Main Motorcycle: BMW airheads
Join Date: Nov 2011
Location: North Carolina USA
Other Motorcycle: Norton Commando
1999 Speed Triple - knocking
I need some advice on a Speed Triple project bike, since I don't know them well. The PO had the sprag clutch problem and installed new rings around the same time he fixed it. Ever since, he was having trouble with the bike not starting when hot, and sold to me. I traced that to the CPS gap, he'd installed it with virtually no clearance. I set the gap to 1mm, refilled it with 3.5L of oil (Rotella T4 15W30, about 3/4 up the sight glass), and started it up for a test ride. It runs and seems to have decent power, but there's a knocking sound from the engine that gets worse at higher rpm. I don't know these bikes, but it doesn't sound good.
I pulled the valve cover to check that first. Left to right, on 1 the clearance is over .300mm. On 2, between .250-.279mm. On 3, .17mm on the left, .15 on the right. My Clymer manual says only one of those is in spec, so I will need to address that. I did hear some clatter from the left side, thinking maybe it was that loose #1 valve, but I've never had a loose valve cause knocking.
I found some stuff online saying low oil could cause noise, but I just filled it - unless I didn't add enough?
Other thoughts on what to check next? Let's assume the PO wasn't much of a wrench, because clearly he wasn't.