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Post Info TOPIC: using gearbox oil


DTR Member

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using gearbox oil
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i keep topping up my gearbox oil and the next day its back at the bottom of the sight glass no visible oil leaks,engines only done 4,000 miles any ideas anyone.



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Guru

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hi, i just ignore the glass window, and measure the amount that is needed

somthing like 850cc it says on the engine case



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DTR Senior Member

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Think its only 750ml of oil you'll need, can't remember exactly. If the bike is chuffing out mountains of smoke then you've got a problem, but you'd know about losing that much oil that fast, it doesn't just disappear! When you look at the sight glass from the other side, when you have the casing off, you can see its not the most fantastic system, as there is a metal plate behind it, I think its there to stop the level fluctuating too much (visually anyway) when you tip the bike from side to side


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DTR Senior Member

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hello got a problem with my bike....similar to this i think...basically i noticed a lot of white smoke and milkyish gearbox oil so i replaced the head gasket and changed the oil but the oil has gone back to milkyish again...also a lot of white smoke....trying to get bike ready for mot....any ideas?


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DTR Trusted Engine Builder

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if the oild milky then its deffo water getting in, but if its burning smoke it will be the right hand crank seal letting tranny oil in the crank cases

if the gaskets re used on the clutch case it can oftern leak water on the front section where the water goes thru, i always put a smear of instant gasket on that bid, for extra sealing

the water pump seal and shaft can wear out also causing water to get in

check all the above, make sure all surfaces are clean b4 fitting gaskets 

check for head/cylinder warpage on a piece of glass

not much else where water can get in mate



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DTR Senior Member

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its recently had
new water pump seal
crank case gasket ( side with kick start on )
new head gasket

could it need flushing through a bit more?

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DTR Trusted Engine Builder

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yeah could do matebuy some wynns engine flush, get the engine hot and then tip it in and run it for a couple of mins, no riding tho, drain and flush and repeat again iff needed

could also be the waterpump shaft if thats worn as it wears a groove in it off the seal over time, best replaced 2gether really if there bad



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DTR Senior Member

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yeah i will try that mate thanks just trying to get it m.o.t ready,,,got a problem with kick start if you want to take a look...i will put a thread on now
thanks again

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DTR Trusted Engine Builder

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where i take my bikes for mot hes never started one of them so never bothered me what thev run like

yeah i ava look



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DTR Trusted Engine Builder

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i always use ATF fluid in my gearboxes, its good a dertegent as well keeps things nice and clean inside lol

dont last aslong as normal but its free to me so thats what i use

alot of the top mxers use it in the states



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