CodyP 51 #1 Posted June 12, 2022 I have a 1968 raider 9 need to know what size bore for my idle tension pully to get I blew the bearings out but I just put a washer on the outside to keep running but the old pully is starting to separate so I need to replace it but don't know where to start normally I just measure the bore but since I blew out the barring's it's a larger bore so I am just frustrated I got terrible service so google has not been any help and neither is a parts store if I don't know the bore Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,251 #2 Posted June 12, 2022 For the idler pulley #7451 V-idler pulley - 4.000" OD - HD 52-4580 or 524580 replaced by WH 99-5678 or 995678 {$40.84} (Stens 280-362 HD 4.000" OD x .375" ID (1/4" offset) x 3/4" HT, Napa 7-05485 HD) V-idler pulley - 4.000" OD - Std 7451 replaced by WH 95-7668 or 957668 {$16.20} (Stens 280-313 Std 4.000" OD x 13/64" wide x 3/8" ID) The HD one has a real sealed ball bearing in it. 1 1 Share this post Link to post Share on other sites
peter lena 9,092 #3 Posted June 12, 2022 @gwest_ca those idler pulleys typically have a bearing failure issue , due to lubrication failure , when ever I replace one go for the biggest bearing that can always be bushed down to original bolt size , those larger bearings usually have the wider rubber grease shields , if you carefully remove the shields , pocket screwdriver . wipe out and carb cleaner , use lucas x-tra hd . 560 temp rated anti sling , polyurea rated . done that on all my related whining / noisy bearing problems . problems are gone , no noise or failure , realize this is not original , but it definitely stops the problem . having done this on all my stuff , this is the simple fix , pete Share this post Link to post Share on other sites
