Need Advice on a Problem

I have an old Honda SL175. I've only had it a few months, so I still don't know much about it. It ran great when I bought it, and has gotten a lot of use by my boys and me. A couple weeks ago my boys went off to college and it sat until yesterday. I needed to use it go back to my barn, but after warming it up I noticed that at full throttle it would bog/break up/miss. If I backed off to about 90% full throttle it would run fine. I didn't have any time to try to troubleshoot it, so I thought I'd ask here in case anyone has any ideas that might point me in the right direction.
I know all the typical things to check, but I 'm just a little hung up on the fact that about two weeks ago when i put it away it was running fine and now suddenly isn't. Any ideas?

Carb issues most likely.....the Suzuki 185 quad thats on the farm has been doing the same thing for years(it sits alot too)

I'm thinking water in the carb or a sticking float.

Crap built up in the carb from sitting. Pull the rubber air intake boot off,rev it until the valves float, and then block off the intake until it almost stalls. Repeat a bunch of times.

Carb cleaner works too but that costs money!

Being a farm, you could also have a mouse nest in the airbox.....

In reply to bearmtnmartin:

Thanks for the suggestions guys.
BTW, It's not a farm. its stored in my rodent-free shop. I just have a barn in the back.
Here's my question - How does the carb get crap built up in it after sitting with good gas for 2 weeks?

Check the petcock for schmegma.

Clean the fuel filter, try some sea foam.

914Driver wrote: Check the petcock for schmegma.

That's a good suggestion. The one thing I did in that two weeks is fill the gas tank just before riding it yesterday, and that's when the problem arose. I'll check the fuel filter also.

bravenrace wrote:

914Driver wrote: Check the petcock for schmegma.

That's a good suggestion. The one thing I did in that two weeks is fill the gas tank just before riding it yesterday, and that's when the problem arose. I'll check the fuel filter also.

With gas, right?

In reply to 914Driver:

Uh, yeah, gas. Ummm, well, err.., it was in a gas can. Is that close enough?

If you've got kids .....

Bravenrace, if your using 10%ethanol, fill a jar about half way with "good" gas...cover the top with a rag and place it on a shelf for two weeks. Then you'll be able to see where all that gunk comes from.