A FORMER Finks bikie was beaten, burnt, stabbed and sexually assaulted in a Sydney hotel in an ordeal lasting 12 hours, NSW Police allege.

Four bikies were arrested during dawn raids in neighbouring suburbs on Tuesday more than four months after police were called to a mysteriously blood-splattered room at the Vineyard Hotel in the city’s northwest.

Cleaners called police on December 18 after making the grisly discovery and a subsequent investigation led detectives to arrest the men — aged 22, 24, 27 and 35 — who are now being questioned.

A 30-year-old woman, described by police as an associate of the gang, was also arrested.

Detective Superintendent Deb Wallace says the victim’s injuries included a loss of hearing in one ear from being repeatedly beaten at times with a “wooden instrument”.

He was allegedly stabbed in the knee and had boiling water poured over his upper body to remove his club tattoo.

“When you leave a club on bad standing, or in good standing, you must remove all identifiers that you have been a member of that outlaw motorcycle gang,” Det Supt Wallace told reporters.

“If you don’t remove it they will remove it by force.” Det Supt Wallace said the victim knew who he was going to meet that day a week out from Christmas.

“There could be a number of motives,” she said.

“We’ll be alleging that it’s a case that the victim was either planning to leave the outlaw motorcycle gang — or they didn’t want him in the gang.” Police believe he was with the alleged attackers for more than 12 hours. Det Supt Wallace said police had to work hard to gain the victim’s confidence so they could prosecute the “most serious offences”.

Venue CCTV from the previous night, released by NSW Police in April, showed a group of six men, some heavily tattooed, drinking in the pokies room of the Vineyard Hotel.

Another image shows four of the men and a woman leaving the venue later that evening.

Police are expecting to make further arrests.