Need help getting my Grizzly going

I have just acquired a 1998 Grizzly 600. The guy I got it from didn’t know much about the history of the bike, so I don’t know what all is wrong with it. Before I start sinking too much money into it, I want to see if I can get the engine to run. I have got spark on the plug, the starter spins, but it is really slow. I thought I could roll start it, but I don’t know if that is even possible with this type of transmission. When it is Neutral, I can easily push the bike, but when its in LOW, I can’t get it to budge. If I shift it to HIGH, it again rolls really freely (like its in Neutral).

I thought I should be able to hear the engine turning over, but I can’t. Is this "normal" or is this a sign that something is jacked in the transmission?

What I have done so far:
Changed the oil.
Washed out the gas tank and replaced the fuel line.
Disassembled and cleaned out the carb.
Replaced the spark plug.
Removed the starter and cleaned the commutator. Starter motor spins great on the bench.
I am able to pull the start rope and see a spark on the plug.

This is my first Grizzly, so I am sort of new at this. I do have a service manual for this bike.

Any info or insight would be greatly appreciated.

Thanks,
Kirk

Need help getting my Grizzly going

I have just acquired a 1998 Grizzly 600. The guy I got it from didn’t know much about the history of the bike, so I don’t know what all is wrong with it. Before I start sinking too much money into it, I want to see if I can get the engine to run. I have got spark on the plug, the starter spins, but it is really slow. I thought I could roll start it, but I don’t know if that is even possible with this type of transmission. When it is Neutral, I can easily push the bike, but when its in LOW, I can’t get it to budge. If I shift it to HIGH, it again rolls really freely (like its in Neutral).

I thought I should be able to hear the engine turning over, but I can’t. Is this "normal" or is this a sign that something is jacked in the transmission?

What I have done so far:
Changed the oil.
Washed out the gas tank and replaced the fuel line.
Disassembled and cleaned out the carb.
Replaced the spark plug.
Removed the starter and cleaned the commutator. Starter motor spins great on the bench.
I am able to pull the start rope and see a spark on the plug.

This is my first Grizzly, so I am sort of new at this. I do have a service manual for this bike.

Any info or insight would be greatly appreciated.

Thanks,
Kirk