two stroke Yamaha HELP Spark/fuel /compression mag side out

[yamadoo]

Sorry off topic, but this site is the best help on line

98 600 twin XTCD mag cylinder not firing.
Cleaned carb, choke seems to return nl, has spark and the compression is 145. Seems to be flooding out. Reeds look ok. SWitch plug wire sides and still mag side not fire. Disconnect pto side with either plug wire and sled dies. Going up north and this is the wifes sled.
HELP APPRECIATED
Any ideas for help
THanks Yamadoo

 

[markgyver]

sounds like you still have a carb problem.needle and seat most likely.i would shut the fuel off for a minute and as long as it has a good plug it should fire.

 

[lowboy]

recheck your needle and seat on that carb remove seat check behind for dirt if okay look at reeds on that cyl and piston skirt while carbs are off if all his okay check pulse line for fuel you may have bad diapharm in fuel pump

 

[yamadoo]

Thanks guys. Will re look at needle and seat. Not sure I understand fuel pump diaphram affecting only 1 of 2 carbs can somewone explain that? The sled is at a buddies heated garage so I can not look to see if there is separate fuel lines to each carb or a common line.
Thanks I will check.
Yamadoo

 

[Sled Dog]

If you have spark and compression then it has to be starving for fuel or flooding.

 

[RX1 Yooper]

I could be a bad crank seal of cylinder base gasket.