Stuck in Neutral wont go into gear – GV125 Carby
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Bike Model = : GV125
I recently bought a bike that the previous own had left standing for over a year, he had issues with it going into gear, stripped the clutch and left the whole thing open for another year until I bought it.
I want to stress this is my first bike, and I intentionally bought a small project bike so I can learn the mechanics of it as I want to learn how to fix issues as and when the arise and how best to do that than go in deep end on a project rather than encounter an issue on the road. As such I am still learning terminology and basically going somewhat blind into the endeavour so I may of missed something glaringly obvious to the more seasoned riders.
We’ve been trouble shooting this for about a week now, we discovered that the previous owner had removed the Detent plunger underneath the engine and installed it the wrong way, we’ve rectified this, and rebuilt the clutch as its was in pieces. but the bike still is stuck in neutral so while this was a problem that required sorted it looks like it wasn’t the only one.
VIDEO : https://www.flickr.com/photos/163418010@N04/shares/189sL6010u
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There is 2 plugs under the engine = One is for Oil Drain (It is surrounded by a triangle plate)
2nd plug is at a 45 degree angle so to speak , is it likely he removed that plug ? and bits fell out ?
There is a Bolt => Washer => Spring => a tip ==== These move along the gearbox cam shaft (It has a camshaft in the gearbox itself) or can we suspect he damaged one of the gearbox forks ?
How comfortable are you splitting down the entire engine and rebuilding back up after sorting out the crank/gearbox area ?
Your video suggest issue came from the “gearbox” stopper bolt being removed under the engine (mistaken for oil drain) thus bike is now in neutral , otherwise take it out , check what’s going on or god forbid the actual forks for the gear-select sprockets inside are damaged (bike lost gears) , but can’t be , because if its lost 1 gear, other gears should still click in to place as you spun the wheel and let in/out the clutch to engage.
I am hoping i made any sense so far?
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Update: we stripped the clutch back off and took apart the star gear we were actually able to manually rotate the drum and get it to go through all the gears, it extremely stiff hopefully from sitting dry for so long rather than bent forks.
Our plan at the moment is to soak the drum as best we can in oil, reassemble and fill up oil and run the bike (in neutral) to get the oil round all the internals and get some heat into it, hopefully that will ease the seize and rectify the issue.
Otherwise it’ll be a full strip down and see whats going on with the internal if we have no success in freeing the drum up for normal operation
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Looks like I’m going to have to split the case, drum will not rotate freely so most like something binding on it.
Before splitting the case up, spin the flywheel to see if the clutch drum rotates too ?
If you were spinning the wheel in neutral, the pistons would stay still meaning the crank doesn’t , but obviously if its in gear , it stops you rotating the wheel freely by hand
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