Motors need help finding a pinoin

cobieg

Member
Ok, so I am working on a project that I am changing from brushed to brushless motor. The problem is, the shaft on the new motor is 3.5m. I need a pinion with 14t. I bought one today, but it dosnt mesh with the main. Is this because the new gear is bigger diameter ( 7.85mm old is 6.25mm ) ? How do I find the right pinoin ?
 
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