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General Category => General Discussion => Topic started by: gearman on November 08, 2016, 03:49:25 PM

Title: fuel tank rattle
Post by: gearman on November 08, 2016, 03:49:25 PM

I finally studied why my converts tanks all rattled.  The whole concept of holding 30 pounds of mass with a rubber bungee that stretches 2 inches with 23 pounds of force is a joke. The bottom of my tank has wear points on it from the bouncing. When it was full it bounced less, but still a horrible design. I made a real hold down that eliminates all bouncing. I can't believe I have fought this problem for 20 years on all my converts.
(http://thumb.ibb.co/kDRifa/IMG_0032.jpg) (http://ibb.co/kDRifa)

(http://thumb.ibb.co/ckwS6F/IMG_0031.jpg) (http://ibb.co/ckwS6F)

Title: Re: fuel tank rattle
Post by: yogidozer on November 09, 2016, 08:34:43 AM

I saw your previous post, and advised to remove the tank and look for rub/wear spots. Many manufactures use that bungee system. Even when held tight, I think a rubber/foam cushion is a good idea.

Title: Re: fuel tank rattle
Post by: gearman on November 09, 2016, 08:56:53 AM

I still have the rubber cushions, but don't use the bungee to hold the tank tight against. I did the math and the bungee on the guzzis are not reliable.

Title: Re: fuel tank rattle
Post by: thomas on November 09, 2016, 11:28:52 AM

Good design!
Funnily enough I've never had that problem on my two SP1000's (same frame & tank) or on my two 850 LeManses (same frame, different tank).