2000 Grizzly 600.

[Randomnumber73]

I'm working on my uncles grizzly and it sparks once on initial cranking then no more after that. If I let off the start button then press the start button again it will spark once then stop sparking. I was wondering if anyone seen this issue before.  Also I've never used forums before so sorry if this question is in the wrong location.

[Gwbarm]

There are many things it could be, but the way you describe it sounds like its loosing connection after initial spark maybe arcing from a loose ground. I would check to make sure the coil is grounded and also that you have good ground to your CDI. You know you are getting voltage there or it wouldnt spark at all, if all that checks out you can check the harness and start switch for possibly corroded terminals. I assume you have tried a new plug.

[Mech]

Yup, check the power supply and the earths to the cdi unit, and check/clean the main switch and the kill switch contacts. Clean if possible(kill switch) or check with an ohm gauge.

[bdejong]

it is the coil. Had this happen to me and had a second unit to swap parts. Did everything except for the coil as you need to drain the oil to replace it.  If I remember correctly,the coil sent that much.