Hey guys, I am very new here, but am in need of some advice. My bike ate a brand new piston I put in it after 5 minutes of riding (wiesco). The original reason for replacing the piston and honing the sleeved cylinder was that the bike overheated due to a broken coolant line on the trail. Mind you, I did the (failed) rebuild about 2 1/2 years ago. The reason for this is I joined the military shortly after my bike died.
So after I rebuilt the top end and resealed everything, I started it up with no apparent issues. I let it idle for 5 minutes max, then I took it out on the road to test. It ran good unless I went WOT; this caused it to completely bog. I wasn't surprised however because I had thrown all new jets in and I hadn't figured out the perfect mixture ratio yet.
About 5 minutes down the road I started to lay into it a bit more and more and then failure. The bike died and wouldn't start back up. The piston was not seized and was completely free. I am now at the point where I am finally able to take a look inside the engine.
The sleeve had a good amount of scoring and was beyond the point of rehoning. The piston is gauged up and has a bunch of scoring. The ring is locked in place at one specific spot and there is a half inch wide and a millimeter deep recession above this same spot.
Now my thinking is, my younger inexperienced self threw the engine together and didn't torque the head and jug down and there was too much room for the piston to catch on a lip which sent the piston pieces around the cylinder causing the damage. However, I'm not 100% sure and would like as many knowledgeable opinions as possible.
I just purchased a brand new oem jug and weisco piston. So my questions to you guys are:
What do you think caused this?,
If I install a new jug and piston will this failure reoccur?,
What are the next steps to getting this bike on the trail again?
Thanks guys! If this is not enough information, let me know and I will try to provide more
So after I rebuilt the top end and resealed everything, I started it up with no apparent issues. I let it idle for 5 minutes max, then I took it out on the road to test. It ran good unless I went WOT; this caused it to completely bog. I wasn't surprised however because I had thrown all new jets in and I hadn't figured out the perfect mixture ratio yet.
About 5 minutes down the road I started to lay into it a bit more and more and then failure. The bike died and wouldn't start back up. The piston was not seized and was completely free. I am now at the point where I am finally able to take a look inside the engine.
The sleeve had a good amount of scoring and was beyond the point of rehoning. The piston is gauged up and has a bunch of scoring. The ring is locked in place at one specific spot and there is a half inch wide and a millimeter deep recession above this same spot.
Now my thinking is, my younger inexperienced self threw the engine together and didn't torque the head and jug down and there was too much room for the piston to catch on a lip which sent the piston pieces around the cylinder causing the damage. However, I'm not 100% sure and would like as many knowledgeable opinions as possible.
I just purchased a brand new oem jug and weisco piston. So my questions to you guys are:
What do you think caused this?,
If I install a new jug and piston will this failure reoccur?,
What are the next steps to getting this bike on the trail again?
Thanks guys! If this is not enough information, let me know and I will try to provide more