My bike dont want to start

was the gasket the only thing you replaced
or had the the head reconditioned and checked for warp
do some checks
confirm you have fuel and spark to the motor
if no better
do a compression test

Get great insurance, then have someone ste^! it and tuch it

Definitely the head gasket mate water cant really get above piston any other way - the piston would be sucking water into it on the down stroke then on the up stroke water would be passing pass the piston rings into sump oil
the only test you can do with out the bike started is a compressed air leak down test I happy to elaborate on this test if you need but if you do all your own rebuilds then I sure you know all about it..
when you take head off to replace gasket I would highly recommend you get the face of the head machined as pretty much any head that age in my experience at least would have some warpage to the face which will become harder and harder to get good head gasket seal even with new gaskets also if budget allows this would be great time to consider new piston and rings kit even new cylinder as its all apart any how if you can afford it would be very worth while
when you get running again I would also change that oil completely and oil filter every ride for at least 2 or 3 times to make sure all that water is all gone - or it will bite you later with far worse problems than head gasket issues

you dont have to pull the whole motor out of car if thats what your asking but theres alot of work involved with changeing head gasket

it sounds like you have an air leak on the manifold try nipping up all the bolts first, then start the motor and if its still doing it give all the gaskets a swill over with WD40 to find out witch one is leaking the one that is will stop leaking for a very short time,,,but you should find it this way, it is sucking in secondery air some were,,you will need to change the gasket thats leaking i hope this helps

Sounds like the timing is off. Re-check your timing marks. If it has a timing belt it may be a few teeth of and getting no compression. Why did you need to replace the head gasket? If you overheated the motor it may have cracked the head causing a weird noise, but I would start with the timing first. That is the cheapest test.

the battery is charging ok if not the bike wouldnt run-ur starter motor needs inspection-maybe the rotor or brushes r froze-1st chec wiring that gos to the starter-could be loose or bad-with a manual u can disasemble n test the motor-ni dong ma zai jian

why was the head gasket replaced?,whitch motor do you have,most likely answer is that the timing got messed up during the repair,,pretty sure that you have an interference engine,whitch means if the timing is off or the belt breaks when you try to start it the pistons hit the valves and bend them,if you have the dohc 3.0L. this will happen,check the timing marks and hydraulic belt tensioner,for proper range of tension,if it looks ok do a compression test to make sure you dont have valve damage,if that all checks out,check fuel pump pressure at the rail,and if your getting spark

have you messed with the timing ov the bike if not are you sure the gasket is not leaking and sucking in air test the compresion on it

the countershaft seal can be pried out easily,just dont do much damage to seal surfaces(on the motor).

as to your jetting problem,put the clip on the main needle back to "stock".

and buy several "main"jets,larger,and,smaller.
"jet-tests"MUST be done after a high-speed test(check sparkplug color,should be "tan")

poping,most all the time (on bikes)is caused by an air-leak somewhere along the exhaust system,

ALSO,when you change:
cams,
airbox,
exhaust's
--it's a GIVEN to re-jet the carb!!