Hi.month ago i install spy 5000 alarm.now the problem is ...cant start the bike because the alarm goes off always

Have you seen this online how-to guide? It appears to have the information you need. Installing SPY 5000 two way motorcycle alarm into Honda 1998 CB250...

No, not the spark plugs. Likely a limp mode from the bikes ECU. Your air box and filter modes may cause a lean fuel condition, not rich. Wait till you get and install your Power Commander. The ECU should reset when you disconnect the battery for the PC install. Make sure you get the right map for your PC.

Might try removing or disconnecting the alarm to see if you have tripped an anti-theft circuit on the bike. If you have then you'll need to refer to your owner manual or local Honda dealer.
If the bike works fine without the alarm then I would reset the alarm. I found the manual on Google pretty quickly

There could be an issue with the antenna. Is it mounted on the windshield? If so, try moving it to a different location. You didn't mention the year, make, model of your vehicle but, some cars have a filament in the windshield that interferes with RF signals.

The Spy 5000m is a great alarm but difficult to install.
You can get installation and user insttructions from this
site.
http://userguides.50webs.com/spy_5000m.htm

You need to adjust the tachometer sensing wire, it usually wraps around a spark plug wire so I can sense when the car starts. On my spy alarm, the wire was grey. Hope this helps.

Hi, Do you have an alarm & Immobiliser fitted on your bike as these drain the battery on your bike very quickly? If so i would recommend removing your battery and fully charging it with a decent amp-age charger. If you have your garage attached to your house then i would definitely recommend purchasing a trickle charger and when not using your bike keep this plugged into the mains and you should not have this problem again. all motorbike shops sell these chargers If after this the battery goes flat again i would suggest purchasing a new battery. This is a common fault as most motorbikes sit in the garage through the winter months and if not kept on charge will deteriorate. Hope this helps.

I?ll been trying to find the MANUAL of this new car alarm but I couldn?t so if you send it to me I probable will help you.

I would pay for an expert to install that alarm system.