Renthal Twinring wear?


47 replies to this topic
  • grayracer513

Posted September 07, 2011 - 09:09 AM

#41

Looking at post 7, the chain is not worn enough to create the wear shown in the picture. The spec for a new 520 chain measured between 11 rollers is 5.85", and he had 5.88", which is barely 0.5% longer than specification. Yamaha's wear tolerance is 2% (5.97"), and I use 1.5% (5.93") as my personal limit.

The wear shown is not so much "wear" as it is peened, as if the metal had been to soft and yielded under pressure. Frankly, that isn't excusable, given that even my OEM Sunstar sprockets did't do that.

Finding fault where it lies is not bashing.

  • Jeekinz

Posted September 07, 2011 - 10:10 AM

#42

my OEM Sunstar sprockets did't do that.


Neither do aluminum sprockets with good chains. That's why his chain wear is questionable regardless of the photos.

I even rode a $17 RMA sprocket with a slightly used chain and didn't have any wear like that.

  • grayracer513

Posted September 07, 2011 - 10:36 AM

#43

Neither do aluminum sprockets with good chains. That's why his chain wear is questionable regardless of the photos.

OEM Sunstar YZ sprockets are aluminum, heat treated, but not hardened. That was my point.

I know the OP well enough to trust that he can properly measure a chain, and I know enough to know that the wear in the photo is abnormal for a steel sprocket, and that a chain at 0.5% over length wasn't to blame.

  • geshields

Posted September 08, 2011 - 06:05 AM

#44

Renthal did send me a new replacement Twinring after some time. They never did say whether it was a defective sprocket or something else. I was happy with the customer service I received but I gave the replacement Twinring away.
I have no issues with the Ironman sprockets and I have 85 hrs on the one on my 2007 bike and 20 hrs on the one on my 2010 bike. They show almost no wear.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • mx369

Posted September 08, 2011 - 07:23 AM

#45

I use the twinring with the renthal gold chain for 3 years on 2 450s. Never had that kind of wear on either. But I NEVER mix used and new parts.

  • beezer

Posted September 08, 2011 - 01:54 PM

#46

I have twinrings on 3 of my bikes and haven't had any problems. 2 of the bikes have lots of time on them.

But the sprocket does look like the metal is soft.

Maybe they've improved them in the last few years.

  • grayracer513

Posted September 08, 2011 - 02:04 PM

#47

Maybe the one he had was a real live defect that bypassed the hardening stage...hmm?

  • PapaSneakyHoleshot

Posted September 09, 2011 - 04:25 PM

#48

Thanks for that post. I was going to buy one of these sprockets, not now!





Related Content

Forums
Photo

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies
Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.