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Old 02-11-2012 | 02:23 PM
  #22  
jaka
 
Joined: Dec 2001
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From: Upplands Vasby, SWEDEN
Default RE: Need info on old OS 120 four stroke
Hi!
Take it apart and change the bearings!
All old engines that has been laying for some time need bearing replacement!
You should get around 8500-9000rpm with a 16x6 Zinger/Top-Flite using 5% nitro and 20% Castor oil.
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