511 pulley worn in 5 runs

[fastinfastout]

I built the car as per manual, had about 5 runs with a 5.5 turn, and noticed the belt started skipping/slipping. The rear pulley has been worn down. The belt was not overly tight or loose, the belt is in very good condition. Seems unusual to get the pulley worn down so quickly. Slipper was not overly tight, just as per normal how I usually have my other cars. Is this the norm? The front looks new!

[KyleHirano]

Diff pulleys have been a weekness, on some vehicles, mainly 501, 511, and db01r. You have to setup the slipper clutch almost perfect as well as the diff, especially if your going to use a 5.5 motor. When the diff pulley gets hot, it's just a matter of time before it fails. Jumping a buggy and immediately punching the throttle with that hot motor, will cause damage every time, if your clutch is not setup properly.

I've gone through two rear diff pulleys on my db01r and I finally loosened my slipper clutch, and now things are good.

[muratti]

I have never had this problem, neither on the DB01R nor the 511. Seems indeed your slipper is too tight and maybe the belt a bit too loose. I alyways check the slipper when hearing the diff slipping i set the diff tighter or the slipper looser, both prevent stripping or overwearing the pulleys.

[fastinfastout]

yeah thanks guys, I might need to set the slipper a little looser as I never had this problem on my db01r and 501x, however back then I ran 8.5's

[Fredrik Emilsson]

Also think slipper is to tight and/or belt too loose.

With old belts (501X) it was important to adjust belt tension after ~8 runs. Once it started to slip, the pulleys would wear out pretty fast.

On 511 I´ve never had that problem. I tighten belts as per manual. The reinforced belts don´t stretch out like the "old" 501 belts did.

So recheck belt tension. Notice that rear diff pulley/belt should be tightened 2 notches. 501X with 369 mm belt was only tightened 1 notch.

[fastinfastout]

yep I have the rear belt as per manual, 2 notches forward. I will put a new pulley on, on the spur if its worn too, and back off the slipper more.