Jump to content
Sign in to follow this  

yz125 connecting rod getting stuck HELP!

Recommended Posts

just got my crank back from rebuild installed it with new bearings then closed the case and then i put a new piston and cylinder on. The connecting rods bottom end part seems to be getting caught up in the from of the cases. any suggestions on what to do. also i noticed the pistons front exhaust arrow is not perfectly straight. bad crank rebuild? or did i do something else wrong.

Share this post


Link to post
Share on other sites

did you get a new rod, or use the old one with new bearings?? could be worn bad, or bad crank job. it happens. in some cars the rod is posed to face one way only, don't know if bike do that too.. never seen an arrow not point straight, something ain't right.....

Share this post


Link to post
Share on other sites

all new bearing and rod. would a slight bend in the rod cause this or the fact that the dealership didnt true the crank.

Share this post


Link to post
Share on other sites

i think most bike rods are the type of metal that will break before it bends. i think the problem has to be in the crank

Share this post


Link to post
Share on other sites

well i just got a cheap new crank off ebay and am going to try that. this is my project bike and thats all i need for reassembly. if i get the same effect then i dont no what it maybe. ill post what happens when i get the other crank in.

Share this post


Link to post
Share on other sites

They might have put a veshra rod on it which will cause it not to clear the cases when rotated. you will have to clearance the front and back of the cases to accommodate some aftermarket rods. Some of these rods are larger on the big end than the OEM part.

that's why I stick with OEM parts, I hate surprises.

Share this post


Link to post
Share on other sites

I think you are smart not to mod anything until you find out what's hokey here. Your crank probably wasn't trued correctly.

When they fail to true it well, the rod bearings turn fine but everything binds up when you sandwich it in your new case bearings...

I hope you get it worked out. Sounds like a PITA :thumbsup:

Share this post


Link to post
Share on other sites

There's nothing wrong with your crank, I've done thousands of cranks and this is common with some aftermarket rods.

Share this post


Link to post
Share on other sites

I kinda ran into the same problem when I did my top end rebuild. Everything moved freely until I put any type of torque on the cylinder nuts. Turns out the cometic gasket was way thinner than the oem gasket and the crank was hitting the cylinder when tightened down. I just used double gaskets and I was fine.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

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

Reply with:

Sign in to follow this  

×