I turned the bike on just now to go for a quick ride and when I started the bike there was a knock (not a normal rattle) coming from the left side of the engine and primary area. I turned the bike off and started it again and it is still doing it. I twist the throttle and the sound goes away for the most part but when I let off the noise comes back. Any ideas?

 

Mobil1 oil?

 

you don't say what yr, kind of bike etc..

possibly loose compensator bolt...

 

2006 Street Glide. Stock 88 EFI other than a stage 1 and a PC3. Less than 15000 miles and I use HD synthetic oil.

 

Have you checked the primary chain tension lately?

 

No I have not.

 

False alarm. My dumb *** had the kick stand resting against something that was rattling.

 

LOL! Well at least it was a cheap fix.

 

Look at the bright side you just learned the real difference between a knock and a rattle ........