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Once agian...O Ring chain on 85 cc

Discussion in 'Pit Bikes & Mini's' started by RanMan, Apr 21, 2003.

  1. RanMan

    RanMan Rookie DRN Member

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    Has anyone actually tried a 428 O Ring chain on an 85 cc bike?
    My son's YZ is eating up chain s like crazy. The muddy conditions are rough on these things, I know, but he only got about 4 rides
    on the last RK chain I put on. I just ordered an O Ring for it
    and gonna try it. At the rate of wear on standard, I'm not sure he will be able to finish a H/S this coming weekend.


  2. viking20

    viking20 Sponsoring Member

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    Sorry,never tried using o-ring chains on the yz 80/85´s we had.I always had the impression that the RK chain was generally a good product,but then my son broke 2 chains that were fairly new,the plates broke,-not the split link!
    Tried one more from the same dealer,one moto and it was completely stiff...
    Maybe I was just unlucky,but I havent used RK chains since then...
  3. MikeS

    MikeS Lifetime Sponsor

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    Yes we have and they are OK. We use the DID ERT series gold. They are alot heavier about 30% thicker. These are mid way in price from basic RK/EK to O ring. We have 15 hours of Harescrambles amd GNCC racing and we will probably get 2-6 more hours out of it. We have gone through 4 rear tires in comparison....

    good luck
  4. LocoCD

    LocoCD Lifetime Sponsor

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    Put it on and took it off. Way too much drag for the engine.
  5. karterron

    karterron Subscriber

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    Where are you finding 428 O ring and ERT chains?  I was going to switch my sons YZ85 over to a 520 so that I could get the ERT chain.  Is that possible?  If so, what sprockets do you buy to fit.  I have not seen a 428 ERT chain for sale.
  6. MikeS

    MikeS Lifetime Sponsor

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    I apologize for the description....DID 428 NZ they used to be ER series but they changed the 420-428 to NZ last year.

    Dennis Kirk, Competiton Direct, Parts Unlimited .
  7. whyzee

    whyzee Never enough time !

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    I can't find one either. I got the RK GB428MXZ as a replacement to the stock, has anyone had experience with? It is a heavier duty chain than the standard RK 428SO chains.
  8. MikeS

    MikeS Lifetime Sponsor

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    Actually the RK ones I tried are not good. Lasted for 3-6 hours and stretched like a stocker. Sorry.

    Maybe I got a bad one. I have used RK520XSO and wow great chain.
  9. 94ruck

    94ruck Rookie DRN Member

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    My son has been using an RK 420 o ring for 1 year on his 80cc hare scramble KX. It may be noticeable drag but he holeshots or runs in the top compared to 85cc and 100cc bikes with some fast kids on them. We also have a steel rear sprocket. This bike is not set up for MX and by the time an hour race is over, there is way more mud than to worry about a little drag or excess weight. This bike has been ridden harshly ALOT. Of course my son is small but he is 13 and a decent rider. We would go to lighter stuff if we rode MX soley but right now durability is worth a couple of LBS and HP.
  10. RanMan

    RanMan Rookie DRN Member

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    I got his 428 O Ring at "Chapparral Motorsports". I paid $66 total including
    $17 for 3 dat shipping. Had to have it by the weekend. I put it on yesterday and it does have a little more drag, but maybe the pro's will outweigh the con's. He only rides HS and trails with the occasional MX just for fun, but does not compete MX. In the conditions we ride in, the standard chains was only lasting 3 to 4 rides and they were toasted and that's even after cheating and removing a link just to get by for the day. I also run steel sprockets on it.
    He can take that little 85 anywhere I can take my 200 and sometimes better than I can. If it last any longer at all, it will be worth the money.

    Oh yea, I forgot to mention that it's a DID 428v chain.

    Found out yesterday when checking spokes, I've gotta replace his front rim.
    He dented it in some rocks this past weekend. Must have been one of those times he run off and left me behind..........
  11. MikeS

    MikeS Lifetime Sponsor

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    I hate when that happens :p

    Glad you got the chain let us know how it work out.
  12. RanMan

    RanMan Rookie DRN Member

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    The most embarrassing part is there were 4 older guys sitting at the top of this one nasty, rocky, long, narly hill watching. First here comes my son with me tagging along behind. He zooms through this mess only for me to get myself in a spot to where I had to get off and walk my bike through. Get to the top and these guys asked me "How old is your son"? "Just turned 13", I replied. I still haven't figured out if they were laughing at me or with me.

    I was more proud than embarrassed though...........
  13. RanMan

    RanMan Rookie DRN Member

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    I just took the little 85 for a test run after putting on chain. Gotta tell ya, I couldn't tell a difference in the O Ring and standard. Had it's usual bottom (which never was alot on the YZ). I was expecting a big disappointment, but was pleasantly suprised. Now, if the stretch rate is as good as my 520 chain, we'll be in business. I will give further update after this weekend.
  14. Y2Z

    Y2Z Subscriber

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    wow ive ridden some real tought terrain and have never broken a chain on any of my bikes, i recentrly bought an 0-ring for my KDX works great, havent tried it on an 80 yet tho
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