17 SBA runs on 1 cylinder - no spark

Hi guys,
have a new 17 SBA 800, only has 70 miles on it.
Last week ran fin did 20 miles.

Now barely starts and runs on one cylinder.
Changed the plugs and still the same.
Its the cylinder on the right (exhaust side)

Im new to sleds, but know motors.

Anybody experienced what could cause no spark on only one cylinder?
I pull the plug on the left cylinder will running and it stalls.
Pull the plug on the right and motor keep running like it was.
I play with the spark plug wire and still no change.

Anybody can help?
Thanks

Found the problem,

OEM spark plug cap was small that one plug fouled.
And as luck would have it, i wanted to ride tonight since we just got 15inch of new snow, spark plug that i bought from the store had a closed gap as well.
After some testing i finally noticed it.

OEM gap was small on both plug, so Gapped them to a more regular gap, all works good now.