Since I bought my new FZ 1N in 2009 i'm in trouble with the first gear in cold and over 80 degrees warm conditions. By taking first gear you can hear and feel a terrible loud bang. If you have any solution for my problem please contact me as fast as possible! Thank you very much! R. Kraft

There could be many issues that make this noise.. but the temp range is an indicator.

There is an drive shaft in the center of the clutch.. at the outside end of this shaft there is a "core plug" or "clutch shaft plug" this plug ensures oil does not come out the end of the shaft and instead is directed to the clutch plates.

It is a small 1/2 button looking thing and it is not unusual to find it laying the bottom of the case or cover housing when one removes the cover. It just vibrates and wiggles it's way out over time. If this is the case.. remove the cover.. find the plug..use some locktite when reinstalling it.

The other causes are;
Worn chain.. they don't wear evenly and slack can be found in different places.
(Always replace all three; Chain, Rear and Front Sprocet as a set)
Dry or out of adjustment chain.. too much slack

Loose bent or worn shift fork
Broken Clutch Basket
Broken Clutch plate
Worn or bent shaft
Worn or broken sprocket
etc etc

I doubt your clutch cable free play could be so whacked out to cause that type of noise.. however..it would be a good idea to check just to eliminate it.


Regardless.. it's more than likely gonna have to be taken apart and inspected.

Best of luck!