There's so much that could be going on...you came to the right place for advice, though.
Welcome to the forum!
Before believing a mechanic about an $8000 job on a $5000 replacement bike...(But you are in New Zealand and I've heard V-Rods go for huge money over there)...I'd be looking into a few things first. The cost of a used engine isn't that high, so why should you go the route of a repair job that costs $8000? Example eBay: a new engine can be had in the $2000 range. But you are in New Zealand...that shipping could get you.
First: Remove the oil filter and cut it open. Let us know what you find with pictures...that will tell us what you need to do next.
Remove the airbox lid, the filter element lid, and look at your throttle body. Sometimes the butterfly shafts can break.
That said...if you can remove the engine from your bike (not really that hard...takes less than a day), turn it upside down and remove the oil pan (This CAN be done without removing the engine but depending upon what you find you may have had to remove the engine anyways so now you are half way there). Look to see what if anything else you can find in the oil pan.
This could also be a failing clutch putting pieces in your oil.
This could be a broken gear putting pieces in your oil.
This could be a broken ring putting pieces in your oil.
Or a broken valve, or a detonated piston (but I doubt it).
Welcome to the forum!
Before believing a mechanic about an $8000 job on a $5000 replacement bike...(But you are in New Zealand and I've heard V-Rods go for huge money over there)...I'd be looking into a few things first. The cost of a used engine isn't that high, so why should you go the route of a repair job that costs $8000? Example eBay: a new engine can be had in the $2000 range. But you are in New Zealand...that shipping could get you.
First: Remove the oil filter and cut it open. Let us know what you find with pictures...that will tell us what you need to do next.
Remove the airbox lid, the filter element lid, and look at your throttle body. Sometimes the butterfly shafts can break.
That said...if you can remove the engine from your bike (not really that hard...takes less than a day), turn it upside down and remove the oil pan (This CAN be done without removing the engine but depending upon what you find you may have had to remove the engine anyways so now you are half way there). Look to see what if anything else you can find in the oil pan.
This could also be a failing clutch putting pieces in your oil.
This could be a broken gear putting pieces in your oil.
This could be a broken ring putting pieces in your oil.
Or a broken valve, or a detonated piston (but I doubt it).