Oil Leaks old triumph motors used to leak out the crankcase breathers when the return on the bottom of the piston oil pump would get clogged by particles of break in metal on new engines, and had to be removed and cleaned of all particles and replaced back on the machine. My question is what kind of oil pump do the new triumphs use in their engines. would love to see a picture or photo of the entire new engines make up! like the old triumph used push rods to the rocker arms. now they must have a timming chain? would love to see what exactly the inside make up of the new triumph engines look like! thanks BrotherShawn. at [email protected]

Question edited for clarity.
Question moved to Buell Blast.

On a bike with no service history it would be standard practice to change oil and filter.

It seems to be a known issue.

https://www.google.com/search?q=2002+buell+blast+spitting+oil+from+the+crank+case+breather

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You might have a stuck piston ring allowing compression to leak inside the oil sump

It could be worn rings ( especially if it is an older t120 60's-70's ) that is allowing compression into the crankcase and blowing the oil out the breather.

The saw you have must have a combined crankcase/oil tank, they will be seperated via a gasket, if this gasket is leaking then oil from the oil tank can and will enter the bottom of the crankcase.

could be the crankcase breather or check the pcv valve

You need to service the crankcase breather system. Basically, this means taking apart and cleaning all the goo out of the area where the crankcase breather tube goes into the air box. Also check the air filter for oil saturation and replace if needed - and clean any accumulated oil from the inside of the air filter box.

a small amount of oil from the crankcase vent hose under hard acceleration is most likely normal.American bikes don't leak oil,they mark their spot!

Bad valve seals
Worn valve guides
Pressurized crankcase (oil pan) due to a clogged PCV valve or breather system
Blow-by from worn piston rings

Bad valve seals: The valves are located in thecylinder head above the combustion chamber. Oil is pumped at 50 to 80 psi of pressure into the top of the head, lubricating the valve-train; the valveshave seals on them to stop the flow of oil down into the engine when the valve is open. If the seals fail, oil is allowed to flow down into the combustion chamber and is burned.
Worn valve guides: The valves are guided by a small cylindrical chamber called a valve guide. These guides wear over time causing eccentricity (or slop); the excess gap allows the flow of oil down the valve stem into the combustion chamber to be burned. What about the valve seal you say? Well, the gap is too great for the seal to stop the oil flow, so down it goes to be burned.
Pressurized crankcase due to clogged PCV or breather system:The car's engine is a giant pump, consequently it must breathe. The PCV (Positive Crankcase Ventilation) system does just this, allows the engine to exhaust the excess pressure build-up (which is a natural phenomenon of the internal combustion engine). Carbon build-up is a by-product of an engine and can build up in the PCV system, clogging the breathing passages. This in turn pressurizes the oil pan and pushes oil up into the fuel delivery system, where it is fed into the engine and burned.
Blow-by from worn piston rings: The pistons in your car's engine have seals around them in the form of rings. These rings do two things:

1. Seal the combustion chamber so the precious power developed from the firing of the cylinder is not lost.
   
2. Provide vital lubrication to the cylinder walls.
   

When the rings wear out, the pressure from combustion reverses down into the oil pan, pressurizing it and forcing oil into the valve covers, through the breather system, back into the fuel delivery system, and into the engine to be burned.
You may ask yourself, "What can I do to stop this from happening?" Keep your oil and filter changed every 3,000 miles and keep the air filters changed every 12,000 miles!! This will keep sludge and carbon buildup down to a minimum. Understand that you can't stop mechanical wear, but you can slow it down!