A bodybuilder yesterday admitted supplying the motor-cycle used in the murder of fireman Ralph Sprott.

However, Mr James Dunn, 33, denied that he was the hooded assassin who carried out the killing.

Instead, Mr Dunn, of Portsoy, Erskine, told the High Court in Glasgow he was given #200 for getting the bike with false plates.

He said he was at home with his son Kyle, five, when Mr Sprott, 34, was killed in Kilbowie Road, Clydebank, on May 8, at 7.45am.

He told the jury that two women who identified him in court as being the man who shot his victim in the back of the head were ''mistaken''.

Mr Dunn, a factory storeman, told his defence QC Donald Findlay that he was asked by a man, Mr Stephen McCall, to get him a bike.

The court heard earlier how Mr Brian McKendrick, 35, gave Mr Dunn a high-powered Honda 1000 with false registration plates to ''do a job''. Mr McKendrick claimed Mr Dunn said he would be able to repay him #2000 he owed after the ''job'' which would take only a few minutes.

After the murder police found the bike hidden in a lock-up with Mr Dunn's #350 crash helmet and his fingerprints. He had the key to the bike and the lock-up hidden down his socks and he had dumped his motorcycle jacket.

However, yesterday he told Mr Findlay he had given the bike to Mr McCall who threatened to harm his son if he went to the police. He agreed with Mr Findlay that he had been in Barlinnie Prison for five months since the murder and only mentioned Mr McCall two days ago.

It is alleged by the Crown that Mr Dunn was paid #10,000 by Mr John Ferrier, 36, for murdering Mr Sprott. He said he was the head bouncer working for Ferrier and Sprott before they split up, but only met the fireman twice.

Mr Ferrier, of Craigton Street, Clydebank, denies paying Mr Dunn to murder Mr Sprott and of previously trying to pay Mr William Hewitt, of Cardross Road, Dumbarton, #10,000 to murder him. The trial before Lord Kirkwood continues today.