I've had the CBR 600 F4 just under a year. It ran great all summer and fall. It came time to store it so I topped off the fuel tank and added about a 1/4 can of Seafoam. I put a few more miles on it to make sure it got into the carbs and lines. I put it in my garage but left the battery. I charged it randomly throughout the winter. Just yesterday I needed to move it and we (my father-in-law and me) couldn't figure out a good way to trailer it. No good tie spots that would keep it from bouncing. I decided to ride it the 15 miles. Roads were good, I'd just bundle up as it was 30 degrees. As expected, I had to crank it quite a bit. Wore the battery down in fact. After sticking a jumper/charger on it, it fired up! Responded to throttle inputs just fine. Of course it was blowing white smoke. After wheeling it out into the driveway while I closed the garage door, it started to act like it was on three cylinders. I touched the throttle and it kills. From there I couldn't get it started again. I stuck the charger back on it. It cranks just fine. The battery is good just trying to top it off after all of the cranking. Acts like it wants to start with choke on. It sputters and just wont catch. Acts like no fuel. Tank is full and it will occasionally back fire while cranking, making me think it's getting fuel. Father-in-law thinks moisture just got into it and needs to be cranked through. Not sure about fuel pump but it was running fine when I put it away. Sorry first post is so long! Any ideas?

 

Maybe some crud in the carbs. Seafoam isn't really a fuel stabilizer.

 

Clogged jets? Sounds like what happened to me after I let it sit for a few months. Clean the carbs out really good.

Here's a good how to https://cbrforum.com/forum/how-mecha...r-carbs-40713/

If you don't plan on riding for a while and just want to move it you can probably just focus on the jet/bowl part and not the diaphragm, but when riding time comes do it all.

Also for winterizing next time turn the fuel valve off and run the bike until it dies from no fuel. Every time it dies I usually give it some throttle while restarting it until it just cranks. There's also screws on the carbs bowls that you can undo to drain the carbs. I just found turning the gas off and cranking it easier. Also add stable to the tank. Not sure, but I don't think seafoam does much for moisture.

 

Thanks, I'll most likely do that come this years winter! Any thoughts on Marvel's Mystery Oil? I haven't tried to start it since that cold day. My father-in-law figured that a plug just got wet. On a 50 degree day, I'll let it sit in the sun and then try it. I'm hoping it'll start right up! It's been cold up in Minnesota lately. Should be warmer than this!!

 

Update: I started the bike today, it was in the 50's! It started and ran on all 4 cylinders. I let it idle for a few minutes and same as last time, it started running on 3 again and idled down and killed. I'm guessing that plug got wet again. How long does it take to get the moisture out? How long should I let it sit before trying again? I really don't want to take the bike apart to get at plugs just because some waters in the fuel!

 

Throw some Stable in it. Or drain the fuel and put fresh in and run it. If it is water in the tank that'll solve it. If not, well at least you eliminated one possibility.

 

Go check your fuel filter and see if it is full. Let me know

 

I ended up turning it in to a local shop for an oil change and told them to do the plugs as well. I'm sure that new plugs will solve it. They'll test it to see if it was that or a stuck float allowing a cylinder to over load on gas. Thanks for all of the suggestions!