head gasket failure?

[2000chevy]

Ok I know this is kind of against the rules but I really need help quick on this one. I bought a 1990 polaris 350l for dirt cheap and it ended up needing a top end rebuild. I got everything together and it read around 170 psi. the next day i went to put every thing back together on the bike but i put the tester on it again and it read 120 psi but it would still run. I went on to working on other parts of the bike and didn't think much more about it because I bought a used set of piston and rings. (I know broke another rule but dont have a ton of money to put in to it) I got everything back together and it wouldnt start. Put the tester on it again and it only read 90 psi. When I take the plug out and crank it it has a pretty bad smell to it. Would this be a head gasket failure? And do I need to buy new head studs to get it to seal right?

 

[Racer51]

I would sudjest taking the top end off and buying the recomended rings and get that cylinder checked out before you have to bore it and put on a new annealed head gasket. so it'll seal correctly. If it runs and the smoke smells bad yea you got a main bearing failure. or could be old clutch oil or bad gas but most likely a main bearing.

 

[Larry's Shee]

51, shift gears, he's asking about a polarus.

Op, did you use a new head gasket?

 

[Blaaster]

Op, did you use a new head gasket?

Did you stagger the ring gaps and hone the bore?

 

[phragle]

Did you use your harbor frieght armstrong torque wrench and pull a stud or two? did you do a leakdown test??

 

[Larry's Shee]

My bad 51, that is a smoker :-[

still wonder if OP used a new gasket, or as Phragle asked

 

[2000chevy]

i bought a new head basket and i honed the cylinder and yeah i pulled out two head studs during teardown

 

[Racer51]

My bad 51, that is a smoker :-[

still wonder if OP used a new gasket, or as Phragle asked

i know no biggie

i bought a new head basket and i honed the cylinder and yeah i pulled out two head studs during teardown

yea a head stud needs to be repaired or replaced or it'll probably 95% here cause an air leak how one fixes that i dont know ive never had to do it before. hopefully someone who knows will chime in.

 

[Blaaster]

And do I need to buy new head studs to get it to seal right?

i bought a new head basket and i honed the cylinder and yeah i pulled out two head studs during teardown

If the threads are in good condition and you can get the nuts off them with out destroying them, use them again but fit the stud with Loctite.

 

[2000chevy]

OK thanks guys ill let you know what I find when I pull the head

 

[2000chevy]

Nevermind the cylinder is scratched all to pieces on the exhaust side ill just sell the thing now