Hey guys, first post. I recently picked up a 1990 CBR 600F in rough shape for like $400 and a case of beer. The bike runs up and down the street alright once you jump the solenoid, I'm getting around to changing all liquids out etc.. it's just my project/toy bike.

I noticed when I drained the oil there was a ton of gasoline in it, is this motor toast? Would that mean bad rings?

What are your suggestions?

Thanks in advance!

 

I'd probably put my money on stuck carb float causing the engine to flood. Gas is miscible in oil so it's not necessarily bad rings or anything serious with the engine itself. You can confirm flooding by pulling the sparkplugs. If they're gassy... well you probably get the idea

I'm also a huge sucker for the 'too cheap to refuse' project bike, so from my experience, if the bike runs when you bought it, it'll probably just need the basics, but worthwhile to put a bit of time into it to make sure it's not gonna catch fire or leave you stranded

You'll probably end up popping the carbs off for a cleaning, and to find out why she's flooding. If so, it's a good time to check the air filter, drain the old gas, replace any cracked fuel lines, and always put a fresh fuel filter on it. While the tank's off it's a good idea to check cables/controls, and give a quick visual for burned or cracked wires and other small action items

If you want to rule out a badly neglected block, I find a valve job is a good excuse to pop off the cover and get a look at the cam journals, sparkplugs, and timing chain. You won't need to remove the cams, just get a quick look at whichever journals are exposed when you do the valves. Follow with a compression test to rule out rings or burnt valves. If you do this while the carbs are off, you'll have more room to work, and if you need to get further into the engine, it's one less thing to detrim

Hope that helps. Also put up some pics - I want to see how far $400 and a case of beer goes these days

 

She looks pretty much complete. I'd say you did alright in the deal

 

I paid double that for a bike in much worse shape. I, however, suck at getting good deals. Well done.