings since the oil will help seal them for a short time.

If timing looks good check valve adjustment, too tight could make the valves leak and loose compression.

[gimmeamidget]

I agree with valve adjust. 40lbs seems too low even with bad rings.

[J trike]

Much appreciate the suggestions. I'm trying to learn as I go so thanks very much.
Hope I can get it running!