So my bike had sat for a couple months after it had tipped and got a small crack in the left side crankcase cover which ended up leaking out oil..... I fixed the crack instead of replacing the cover and fixed the levers which had been slightly bent, but nothing major was damaged; the bike was tipped at a standstill. After I fixed the crack I put in new oil and checked everything and it seemed to be good. I had forgotten that there was old gas in there 92 octane that had sat for a few months without having stabilizer in it (stupid i know) and started the bike up and she ran just fine. I took her out for the day to test everything and it all seemed to be just fine, no bogging down accelerated just fine shifted tight everything rode just like it did before the wreck. I rode the bike all day so like 3-4 hours of riding time with no issues and not constant there were errands involved so stopping the bike and starting it up again without issue. The next morning I come out to start the bike up and it won't start it will just sit there and turn over without starting then ocassionally after trying to start it for awhile it will backfire really loud. I ran the battery out trying to start it and have jumped it and it still won't start here a week or so later. So, my question is what are the possibilites for why my bike won't start just sit there and turn over and over? Any help is appreciated....thanks

 

Sounds like you fouled out your plugs. Perhaps your starting method on that day. If your battery was a little weak, it may have fouled out the plugs as these bikes need a fresh battery and need to crank over fast. If they do not crank over fast enough, gas will be introduced into the cylinders, but the spark will not be consistant enough to fire the bike and the plugs will just foul out. Being that the battery was run down during the process, it made it even worse.

You could try to pull the plugs and dry them out, but having done this in the past, I would suggest just buying a new set of plugs. These plugs are usually junk after they foul and they wont perform correct again.

Also, if you left the petcock open, it may have flooded the bike from sitting. The gas can fill your floatbowls, then overflow into your cylinders. I would check your oil too, make sure there isnt a strong gas smell. Once you get it running, check the level and make sure the level didnt increase. If it did, it may have gas in it and will need to be changed again.

 

how much does a set of plugs usually run for the older bikes?? and also is this something that I can do relatively easily myself?? thanks for your help much appreciated...

 

Plugs will probably set you back about 12-15 bucks a piece. They are not cheap. Make sure you get a good set of NGK's. You dont want to run champions or some off brand plug here. these bikes need a good set of plugs to perform correctly.

On that model, Im not 100 percent sure. But you should be able to get to your plugs under your tank. Remove your gas tank, remove your airbox and you should be able to see the plugs. Some models require you remove the radiator and get at the plugs from the front of the bike, but I think yours in under the tank.

How easy it would be will depend on your knowledge and mechanical ability. If you have the proper tools, it should be a relativley easy job. But again, it may not be if you dont have the mechanical ability. If you feel you dont, have a friend lend a hand. Once you do it once, it will be a piece of cake the next time.

you can download a pdf file service manual, that should help you with the technical side of things. you can get one for free here:

http://hondatech.info/downloads/Moto/CBR/

 

You can get plugs for an F2 real cheap at Advanced Auto. They sell them for about $5 bucks a piece for the NGK's.

 

It isn't hard to get to them on the f2's, just take the tank off (remember that there are two lines that need reconnected when you put the tank back on) remove the spark plug wires (I would replace one spark plug at a time so you don't get everything mixed up and you can replace the wires back onto the new plug) use a 5/8 spark plug socket with a 6 inch extension, you might have to put the socket and extension in the hole first, then put the ratchet on after to get it to fit. Its an easy do it yourself project

 

when i take the tank off how exactly do i do that??? I have a service manuel so i know the pieces but it still has about 3/4 a tank of gas in it do i need to get the gas out first or can i remove the tank with the gas in it??

 

You should be able to turn your petcock to the off position. then remove your tank.

There are few things to watch out for since you have a lot of gas in there. One, it will be heavy. Be careful when lifting the tank. First, shut off the petcock, start your bike and let it run out of gas. this should suck all the gas from the gas lines before your remove them. You remove the upper bolts by the handlebars. remove the bolts by the seat. Tilt the gas tank from the front up, ( a friend holding the tank here helps), remove the fuel line from. ....caution here....Some petcocks form age do not completely shut the gas off. Be ready with some type of container that you can imediately put the fuel line into. A coffee can works out ok here. There may be some residual gas in the line, so your going to do this to make sure the gas stops. Once it stops, you can remove the tank and set it on a solid surface. If it doesnt stop, I would get a gas can and run the line into that and open up the petcock. You will have to drain most of the gas.

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Not all bikes are the same, so Im not sure if your bike has this, but you should have a small tab (mounting hole) in front of the seat where the rear of the tank mounts. On some bikes, you can remove the front and rear bolts of the tank, lift the tank, tilt it back and reinstall the bolt into the rear mount. This leaves the gas tank in an upright position. and it secures the tank so you can work on your engine without having to remove it. Some bikes allow the tank to be tilted without even removing the rear bolt. You just remove the front bolts, leave the rear one attached and the tank tilts up. You will need something to keep it propped up. If your bike has this feature, this would be the easiest way to go with a full tank of gas. It limits your room to work of things, but should be enough room to get to your plugs.

 

hey not sure about yours but i got a 91 and all i did is take off the lowers and with two three inch extensions and a universal along with a spark plug socket and ratchet of cores was albe to get all four out no prob without messing with the tank so try that first

 

Ok so i haven't changed the plugs yet but I was able to get it to sputter a little bit when i was jumping the battery but it wouldn't sit there and idle just die after i let off the gas and put the choke off still a plug problem?