Razor E300 runs but very slowly

you put one of the pinion gears in backwards

1. rotate the rear wheel until the hole in the sprocket lines up with the tyre valve.
2. insert the tyre valve extension through the hole and attach it to the tyre valve
3. inflate the tyre to the correct pressure (usually 45psi)
4. remove valve extension and put in a safe place for next time.

Inflating the rear tyre is detailed in the owners manual, which you can download from the Razor web site.
http://www.razor.com/au/products/electric-scooters/e300/

Leave aside all the puffery about 3-1 and such, you described a front wheel drive (pull) walk-behind (FWD), but are asking why the rear wheels won't propel. When you push down the hand grip the front wheels should spin free. Whan you lower from wheels by releasing pressure on hand grips, turning wheels lowered to ground should propel the mower along with its unpowered rear wheels now turning be ground contact. Reminder, never, ever lift rear drive wheels of any mower off the ground while walking behind with engine running:

1. You could be struck by blade propelled object.
2. You could pull mower and spinning blade backward onto your feet.
3. You could lose balance and be pulled forward in a fall.

Contemporary FWD mowers are recognized by a black chain housing on deck top leading from engine to left front of deck. RWD propelling chains are situated underneath deck so cannot be seen from above.

probably bearings to tight take off wheel check axil see if it turns freely if it dont loosen up bearing screws untile it does turn freely reinstall

No. We get batteries from a local supplier and they work just as well. are by far the most common problem with razors because people dont keep them charged.

You need to adjust the clamp on the cable to shift the clutch both forward and reverse.

1. With a Phillips screwdriver loosen the two screws and remove the chain guard.
2. With a 10mm wrench loosen the brake cable anchor and disconnect the cable.
3. With two 8mm wrenches loosen the brake housing anchor and disconnect. (Keep the spacer and washers together.)
4. With a 10mm wrench loosen both axle adjusters an equal amount. (roughly five turns)
5. With two 17mm wrenches loosen the axle.
6. Push the wheel forward in the slots to loosen the chain.
7. Pull the wheel out. (Pay careful attention to the order the hardware is in there.)

Regards, Tomy

sounds like you need a new rear wheel as the wheel locking mech has been stripped or damaged where the cog is at. Can you move the wheel forward and backward with out the chain moving? If so that is your problem.

turn it off,let the drive handle go,pull mower backwards.does it lock the back wheels?if you push it forward,can you hear a clicking noise from the wheels?you should do.lift mower,spin back wheel,should either lock,or click,depending which way you spin it.they have spring loaded pawls that drive the wheel.usually easy to fix.usually dirt,or too much grease.take wheels off,have a look

either the wire going to the transmission is not tight enough and need adjustment or belt needs replaceing