Chain idler question

Doopmaster

New Member
Is it absolutely necessary to install the chain idler? I have my whole motor installed with chain but I forgot to put the chain idler on and the chain has 1/2-3/4 inch deflection. Thanks
 
a new chain will get longer so yes you need it old chain not so much.only other option is shims on motor mount. ride safe BOBdance1
 
I don't use a chain tensioner/idler. Though I do have the alignment almost perfect between engine and wheel sprockets.

I only recommend using no tensioner/idler though if you have horizontal dropouts and a dérailleur to tension the pedal side.
 
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