Suzuki LT-R450 Forum :: LTR450HQ.com banner

1 - 8 of 8 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter #1
I just put a brand new 493 big bore with a je 12.8:1 piston and it smokes on start up then stops when warmed up,did compression test and came back with 170psi and only leaked down to 165 then stopped so I have no clue what’s wrong
 

·
Super Moderator
Joined
·
1,289 Posts
Did you seat the rings? it takes a little bit of time.
 

·
Registered
Joined
·
18 Posts
Might wanna start over. Re ring it and go from there. How to you break it in? Did you use motomans directions? And ride it like you stole it? That is how I did mine 2 yrs ago and no issues. Also try out the Facebook site there’s a lot of ppl on that site vs this one. Lotta good info and help.
 

·
Registered
Joined
·
4 Posts
Discussion Starter #5
yes I did 2 heat cycles then rode it like I stole it but it also holds compression at 170 over night and didn’t move so seems like the rings seated
 

·
Registered
Joined
·
3 Posts
I just put a brand new 493 big bore with a je 12.8:1 piston and it smokes on start up then stops when warmed up,did compression test and came back with 170psi and only leaked down to 165 then stopped so I have no clue what’s wrong
some things to consider. make sure your crankcase breather hose is not pinched, valve stem seals could be worn or even the valve stems could be worn, Ring gaps should of been checked , and orientated correctly. while the motor is warming up metal expands So things will seal better.
 

·
Registered
Joined
·
4 Posts
Discussion Starter #7
Alr I’ll check the breather hose but it has brand new valve seals didn’t check ring gap but made sure they were on the piston right the way it said to put them with the paper that came with the piston I think I’m just going to re hone it and go with a 13:1 wiesco
 

·
Super Moderator
Joined
·
1,289 Posts
Sounds like ring gap can be the issue.
Did you install the rings upside down?
 
1 - 8 of 8 Posts
Top