1991 Suzuki DR 350 S oil flow diagram

Wet.

Semper Fi,
Z

oil blow-back can sometimes be caused by a blockage causing the oil not to flow properly or you have a bad oil pump.
check all hoses if it continues then take the cover off the oil tank , remove spark plug then hand crank the engine over and watch for oil flowing back to tank, if it doesn't you need to rebuild or replace oil pump

The oil has been worked too hard.
Replace oil immediately otherwise your engine will fail.
Also replace filter.
Use a quality oil and make sure you check it regularly.


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thanks

Your bike has motor oil stored in the frame instead of a " tank". there is a frame drain located at the lower portion of the front downtube of the frame and the engine. If you are changing the oil you should drain both the engine and the frame and then re-fill. since you bike has two pumps, one to feed the motor and one to push the oil back to the frame, you need to add some oil and then run the bike for 30 seconds or so. After you have run the bike for 30 seconds check the oil in the frame and add as needed.

thanks and I hope that this helps.
steve

HI, QUITE A SIMPLE JOB IN THIS ENGINE, LESS COMPLICATED THAN MODERN BIKES, IF YOU ARE IN ANY WAY CONFIDENT YOU CAN DO THIS THEN JUST MAKE SURE YOU PRE ALIGN ALL THE MARKINGS ON THE CRANKSHAFT, AND CAMSHAFT BEFORE DISASEMBLY, MAKE YOURSELF A DIAGRAME, TOP DEAD CENTRE, WITH CAM LOBES FACING DOWN, YOUL HAVE NO PROBLEMS, THE ONLY TIP I WOULD GIVE YOU IS CLEANLYNESS IS INPERATIVE, CLEAN THE MATING SURFACE OF THE ROCKER COVER AND CYLINDERHEAD, USE A GOOD SEALENT , IE HAELOMAR OR SIMILAR BUT DONT USE SILICONE AS THIS PUSHES OUT WHEN YOU TIGHTEN UP THE FIXING BOLTS, 6mmBOLTS 6-8ftlbs & 8mm bolts 12-16ftlbs (6mm bolts have a 10mm bolt head & 8mm bolts have a 12mm bolt head,

it is a switch that wont let you ride away with the side stand down. The bike will probably start in neutral, but when you put it in gear, or go to let out the clutch, the switch will turn off the engine, unless the stand it up pushing the switch closed

There should only be one main fuel line, from the tap to the carby, the rest are just overflow, and vent hose. If you have a vacume operated fuel tap, then it will be a smaller hose, from the tap, to a vacume pick up point somewhere, mabey on the inlet manifold.