Results 1 to 11 of 11

Thread: Added 415 U-Ring Chain and Sprockets

  1. #1
    apriliaforum prov-nov jpk's Avatar
    Join Date
    Apr 2008
    Location
    White Lake, MI
    Posts
    85

    Added 415 U-Ring Chain and Sprockets

    Swapped out the stock HEAVY chain and sprockets for a RK gold U-Ring chain, PBR front sprocket, Sprocket Specialist Rear. It was a pain to find a U-Ring “sealed type” chain. I ended up ordering the chain from Japan, front sprockets from Italy and rears from Utah, USA.

    Weight savings is 3.75lbs in reciprocating mass.

    Weather is not cooperating for a test ride.

    Stock 520 set is 17/40
    For the 415 set up went with 18/19/20 and 47/48 (20/48) on the bike now. Sprockets close to the same size as stock and ratio is similar. Click image for larger version. 

Name:	0AC8D84F-C4C0-491C-834E-7471482CBD93.jpg 
Views:	14 
Size:	100.5 KB 
ID:	386960Click image for larger version. 

Name:	FFB982C0-9E39-4938-9972-F9E7AD616698.jpg 
Views:	11 
Size:	95.1 KB 
ID:	386962Click image for larger version. 

Name:	4C8D04CB-A59B-4D68-9E74-51C564100A63.jpg 
Views:	10 
Size:	98.5 KB 
ID:	386964Click image for larger version. 

Name:	A9B7AEB4-F7F5-468A-A3A0-E2593C3EC06B.jpg 
Views:	11 
Size:	98.2 KB 
ID:	386966

  2. #2
    apriliaforum Junkie freedomgli's Avatar
    Join Date
    Sep 2009
    Posts
    487
    Nice. Every bit of weight savings helps. For a bike that is stored indoors and never ridden in rain and meticulously maintained I don’t mind the reduced safety margins of undersized drive chains. I’m just paranoid about a broken chain leaving me stranded or worse damaging the engine cases or causing injury. And I say this as someone who did a 520 conversion (from std. 530) on my CB350 race bike. This causes me to clean and lube my chain religiously and replace it ahead of schedule.

  3. #3
    apriliaforum prov-nov jpk's Avatar
    Join Date
    Apr 2008
    Location
    White Lake, MI
    Posts
    85
    I agree about the weight savings.

  4. #4
    apriliaforum Junkie freedomgli's Avatar
    Join Date
    Sep 2009
    Posts
    487

    Added 415 U-Ring Chain and Sprockets

    Yeah I think most motorcycle manufacturers have to build in safety margin with the expectation that these bikes will be parked outdoors year round and ridden by 16 year old learners who are still figuring out the finer points of motorcycle maintenance. You should be fine. Just take good care of your chain and it should take good care of you.

    I had never heard of a U-ring chain before. That prompted me to look at the RK site where I see they have non-sealed, U, O, RX, UW and XW ring sealed chains. I had assumed that non-sealed would be the best for minimizing parasitic drivetrain losses (combination of weight, friction and strength) but that might depend on the specific use case as the U-ring sealed chain likely has the low-friction advantage without a big weight penalty typically associated with sealed chains. Looks like the 415HRU you chose is their recommended racing chain for a 125cc bike but they do caution against using it on the street.

  5. #5
    apriliaforum expert maddad's Avatar
    Join Date
    Jul 2009
    Location
    AUS
    Posts
    7,478
    I had a good run with a DID 415 on the track stretch would be my only concern RK make some pretty good gear ,used their sprockets also on the TZ for racing went well .So I guess if your not giving it too much grief should be OK.

  6. #6
    apriliaforum expert twinturba's Avatar
    Join Date
    Apr 2004
    Location
    S.F
    Posts
    553
    This is a great upgrade and I'm surprised more enthusiasts don't make the swap. The last Cagiva Mito 125 I bought came with a factory race kit (SP) which included the 415 chain and assorted sprockets. This led me to do the same upgrade on my RS50 TT
    Jenius Biker Blog

    Current: RS250³,Newd, TT, Max, Nastro, Bangkok, 85 ADV

    Past:Versys, Typhoon, NCXD, RC390², Madass, PW50, KTM BR 65, Aprilia BR50, Aprilia RS125², DRD, WR250X, Derbi SM⁷, Aprilia RS50¹⁰, Derbi GPR³, Aprilia RS250², Mito², NSR50², NS50, HRC RS125, HRC RS80, YSR63 (1st 2stroke!), FZ600, KLR250(1st Bike!)

    I Need Parts!

  7. #7
    apriliaforum prov-nov jpk's Avatar
    Join Date
    Apr 2008
    Location
    White Lake, MI
    Posts
    85
    Added a new exhaust, had it Jet Hot coated to protect it.
    Really happy with the looks and additional RPMs gained.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	81F5382E-4502-4F35-8EC8-06F49DD21BA6.jpg 
Views:	4 
Size:	95.7 KB 
ID:	388851  


  8. #8
    apriliaforum Junkie freedomgli's Avatar
    Join Date
    Sep 2009
    Posts
    487
    That looks great! I’ve thought about doing this to both my Arrow pipe on my RS50 and my stainless steel Tyga on my RS125. Both are tarnished looking but structurally sound.

    Is that the Classic Polish 1300F coating?

  9. #9
    apriliaforum prov-nov jpk's Avatar
    Join Date
    Apr 2008
    Location
    White Lake, MI
    Posts
    85
    Yes it’s the classic polish. Also considered the titanium color but went with classic.

  10. #10
    apriliaforum Junkie freedomgli's Avatar
    Join Date
    Sep 2009
    Posts
    487
    Was your pipe used or brand new when you sent it to them? I assume they degrease/ prep any exhaust before they coat it.

  11. #11
    apriliaforum prov-nov jpk's Avatar
    Join Date
    Apr 2008
    Location
    White Lake, MI
    Posts
    85
    It was brand new. They blast it, I think bead blasting but they do used exhaust too.

Similar Threads

  1. Chain and Sprocket Set
    By corney in forum RS50 Technical
    Replies: 16
    Last Post: 04-09-2004, 05:07 AM
  2. chain and sprockets
    By speedy2003 in forum RSV Tuono, Tuono R, Tuono Racing, and Tuono Factory (2002-2005)
    Replies: 0
    Last Post: 02-13-2004, 01:49 PM
  3. chain and sprocket
    By Falcon in forum RS125 Euro-archive
    Replies: 11
    Last Post: 11-27-2003, 02:19 PM
  4. Chain and Sprocket kit HOW MUCH ?
    By 0the0mad0atter0 in forum RS125 Euro-archive
    Replies: 5
    Last Post: 07-03-2003, 05:51 AM
  5. Advice on chain and sprockets
    By eddy in forum RS125 Euro-archive
    Replies: 12
    Last Post: 06-09-2003, 06:00 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •