chain slap???? at low RPM


18 replies to this topic
  • bakeyz426f

Posted October 31, 2009 - 05:06 AM

#1

i have about 2inches oh slack in my chain and i hear a rattle or slap if i let the rpm get to low and then hit the throttle. i read something that said when they fixed there chain slider it fixed the slap or rattle. i have a 01 wr426f and was thinking i need a new chain for it because i cant adjust the chain much to make it tighter. the manual says something like 2in. of slack is want you want and im wondering if thats too much? also what size chain should i buy if i get a new one? what brand is cheap and good quality for a chain? thanks

  • ww44wrf450f

Posted October 31, 2009 - 05:44 AM

#2

First off-make sure that the rear Hub's bearing's and seals are good , if there worn your $200 investment in a chain and sprocket set will be short lived. The stock chain is a D.I.D. v520 o-ring 114 links, vortex or ironmans are good sprockets. Stock gearing on a 06wr450f is 14/50, your 426?, you order the chain 120 links and grind a link out to the required links needed for your gearing change! What kinda shape are the adjuster bolts and nuts, change them out with ss metric's grade 8. Make sure you don't strip the heads on the sprocket bolts.

  • KennyMc

Posted October 31, 2009 - 11:37 AM

#3

The slap comes from the plastic guide that goes around the front of the swingarm. I put a thin piece of weather strip on the swingarm and the slap has gone away.

  • oakhillbiker

Posted October 31, 2009 - 11:50 AM

#4

I would like to see a picture of that.

The slap comes from the plastic guide that goes around the front of the swingarm. I put a thin piece of weather strip on the swingarm and the slap has gone away.



  • thatraptorguy

Posted October 31, 2009 - 07:01 PM

#5

+1 me to

  • fireblade reject

Posted November 01, 2009 - 12:06 AM

#6

I've a WR450F 08. It makes an awawful clatter under hard acceleration. I thought it was coming from the clutch as stops when the clutch is pulled. It's got less than a 1000 miles on it. After reading this thread I'm thinking it could be the chain.
cheers

  • ww44wrf450f

Posted November 01, 2009 - 06:08 AM

#7

I would like to see a picture of that.


you put the weather stripping under the chain slider's, top and bottom of the swingarm.

  • MEBANE NIGHT

Posted November 01, 2009 - 07:52 AM

#8

I put a bead of caulking under mine or se a bead of sealer ..

  • KennyMc

Posted November 01, 2009 - 09:24 AM

#9

The weather stripping is just the kind you buy at home depot. I sliced it in half to reduce the incremental height.

As also mention, caulking or bead sealer will work. The intent is to stop the plastic from going up/down and slapping the swingarm. Go out and pull up the front half of the guide and see how much "play" there is. Dual sport street riding really magnifies the issue. That's what got me to make the fix.

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  • bakeyz426f

Posted November 01, 2009 - 09:28 AM

#10

r u talking about the whole bottom of the swing arm you but weather stripping on? i have this foam insulation that is sticky on one side that might work well. its the stuff you use to wrap around pipes to keep them insulated.

  • KennyMc

Posted November 01, 2009 - 09:50 AM

#11

r u talking about the whole bottom of the swing arm you but weather stripping on? i have this foam insulation that is sticky on one side that might work well. its the stuff you use to wrap around pipes to keep them insulated.


The stuff I used was just typical weather stripping. I sliced it in half to keep the height down. I put this just on the top portion of the swingarm.

Posted Image

  • bakeyz426f

Posted November 01, 2009 - 03:15 PM

#12

did you do something like this?
Posted Image

http://motoman393.thumpertalk.com/

  • KennyMc

Posted November 01, 2009 - 03:37 PM

#13

Yep:thumbsup: You just want enough thickness to dead'n the noise. Have you tried it out?

  • bakeyz426f

Posted November 01, 2009 - 04:01 PM

#14

no i havent got around to fixing it yet. im in the process of replacing the timing chain and yz timing my bike. i took the seat, tank, and endine brackets of so now im ready to take the valve cover off. i think the yz timing will be better on my wr426f for me. i liked my old yz426f but i sold it when the timing skipped due to a streched out timing chain and the valves broke and destroyed the head. i swapped the wr suspension with my old yz426 suspension so im trying to make it like my old bike. my wr426f wont pull 3rd gear wheelies like my yz426f did. i think the yz timing mod will help give it the same power as the yz426 had. thanks for your help. ill try to fix it sometime this week.

  • viking50

Posted November 01, 2009 - 06:17 PM

#15

Wow! Any of you guys try adjusting the chain to the CORRECT tension? Check your owner's manual, 2 inches is too much. 1.5 - 1.7 inches

  • bakeyz426f

Posted November 01, 2009 - 06:31 PM

#16

mine says 1.6-2 inches

  • KennyMc

Posted November 01, 2009 - 06:35 PM

#17

Wow! Any of you guys try adjusting the chain to the CORRECT tension? Check your owner's manual, 2 inches is too much. 1.5 - 1.7 inches


No, I try and adjust it to the INCORRECT tension:bonk:

Manual = 1.9" - 2.3" which also equals 3 fingers.

  • SXP

Posted November 04, 2009 - 06:35 AM

#18

The chain slack is different for the steel framed and Al framed bikes. I own one of each - different specs!

  • GCannon

Posted November 04, 2009 - 04:34 PM

#19

There are many threads on this:
Take the swing arm off for service of the bearings while its off inspect the swing arm under the front chain slider. You may notice a lot of wear in the aluminum swing arm caused by the slider and chain.

either use the weather strip or silicone glue. I have had great luck just gluing the slider onto the swingarm with silicone. this will prevent the wear of the aluminum. it works great and is cheap. Just make sure you get the sider in the correct position before gluing.




 
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