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You didn't provide enough information.
Is the belt slipping?
I use a purple spring to prevent slippage.
 

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Tires?
Terrain?
It all matters
 

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Discussion Starter #4
I have 28" dirt devils lookin for more low end . new belt 1.5 mm shim + 450 weights
 

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The weights won't help from a take-off. The weights are in the at rest position and don't have an effect until the speed starts to increase. Lighter weights increase the engine speed for a given ground speed.
I can put 2.5 mm's of shim in my 660, but some can't take but 2 mm's.
For those tires you need primary machining and some shim.
You can add a signature, listing your machine and this shows in every post.
 
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