Oil weeping from output drive shaft - 2006 Honda FMX 650

Question edited for clarity and typo 'weephile'.
Question moved from Misc to model category.

Screeching is dry metal on metal abrasion. Take it all apart and get some water pump grease on the shaft or replace it completely.

Seems to be a known issue

https://www.google.com/search?q=2002+Yamaha+YZF-R1%2C+coolant+leaking+from+weep+hole

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hi there sounds like you have a weeping seal that stops the oil going past the shaft these get hard a worn or cracked easy fix take off the gear change lever ,then the cover then you should be able to see the seal arond the shaft,then you should see the oil leaking get a bent screw driver or proper seal remover and remove then clean in the hole place seal loctite onto the outer surface of the seal then find the old seal if not too bent out of shape to use to knock the other seal in noting not to damage new seal,if leak persists then the shaft maybe worn which this will need replacing . hope this helps

Most Yamaha water pumps have a "weep hole" on the bottom of the water pump housiing.
Basically your water pump shaft has a coolant seal and an oil seal where it is driven...the weep hole drains away any leakage between the cooalnt and oil seals so cross contamination does not occur.
You probably should look at rebullding the pump. Don't try plugging off the weephole to stop the loss...it will contaminate the oil system.

If the oil plug bolt is leaking you need a new aluminum sealing washer. There are no oil weep holes in the front of the motor. Is it the weep hole under the water pump? You probably have a bad water pump seal or a bad oil seal on the water pump shaft. Buy a new water pump and the K&L water pump gasket kit. The K&L gasket kit comes with all the gaskets, seals, and washers necessary to do the water pump replacement for a fraction of the cost of the OEM Honda individual gaskets, seals, and washers.

The first thing to do is determine if the oil is motor oil or gear oil. If the oil is leaking from the final drive end( gear oil ) it will have to be removed and inspected for bearing wear and have the seal replaced. If the oil is leaking from the motor and then running down the swingarm, the final drive and swingarm will have to be removed to replace the output shaft seal.
Thanks and I hope that this helps.
Steve

There should be no oil leaking from water pump weep hole. There may be a bad seal behind the water pump on the small shaft that drives it or you may have bigger problems like one of the heads has a crack. You would more than likely have antifreeze in the crankcase if that were the case.

NOT THAT HARD IF YOU HAVE SLIDE HAMMER AND A 3 JAW ADAPTER.TO REMOVE REAR OUTPUT DRIVE SHAFT SEAL AND AND NEED A SEAL DRIVER TO DRIVE NEW SEAL IN THE TRANSFER CASE REAR.OUTPUT SHAFT HOUSING.

is this on the exhaust port or inlet port and which cylinder buddy

Sounds like an oil seal needs to be replaced and the other part is called a yoke.

on the right-hand side. Extracted the bung and found some grey fluid in the tube smelling like gear oil. Checked the LHS but nothing there. No indication of a leak anywhere and no drips. Had a look in Guzziology but couldn't find anything relevant. Any explanation?1.) Don't drop the oil level in the gearbox. It won't make a skerrick of difference to the weep and there is a risk that too little oil will damage bearings and pinnions. 2.) The most likely source of the oil is not the gearbox but the bevelbox. The crownwheel iof the box acts as a centrifugal pump picking up oil in the biox and throwing it around. Some of this oil ends up being flung at the pinion bearings and works it's way through and up the swingarm. This is especially true on models that have either had their suspension lowered or are thrashed regularly for long distances heavily laden. It can eventually work it's way past the splines at the back of the UJ where it meets the shaft and then pools in the UJ housing or is flung around in a spray as the UJ spins and whips it up! When this happens some of it may well be ejected up the stub axle with the result that it will appear at the bung. 3.) If it *is* the gearbox leaking it is most likely NOT to be the seal but the o-ring beneath the speedo drive support washer on the output shaft that is leaking. The gearbox ISN'T pressurised in any real way expansion of the contents is taken care of by venting expanded air via a breather on the back of the box. Any leakage past either the seal or the o-ring will generally be very minor unless something serious has happened like the cage of the output shaft bearing has collapsed and punched it's way past the seal. If you check the gearboxl regularly and it isn't loosing more than 30-40ml between changes it's nothing to worry about. Loss out of the output shaft seal or o-ring simply ensures that the seals on the caps of the UJ trunnions will remain moist and soft and help prevent the bearings inside the caps from drying out. If you're losing more than that, (And it will end up in the bevelbox eventually after working it's way past splines and bearings.) it will show up as the bevelbox being grossly over-full when you remove the level inspection plug from it and a blurt of oil will run out. The fact that you mention that it is a 'Grey' fluid makes me think that it is most likely to be oil from the bevelbox as this should have moly in it and this will present as a 'Grey' colour in the oil as it seeps out. Unless you are experiencing any other *worrisome* symptoms I'd simply seal up tghe bung with a dab of silicone or some such to prevent the weepage and check the gearox and bevelbox oil levels regularaly for a few weeks to make sure you aren't getting a gross re-distribution of oil from gearbox to bevelbox. If it all checks out OK? Stop worrying. ,,,