i just did a full  top end rebuild, all new, had it running to idle , was idling for 10-15mins warm up then rode it for 30mins to break in put it away and came back next morning and it was seized up, im thinkin cold seize because of the weather and my storage not being heated. let me know more info if u guys know anythin thanks

10-15 minute idle time??? That is a sure way to over heat and ruin an engine

Make/model/year?

1990 Husky 125 wxe , about 10-15mins not exact just made sure was warmed up but ran fine no noises when i put away

when i parked it in my storage the pipe wasnt even that hot so i know it didnt over heat, has all new fluids, i just hope new piston isnt damaged

Pipe temp means nothing, it is internal barrel temp.

At idle, oil pools in the crankcase and temps become localized and skyrocket. Transfer ports stay sport of cool, exhaust ports over heat. Idle time should be just long enough for the bike to accept throttle. Then you ride it gently to bring the entire engine up to temp. There are tons of threads on proper 2S break in procedures.

Pipe temp means nothing, it is internal barrel temp.
At idle, oil pools in the crankcase and temps become localized and skyrocket. Transfer ports stay sport of cool, exhaust ports over heat. Idle time should be just long enough for the bike to accept throttle. Then you ride it gently to bring the entire engine up to temp. There are tons of threads on proper 2S break in procedures.


oh ok thanks for the info, do u think it damaged the piston ? im going to take apart shortly
2 minutes ago, RideRed600 said:

 


oh ok thanks for the info, do u think it damaged the piston ? im going to take apart shortly

 

No way to know until the barrel is pulled. Some will only pull the pipe and look at the piston through the port but you can only see 15% of the piston so....

No way to know until the barrel is pulled. Some will only pull the pipe and look at the piston through the port but you can only see 15% of the piston so....

ill take whole top off

cold seize doesn't have anything to do with the weather or storage, cold seize is when the piston expands faster than the cylinder due to insufficient warming up of the engine before hard riding.

ah ok not cold seized then thanks for the info

I'm thinking the crankshaft is bad.  Did you check back and forth play in the rod/crank bearings when you rebuilt the top end?  Was your air filter dirty prier to the rebuild?  If the crank bearings are bad it will be seized so that could be it.  If not i have no idea.  :confused:

nope rod was in great shape everything was good , im a lil confused too

air filter was cleanned not best shape tho

IMG_1699.jpg
piston is fine its like stuck

10 minutes ago, RideRed600 said:


piston is fine its like stuck

You cannot tell by looking at the top of the piston, you needs to check the sides. If the piston is seized to the barrel, getting the barrel off will be hard to do. If it slides off, then it is probably the crank. Remove the barrel.

You cannot tell by looking at the top of the piston, you needs to check the sides. If the piston is seized to the barrel, getting the barrel off will be hard to do. If it slides off, then it is probably the crank. Remove the barrel.


cylinder and piston is fine its deff the crank it doesnt even budge

12 minutes ago, RideRed600 said:

 

 

cylinder and piston is fine its deff the crank it doesnt even budge

Sorry to hear. Either get it rebuilt or a replacement crank. That sux.

Sorry to hear. Either get it rebuilt or a replacement crank. That sux.

yea suks parts for this arent very commun

bummer dude, good luck

If you can get a new rod and bearing, I can rebuild the crank for you. I run a MC/ATV shop in UT. For thumper talk friends, I like to help out for cheaper if I can. Either trades, or some $$. You will need to see if the rod bearings are trashed, or the side crank bearings.... Which means you need to pull engine and split the cases. Is that something you're comfortable doing? 🏍️

yea ive split cases couple times , im in NY , i jus dont want to put anymore $$ into this if i really dont have too u know

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now