I don't know that the flywheel balancing is sus. They look to be drilled quite carefully and no two are alike, and logic tells you they have been balanced in a computerised balancer. My best guesses would be the cast cranks not being checked for cracks or flaws in production. A bad one comes through occasionally. Also a step or score in the crank can create a failure point. The 124 crank looks like it snapped right on the step down. At the rpms we spin these cast cranks and abusive treatment we give them, its a wonder more don't fail.
jailing motor?
- Thread starter salvage
- Start date
Help Support Mini Dirt Bikes & Pit Bikes Forum:
Cactus Jack
Master Spanner Spinner
- Joined
- Jan 18, 2007
- Messages
- 2,512
- Reaction score
- 48
How many 55.5 or 59mm Lifan cranks have busted on you Mack ?????
coolmodee01
VCM B Grade 2013 Champion
ntn *** and skf bearings up to 30mm i.d are made in tiawan weather printed or not i know this as my sister company is the direct importer of ntn
as for the crank i'm not sure if its a visable issue but more a casting issue
if you look at where my mates snapped you can see what looks to be air bubbles in the steel
but hey i reckon we are near done with this one good stuff
as for the crank i'm not sure if its a visable issue but more a casting issue
if you look at where my mates snapped you can see what looks to be air bubbles in the steel
but hey i reckon we are near done with this one good stuff
