hello!
there are some reasons behind hard starting of CNG car in morning.....i started my Nissan Sunny in 3rd kick but it need some smartness otherwise my driver stared it on 6th or 7th one :D..
so the reason behind that are:
1st::CNG Octane rating is high so it need time to ignite + cold engine Viscocity makes it more harder...
2nd::ur starter is designed A/c to petrol engine so it need more RPMs bcz of above mention reason....
3rd::if u don't properly adjusted plugs gap or carbon comes in plugs so it also give u hard starting + incorrect fuel mixture also cause this......
so there are other reasons behind this ...as cool says his GLi starts in 1st one so this is bcz his engine is 16000cc and can manage its compression but smaller engine will definately do the problem...so nowdays kits are coming which has automatic starting means ur car starts on petrol and when u hit adjusted RPMS like 4000 or 3000 so it will automatically switch on to CNG...so thats the better thing to start ur car early on petrol and the run on CNG....
Thaxxx