Thread: JB Wield
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Old 03-14-2010, 08:31 AM
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Retmachinist Retmachinist is offline
Motorized Bicycle Elite Member
Join Date: Oct 2008
Location: Urbandale Ia
Posts: 637
Default Re: JB Wield

The only problem I have ever had with these Chinese engines is the rear mounting studs breaking do to the vibration. Now the first thing I do before I even install the engine is drill and tap the two rear holes to 8mm and use grade 8 cap screws. I have never had one of these fail no matter how bad the vibration. These motors are such a crap shoot on the vibration. It does seem like the last few engines I have purchased have been alot smoother. Maybe they have done something as far as the quality control?

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