99 yamaha suv carb primer using stock air cleaner oil injection ports??

[WALBECOVE]

Any reason (safety or performance) not to use the oil injection ports on stock air cleaner to feed fuel to prime carbs? From the factory, oil lines (3) from oil pump connect to air cleaner ports that deliver/inject oil (from oil pump) into each of 3 carbs. After oil pump block-off; could the 3 oil lines be connected to a thumb primer pump that would inject priming fuel (instead of oil) into each of the 3 carbs - no need to mod carbs to accomodate primer fittings. Comments, suggestions, recommendations, cautions, etc.?

Also, what are the potential causes for next to impossible first starting the engine?