1988 CBR250 turning over but won't start, can't figure it out.

[OddDuck]

They checked that. It was ok.

Turned out it was a swollen/perished fuel diaphragm on the fuel cock that was causing the fuel flow to be irregular.

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OK - it's a pretty quick thing to check, hence the suggestion. Glad you found the source of the issue.

[jafagsx250]

OK - it's a pretty quick thing to check, hence the suggestion. Glad you found the source of the issue.

hopefully once the brakes are done it has no other issues hahah.

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[actungbaby]

Oh sounds like what us old fellows have to out up with oh cock.

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[stuartb]

I replaced all the spark plugs with new ones today and now it runs better than ever!

Didn't think sparks was the problem because they looked ok when I tested them. I guess they must've been weak?