So... the more i play with my 98 CBR the more questions I have...

I got my first bike, a 98 CBR F3 a few months ago. Red and black, looks OH SO SLICK. Bought it off a guy who couldn't stand a knocking sound. I brought a couple friends with me who ride, and they seemed to think it was fine. I learned about motorcycling and whatnot, went through the MSF course and got my license. Everything seemed to be fine.

ENTER: Three weeks ago. Long story short, bike fell over, I took it to the local Honda shop, got ripped off, bike came back with electrical issues and fuel leaking.

SO, I replaced the battery (which seems to have solved the electrical issue, and am now looking at the fuel leak. I went to go put the tank back on, when I noticed that the fuel drain tube had a lot of slack. I figured it was just coiled up "in there", and pulled on it a bit, so putting the fuel tank back on was easy.

I pulled on it, and it came out... So I'm wondering where does it attach to? Also, is the tank breather tube supposed to connect to the fuel pump at all?

 

It's a shame that you had that experience with the shop. It's sad that it happens all too often.

For the tank, there are 2 vent/drain hoses on it besides the fuel line. They just hang down and route near the bottom of the bike. One is a vent for the tank and the other is for spills near the filler. You can see the hole when you open the fuel cap. No hoses from the tank attach to the fuel pump other than the obvious one that fuel is passing though. There is a small hose attached to the black cap on the fuel pump just in case the fuel pump should have an internal leak. I haven't seen it happen or heard of anyone indicating they saw it, but anything is possible.

 

Thanks for all the help, Was able to find out where the fuel was coming from - it was a split mainline between the tank and the filter. One of my friends works at O'Reillys and she hooked me up with a new one.

SO... new problem...

I'm slowly learning how to fix things on my bike, I learned how to check the wiring, and replace the fuel line... Its great.

So I ride it to class for the first time in weeks, and after I get out, I notice that theres a few drops of oil on the ground where my bike is, it looks fresh. No worries, I go on with my day. I come back at night from studying and park it. I go to get on it the next day, and theres fresh oil on the pavement where I have it... I start to wonder... Yesterday, I park it in my garage, and its still leaking oil, so I take the plastics off, thinking maybe the oil nut is loose... and I see oil all over the chain, splatter on the bottom of my seat, on the left side of my rear tire, its dripping off my suspension arm... it looks like its coming from the (pardon my lack of technical vernacular) the start of the drive train? The main sprocket?

Its on campus a few miles from me for the moment, and I've got a new quart of oil and oil leak stopper... but I was wondering if theres anything else I can do...

Again, I had no problem with my oil before the local honda dealership got to it.

 

So... I've lost all of my oil, and I have no idea from where. I put another quart in alongside the oil leak sealant, and its still leaking oil like a stuck pig. Its all over the left side of my rear tire, and it looks like its coming out from the drive sprocket...

Any help is greatly, GREATLY appreciated.

 

I'd just start looking. I mean take off what you need to take off to figure out where it is coming from. You could put some uv dye (for oil) in with more oil and then use an inspection light w/ uv glasses to see exactly where it is coming from. I'd take my fairings/covers off, wipe it away and see where the leak was, to figure out what I need to do next. Keep us updated and good luck.

 

There is an oil seal behind the front sprocket. It's item #38 here. If that failed catastrophically, oil could just run right out.

Also, the Neutral switch is located right below that. If that fell out, it could leak out there as well.

 

I took it to another shop here in town, and aside from him telling me "if I were you, I'd part it out", told me the oil splatter pattern looked weird, because its also coming from in front of the oil pan. He told me to degrease it/clean it and see where its coming from.

I took off the sprocket cover, and the inside is covered with oil on the bottom, so I'm pretty sure I've got where my oil leak is.

So how would I go about taking off the sprocket to replace the seal? Which section of the factory manual do I look at? 7: Engine Installation?

You guys are life savers.

 

Here are some pictures of my issue.

 

well your probably going to have to start with removing the chain. im not sure how feasible that is without breaking the chain down. so your going to need a chain breaker/riveter..after you get the front sprocket nut loose, you can then break the chain down, and your sprocket will then be off..that should get you to your sprocket seal, but like dirt said, you may have to go deeper than that. ..

any of the external leaks you encounter are most likely going to always have something to do with failed o-rings, failed seals or failed gaskets. its just a matter of getting to them and replacing them. i would think if a leak doesn't fall into one of those categories, your probably dealing with some broken hard parts...(one of the cases). but doesnt seem the latter applies to you. I would get some purple power or brake clean and start knocking all of that sludge off so you can better inspect everything.

 

when you took it to the second shop, did they tell you why you should part it out? they inspected it, right? what did they see? i wouldn't advise anyone to "part it out" because of a seal or gasket that can be repaired. maybe they saw a crack in the engine case or something major due to the "falling over."