Riding half bike

When I ride the half bike or even push it it pulls to the right.I was wondering if anyone else has this problem and how you fix it if you have had the problem.The bike is not ride able the way it pulls to the right you cannot counter steer it.It rode good for about six months till this started.

Hi Bruce, Can you check your tire pressure? We recommend that the front and rear tires are kept at 3.5 bar / 50psi Alternatively, you can follow this tutorial halfbikes.com/tune-up Let us know how it goes.