Question about 2008 Beta RR 250 M

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Chains slacken off

I own a 1998 RR 400 and have been having a lot of problems with the chain slack. I do around 250 miles per week in all weathers. I adjust the chain every weekend but within 100 miles or so of adjusting it to the correct slack it is already 'stretching' to around 40-50mm of freeplay

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Way outside the recomended slack (which is 20-30mm). Any suggestions as to what could be causing this? I am thinking there are two options: 1) the chain and sprockets are shot and need urgent replacement. 2) the rear axle bolt is shot and despite being tightened to the correct torque it is loosening as I ride. Has anybody got any advice on this? Any feedback is welcome. Adjust the chain to spec then mark the adjustment slider and the swingarm at a common piont on both sides of the wheel. Use a paintpen or steal some nail polish for this. Then see if the wheel moves as the chain slackens off when you ride. It sounds like your chain and sprockets are toast though.......,,

Posted on Nov 10, 2008

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There are videos in the link. The one for your bike is in Spanish, but just watch the picture, it is easy.

Basically, you slacken off the wheel axle bolt a bit. Then you turn the adjuster nuts on both sides the same amount, perhaps a quarter turn, then check the slack in the middle of the chain at is tightest part. Most chains have a tight section. Tighten up the axle and check again. In my experience, it goes tighter as you tighten the axle nut.
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I have a nissen primera 18000 the malfuntion light stays on indecating timing chain is stretched and needs replacing. only done 45000 miles. it only came on when bad weather started. could be sensor. any...


the chain could be worn - check it before you suspect anything else... dont go off the mileage - lots of things can make a chain or belt wear prematurely, have it checked to be on the safe side.
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Try cleaning the area around the timing chain of all grime and oil, and re-oil the timing chain with the reccomended lubricant.

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Chain keeps coming off


Sir,
What you need to do is adjust the rear wheel to take up the slack in the drive chain.
You by now have possibly ruined both the sprockets where the chain need to be securely located.
To take out the slack the wheel spindle will have to be loosened and adjusted by the two clamps around it they are on each side of the swing 10mm nuts used for this purpose.
To replace chain and sprockets the wheel needs to be removed so I suggest purchasing a Haynes manual or similar to study involvement.
Good Luck!
Paul 'W'
Onyer~EDson(:0) {#><U.K.
Please remember to politely rate my effort!

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1 Answer

Chain problem


I noticed a repetetive whirring coming from somewhere near the front sprocket- Or at least I'm pretty sure that's where it's coming from. It's not quite a grinding but it sounds like some sort of contact problem. I jacked up the bike, and the rear wheel spins freely in neutral except for a small area which seems to need just a *little* more force to spin around. Not sure if it's from the rear wheel or from whatever might be wrong up towards the front. The noise has an accompanying gritty feel, which rather reminds me of a bent rotor rubbing lightly at a certain point once per cycle on the brake pad. No amount of variation of pressure or speed in braking seems to affect the problem. There's no obvious performance issues, and I only hear it when I've got the clutch pulled in (probably because it's not loud enough to hear over the exhaust, not because it isn't happening). I ran the bike downhill in neutral and it still makes this noise. I lubed and adjusted the chain a day or so ago, and the adjustment notches are at the same point on each side. I had also ridden over a set of train rails cut deeply into the road, but I doubt that had much impact on anything. Any ideas?,Sounds like your chain may not have stretched evenly. You also may have it adjusted too tightly. You should always adjust the chain so that you have the specified slack at its tightest point. Do you know how many miles/KMs are on on this chain/sprocket set?,,,

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