Help LT250r quad won't run.

[XFactor45]

I've got a 85 LT250R quadracer hasn't been ridden in years. I've rebuilt carb, tuned up, changed oil, cleaned air filter and fresh gas. Had it running better than when it was new. Running about 60 sounded like it ran out of gas but has plenty. Now will only start and run for about a second then die. Changed spark plug twice getting plenty of spark, checked carb, and rotor key. Everything seems fine but will still only start and run for about a second or two. I'm stumped and missing something it was just running to good. Please Help ready to go ride I miss it. Thanks for any help.

[chucked]

Have you checked compression?

[XFactor45]

Yep compression is good. Acts just like it's running out of gas but everything is working great in the fuel system. Starts on 2nd or third kick and sounds good for a second or so. Thought maybe a weak coil but good strong spark.

[chucked]

What is the compression?

[XFactor45]

compression is 107 psi

[chucked]

Thats aweful low. Ill check what its supposed to be tonight.

[chucked]

I couldn't find an exactly figure for a wear limit, but stock they are 172-178psi. I would try putting a cap full of oil in the cylinder and doing the compression check again.

[XFactor45]

I read my compression gauge wrong or typed it in wrong it is 207 psi sorry about that. I'm back to thinking it's a coil problem. It has good strong spark for the first few kicks then gets really weak. Check the coil out and it is a little out of spec. so I've got a new one ordered. If you have any other ideals I'd be happy to hear them.