If it ran for an hour with no problems then I wouldn't guess either the plugs or gas is bad. Smell the gas, does it smell bad? Gas smells very distinctive when it goes.

 

It does sound like fouled spark plugs from what I've been reading online I have had the same problem. It ran fine than it just wouldn't crank anymore no spark. I've put new spark plugs in mine but waiting on my new battery to get here to see if it's all fixed. My old spark plugs looked really nasty. Looked fouled for sure.

First thing i've ever done to a sports bike I only have worked on cars, Just take off the seat, Set back the gas tank, You don't have to completely remove the gas tank just unbolt it and pull it back and tie it to something to sit out the way, remove the upper air box, remove velocity stacks, remove filter, remove lower air box, Might have to remove side fairing but not sure on that, I ended up removing the side fairing to get to the lower air box easier. Took me about 2 hours to take it apart, 10 mins to swap the plugs (It's a tight fit), 1 hour to put it all back together. I followed this guide https://cbrforum.com/forum/how-mecha...emoval-106715/ Only a few things different like turning the fuel petcock off and stuff because we're fuel injected

 

Well I got it started,
It took alot of cranking at WOT but it finally caught and fired up.

Took it around the block a couple times and it turns off and on fine now.......

Either way I am still replacing the plugs when it goes in for the valve adjustment.

 

How many miles on current plugs? I notice a difference in the engine when mine approach 14,000 miles.
Its quite a bit easier and quicker to just unbolt the radiator and swing it out of the way [still connected to the hoses]. Takes me about 45min to an hour to do everything and have the bike ready to go again.

 

Got them done mid last year so I would guess about 15,000-20,000kms.

 

I'll have to look at doing that next time I have to change them. I was looking through my cbr book and it was saying drain all the fluids remove the radiator completely etc and I thought that was alot more work than the way through the gas tank

 

Yeah that would be a ton of work. My owners manual even tells me to unbolt and swing the rad away. I figured honda knew what it was talking about and tried it that way first. Worked quick so I've always stuck with it.