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I bought a 2006 GV about a month ago.  It has a little over 2500 miles on it.  I drive it almost everyday for errands (I'm retired).  Love the scooter and it has never had any issues in the couple of hundred miles I put on it.  I did put in an iridium plug a couple of weeks ago and it seems to run a little smoother now.

Yesterday I was riding down the highway about 55 mph and the engine just died. There were no unusual sounds or clunks or anything, it just stopped running.  The motor turns over, but does not fire.  At first I thought I simply ran out of gas as I don't believe the gas gauge works - it always reads full.  I always put a little Seafoam in gas when I add it(maybe an ounce per gallon). After trailering it home I put some gas in, but still not firing. I pulled off the front cover to make sure the spark plug was connected, but it still is not firing.  I think it fired once, but very weakly. 

Any advice on a checklist to go through before I bring it in for repair would be appreciated.

New to Forum and  I am wondering what the Plug Number is for an iridium plug for the Grandvista.  Can the plug be changed without taking off the body panels?

Also,  I took off the six screws off the air filter cover to take a look at the air filter, but the cover still doesn't want  to come off.  Is there a trick to getting it off - it seems like something was binding on it near the front.

It's a 2006 Model that has a very high idle when you first start it (it starts just fine).  After riding for a while the idle seems to go back to normal, but it doesn't run smooth, smells like it is running rich.  The scooter hasn't been run much over the past two years, so I put some Seafoam in the tank.

At normal driving speeds it runs great.

Any tips would be appreciated.