Why does my 1989 suzuki 250cc quadrunner have no compression?

Hey Marty,
An internal combustion engine requires three things to run..(if all the internals are good)..
1. A properly timed spark.
2. Adequate compression (>120psi).
3. Proper air/fuel mixture.

Start by eliminating one of these at a time...(get a professional to clean and set the carb), install a new spark plug. Get a new fuel line.

Here ya go Tony...

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Suzuki QuadRunner LT F250 F250F LTF250 Manual
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You seem to have many problems with this ATV reading the different postings have you checked the compression on all 4 cylinders if so what were the readings ?

adj valves ? prolly why!

If its a 2 stoke,"takes gas oil mix", piston in backwards,, ,,,,if its a 4 stroke "takes gas only"...rocker arms need adjusted, or cam not set in proper place during resembly "out of time". Or a. Bent valve/valves,,,in the head, valve will have to be replaced

Hey Anon,, WHY are you needing to replace the carb?? In my 40+ years of being a motorcycle/atv mechanic, I have only replaced 3 carbs,,,and CLEANED and repaired HUNDREDS AND HUNDREDS. reply to me on here.... I'll help you

you can either use RTV silicon or JB weld for a permanent fix

bad rings, bent valve, bad valve seat. make sure your oil pump is good once you figure out too.

I have a 87 quadrunner 300 how do I adjust the valves it has 4 2 on intake and 2on exhaust