Maxie_Monty Posted February 18, 2010 Report Share Posted February 18, 2010 Recently my left crank arm has become loose and needs tightening every 5 or so minutes of riding, not a particular problem as locktyte could solve this, but to closer inspection, when the crank arm is completely tight the arm still wobbles. any ideas? Quote Link to comment Share on other sites More sharing options...
stunt man t Posted February 18, 2010 Report Share Posted February 18, 2010 buy a new set and check the bb incase that needs replacing aswell Quote Link to comment Share on other sites More sharing options...
Captain Scarlet Posted February 18, 2010 Report Share Posted February 18, 2010 If your left arm crank arm comes loose, it creates a wobble, which then wears away at the taper as it is a softer metal than the BB it is contacting against. Once the taper has worn a tiny bit, no matter how much you tighten it by, it will always have a wobble and wear loose. New LH crank arm is needed, and ensure you tighten it during and after the first few rides on it. Quote Link to comment Share on other sites More sharing options...
matt.price Posted February 18, 2010 Report Share Posted February 18, 2010 hi mate i had the same problem. i was careless after getting a new crank arm and didnt tighten it up regular for the first few times. So the taper in the crank arm wore away. So i had to buy a new one. its the easiest thing to do... after getting a new crank arm tighten the bolt up for the first couple of times then now and again. and always tighten up the pedal. trust me ! iam careless on these things, and ive spent too much money on cranks thanks Quote Link to comment Share on other sites More sharing options...
alex-trials-boy Posted February 18, 2010 Report Share Posted February 18, 2010 I have also had this problem when i got my ZOO! pitbull i was told the crank arm was worn but i did'nt pay much attention so carried on riding, got to out riding spot and my left crank arm felt a little wierd, got home and took it of and saw what was ment to be a squear crant was more circular and squear turned out i had rounded it of but the bb was fine but it may be the other way round with you your bb and crank may be f****d good luck mate. Just take your crank of and fine the damage hers mine now as you can see where my index finder is If you get new cranks, every week or so when you look for cracks and things and just do a small service on your bike make shure your crank bolts are of the correct tension and this will never happen Quote Link to comment Share on other sites More sharing options...
Maxie_Monty Posted February 18, 2010 Author Report Share Posted February 18, 2010 (edited) Thanks alot people, taken the crank arm of today and does look like a far bit of wear, wasnt expecting it because i thought echo parts would atleast serve me a year lol. Will take a picture and post it up in the morning just to be definate if thats alright ? Edited February 18, 2010 by Maxie_Monty Quote Link to comment Share on other sites More sharing options...
Ben John-Hynes Posted February 18, 2010 Report Share Posted February 18, 2010 Could be the threads in your BB. Bolt comes loose, crank comes loose. Quote Link to comment Share on other sites More sharing options...
maxxis26 Posted February 18, 2010 Report Share Posted February 18, 2010 you could always use the wiki "coke can bogde" to get you through till you get a new crank arm http://www.trials-forum.co.uk/wiki/Coke_Can_Trick worked for me for 6 months on my middleburns, then i got smart and went isis Quote Link to comment Share on other sites More sharing options...
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