1717 muggy cog

I am having some cogging issues i think. Sometimes it cogs and others it rolls slow then hit with the throttle.

Setup
1717 heli
Mmm
6s 45-50c 5k tenergy pack(2 3s in series)
5.5mm bullets on batteries an 6.5 on motor
50/14 gearing pinion might be a 16 gotta double check
Any ideas

[nitrostarter]

What firmware are you running on the MMM?

I had a similar problem running the Neu 1521 in my XXL. When i was using the newest firmware, it would only roll very slowly unless I gave it a push. I tried all different settings, timing, start power, everything but nothing helped. I changed the firmware and haven't had an issue yet...

I started on 1.24 i think and now have the latest. Had the same effect on either firmware.

[nitrostarter]

Try 1.21

Thank you 1.21 worked like a charm....now I need to change the center diff fluid to equal out the power front to rear.