Expertise advisory requested!!!; novice motorcycle enthusiast

Bought from www.megamotormadness.com, brand-new, January 2016 for $899.00. Features a GY6 150cc motor, automatic transmission, 12" aluminium wheels (90/90-12), and came with a trunk kit (not installed).

Received unit 85% assembled, in crate. Successfully started, after installing front wheel, new 10W-30 oil, and later installed Universal Parts GY6 (Blue) Performance CDI in place of stock. Runs clean, smooth, on highway 65-70mph top speed.

Notes:
The left brake trigger is non-functional; at the back of the left switch cluster is the brake cable support, which is defective from factory. After the CDI upgrade, the RPM gauge on the instrument panel does not raise past ~4000 RPM at top speed, possible defective. June, 2016; bike begins to exhibit start-up issues, after OFF for 1+ hours, vehicle experiences no response from electric starter, though battery is fully charged. Kickstart initiated, the bike starts 40% of the time after 4-5 kicks; possible gearing issue and/or electrical.