Re: 98 Honda Magna vf750c. Do the engine and the transmission have a common sump, i.e. or separate oil?

SOURCE: 1997 Honda vf750c turning over but not starting

In order for it to start, you need to find out if it got spark and fuel. If you thinks it fuel, you could try a small shot of starting fuild into the air filter box. If it fires and then dies out it definitly lacking fuel. If it does fire up with starting fluid, you need to check spark. Remove one of the plug wires and install a spark plug on it. Gorund the plug to engine by resting it on a metal part. Locate the plug as to be able to see the gap on the plug. Crank engine over and check for spark at the gap. If no spark check kill switch. Ed

SOURCE: Carb removal from 1994 VF750C Honda Magna

You should probably get a service manual.
As I recall: Remove seat, gas tank, side covers and brackets, and plastic things in front corners of frame. Take off rubber intake thingy and slide out air filter cover toward the left side (it's a ***** because of the flap in front). Loosen metal intake housing plate, rotate and remove intake horns being careful not to bend the horns or drop screws down carb throats. Slide plate out.
All four carbs come off as one assembly. There are four rubber tubes connecting it to the engine. Loosen the hose clamps on the tubes and gently pry the carb assembly up. Find safe points on the carbs to pry where you won't break anything, and be gentle. If it hasn't come off before it will take some going from corner to corner till it comes out of the rubber tubes.
You can clean the jets without disassembling the "quad pack".
I put a little oil on the tubes to reassemble. Getting the horns back in is a bit tricky. The plate goes on loose, then they slide into the carbs and rotate as I recall. Good luck

SOURCE: where is the drain and filler plug on a 1984 honda125mthreewheel

Transmission and engine oil the same (... share a common sump ...)

Fill through the same place you put the engine oil in (also, check it)

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SOURCE: '96 Honda VF750c Magna rear brake shoe change?

Check the generic procedure outlined in the generic service manual at this site: http://hrca.honda.com/

SOURCE: 1996 Honda VF750C fork oil level

It should be able to hold between 200 - 240 cc in each fork stacchion and no more as your fork will becomes very stiff and no bump absorption will happens.
Good enough?