strange noise

[slickrick2085]

I have a 07 sportster 1200, when I shift into fourth gear and twist the throttle I hear a rattling noise but I cant tell where its coming from, it sounds like a chain rattle but the primary is tight, does anyone have any ideas what it could be, its driving me nuts.

 

[glider]

It sounds as if you are describing pinging from too much load in to high gears. Try downshifting a gear and see if it still does it. Also use a higher grade of gas to see if it eliminates it if you are using a lower grade.

 

[slickrick2085]

thanks I've been running high octane gas, think I'll try an octane booster and getting my rpm's higher before I shift as it only seems to do it when me and my girl are both on it

 

[glider]

Octane booster is overkill on a stock/nearly stock engine. Try running up the revs before shifting a bit more, that should do it.

 

[likker]

Hey I have similiar issue (s) I have a 07 sporty 1200 with 3600 miles and an EFI race tuner kit in it. I was riding with friend who heard what sounds like marbles rattling around when I gun it in higher gears and let off it makes a rattling noise. I noticed it when i was going to slow for a gear but Im not sure if its related. I also read about the first gear clunk but mines clunks in all 5 gears. I adjusted clutch per all the instructions Ive read hear but still a clunk and rattle. Any suggestions? By the way I have no idea how the EFI kit is programmed