[Tamar]

Tamar.
In your photo above, are the gears as per the spec below?
If so, did you have to sleeve the motor shaft to get the small can spindle out to 2mm for the pinion? 
How do you stop the motor coming out of mesh under hard impact?
Alan
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Scaleauto sc1151 17.5mm 31T sidewinder crown
Mitoos m214 nylon 8mm 14T pinion
25.5mm total , 12.5mm separation
0.5mm tighter than Slot.IT sidewinder gears.
Ratio 2.21
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Hello Alan, you were almost 100% spot on for the gear specs. But its a 14T nylon Sigma pinion with an OD of 7,8mmø
The two motors crews are more than capable to keep the light MX16 in place...but to make absolutely sure for major endurances...
...once mesh and gearing is set... glue the whole lot in place 

A good reference on how I prep my SW motor pods can be found in this post of the Ford GT-LM

With kind regards
Tamar