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Thanks for clarifying. Yeah, I can explain the rubber hose. Before looking at any drawings when I had the carb apart, I thought: "Hey, a gash in the tube, no wonder it leaks!" Long story short, I now have a slit in the tube. I still think I should get some kind of filter element at the end of the "sub-air cleaner tube". Any suggestions?

Gotcha! You can kinda see the marks from the seepage. Looks like it could be coming from the main adjusting screw?

There's a serial number tag in front of the frame where the fork mounts. Worth a shot?

I grabbed a pic of the carb:

Yeah, I'll do another oil change fairly soon. I'll buy a factory spec plug and see what difference that makes. Will run a less oil rich mix in the future for sure. This is an "environmental friendly" premix purchased in 20L drums. From now on I think I'm gonna buy Shell's 99-octane V-Power and mix in the synthetic 2-stroke oil myself. Any word in that extra "hole" in the carb? The drawings I have both show two adjustment screws. Let me know for sure!

Gear oil: OMG, I was shocked to see the what looked and felt like black water pour out of my tranny! I flushed it out with some gasoline, and gave it a fresh load of Dexron III ATF (mineral oil). What a difference that made! Stuttering: After being able to ride a little around, the motor has developed a stuttering kind of behavior. All of a sudden it lacks power and "puffs" more than usual. And equally abruptly it disappears and function normal. I swapped the tank for a different one, could there be remnants clogging the filter? Time for a new spark plug? Oil leak: I was trying to trace down an oil leak I believed to be gear oil. It obviously is not. The oil is dripping from the carb onto the gearbox housing. I believe this is due to the superfluous oil/fuel mixture. But still, why is the oil getting out? I have the Dellorto PHBH26BC with one adjustment screw. There's a hole to the left of this screw, could it be coming out of that? I have always been running 2% (50:1), because I was told this was within spec. No wonder oil is always dripping out of my silencer, huh?

How about trying to burn it out? Either in a hot oven or with a live flame (ie. oxy acetylene, etc?), you'd think the carbon and oil buildup would burn off before the aluminum starts to melt?

Will do. What color is the Elf stuff?

Mucho gracias for the replies! It now runs and have a working clutch! Still got that leak though, it's hard to localize, but I'm thinking it could be the output axle seal (where the chain sprocket is)? The color kinda has a motor oil color to it..? So, I think I'm gonna try some Dexron III ATF for the gearbox. Is it a no-no to just top off the oil level without knowing what kind of oil that is in there, or should I do a complete drain and fill? How can I when it's full? Oh, and Mr. Fastducs, it's a PHBH26BC.

I'll check the spark before I dissasemble the carb. Anyone have a clue about the sub-air cleaner and vent loop line?

Hm, that's awkward. The carb has been super reliable before, and I didn't take it apart at all...

Okay, so I just stuck an extended rubber hose to the hose barb so it won't leak. Upon attempting to start it, I didn't even get a slight inkling of combustion. This thing has ALWAYS been a second-kick-start bike, but then again I've never had it apart like this. Could the fact that I patched together (ie. sealed) the proclaimed "air vent tube" have something to do with it? My Jeep is wrecked, my license is suspended, my finals are coming up... and I wanna ride so bad now!

Assembled the bike, and upon installing the feed line and opening the petcock - I had fuel pouring out the back of the carb. So there's this 4th outlet, that I thought was for overflow purposes, or something? But after looking at the drawings, I am at a loss. Is my '99 w/ Dellorto supposed to have the "sub-air cleaner" unit? What does it do? And also, what does the 'air vent tube' that loops around the carb do? I reckon it's supposed to have the gash in it?

WTF? What happened to the replies that were here yesterday? I disassembled the bike yesterday and cleaned some stuff up. The oil residue almost looks like normal motor oil (translucent amber). I found the tube that goes around the carb (from each side) was torn. Could this be the culprit? Also, are there two vent lines from the crankcase and gearbox? Is one supposed to go into the frame? Where's the drain plug for the gearbox? Are there some way of calculating the amount already in there, or do I have to do a complete drain and fill-up? What color is the ELF stuff that's supposed to be in there? I have some Dexron III ATF, is that a go or a no-go?

Hi good people! I've had my bike for a while, but now it has been sitting for over a year (school abroad). It's a '99 Cota 315R with a lot of 2004 (or so) upgrades. When I parked it, it had some minor issues with the clutch, but now it's straight useless. It doesn't disconnect at all, when you put it in 1st with the clutch engaged it literally takes off. I tried bleeding with no luck. Secondly, there seem to be a fair amount of oil seeping from the underside of my engine. How should I go about to take care of this, do I have to split the whole engine and change the gasket? At the risk of sounding like a complete n00b, would this be motor or gear oil? Or do they share oil? Is that the plastic fill plug on the right side? Lastly, my bike is probably in due time for a little tune up. What kind of spark plug, oil(s), coolant, air cleaner, brake pads, etc. are recommended? Thanks a bunch!