Quote:

I don't think a simple valve adjustment caused the sudden noise.

1. Can you isolate where the noise is coming from? Top of engine on the left side or at the crankcase on the left where the starter gear train is situated?

2. If the noise is coming from the top end and there is no real miss you'll have to check the valve train. Maybe something broke like a banjo bolt or cam retainer that is rattling around inside. Maybe a valve shim was spit out of it's holder. I wouldn't drive until it is checked.

3. Does the bike still run smooth with no miss? If so, then it probably isn't a vacuum leak and you haven't dropped a valve.

4. If the bike runs rough/misses, then check everything mentioned. Vacuum caps on the carbs and AI system. Dropped a valve? Broken cam etc etc.

Look for the simple things first though.


After getting home and messing with it last night I'm fairly certain the noise is coming from the top, front, left cylinder. The bike runs smooth with no noticeable loss in performance.I got the bike when it is was shy of 15,000 miles and I'm up to nearly 38,000. I know that I definetly need to check/adjust the valves, as I have never done that so I will start there.

2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.