BB331 Install Problems - Help Needed
#32
Went into the engine today. Took the head off and yeah, a thin layer of oil was on the piston.
I checked the piston rings and think it's possible they may be in the wrong order. But I'm not sure since this is a different piston and rings from the stock one.
(I tried taking pictures but you can't see the detail too well)
Why do I think they might be wrong?
The 250 piston rings are like this: top ring a bit smooth on the edges (not beveled; just smooth) with a silver color. Second ring edges kind of sharp (could almost cut your finger of you tried) with a dark color.
The 331 piston: top ring sharp with dark color. Second ring smooth edges with silver color.
What do you think? It appears they're backwards. But the question is, would those two being wrong cause the symptoms I'm experiencing?
Side note: installed the correct cir clips.
I checked the piston rings and think it's possible they may be in the wrong order. But I'm not sure since this is a different piston and rings from the stock one.
(I tried taking pictures but you can't see the detail too well)
Why do I think they might be wrong?
The 250 piston rings are like this: top ring a bit smooth on the edges (not beveled; just smooth) with a silver color. Second ring edges kind of sharp (could almost cut your finger of you tried) with a dark color.
The 331 piston: top ring sharp with dark color. Second ring smooth edges with silver color.
What do you think? It appears they're backwards. But the question is, would those two being wrong cause the symptoms I'm experiencing?
Side note: installed the correct cir clips.
#33
You should get a magnifing glass and closely inspect the rings. Some rings have beveled corners and need to be installed in the proper orientation (I believe this only applies to compression rings). So your ring in addition to be place in the wrong position, could be upside down.
I would go to the expert that has handled rings the most. The original manufacturer/provider for guidance. I am not an engine builder, only a worrier.
I would go to the expert that has handled rings the most. The original manufacturer/provider for guidance. I am not an engine builder, only a worrier.
#35
You should get a magnifing glass and closely inspect the rings. Some rings have beveled corners and need to be installed in the proper orientation (I believe this only applies to compression rings). So your ring in addition to be place in the wrong position, could be upside down.
I would go to the expert that has handled rings the most. The original manufacturer/provider for guidance. I am not an engine builder, only a worrier.
I would go to the expert that has handled rings the most. The original manufacturer/provider for guidance. I am not an engine builder, only a worrier.
#36
Might be my emails are being sent to his spam. I use a shared server and sometimes that happens. Think I'll try again with my yahoo account.
#37
Ok, I believe I pinned down the problem. From what I've been reading in other forums and piston ring manufacturers, the silver ring on top and darker ring next.
The top ring will sometimes have a coating. The coating on my silver ring is a bronze color. Comparing the two, I can see how someone would think that ring is the "dark" ring. I initially did.
I found this at Thumpertalk from someone with seemingly the same ring set. The poster's name is Wiseco...so possibly a company rep:
Source: Easy Piston Ring Question - WR/YZ 250F - ThumperTalk
Crossing my fingers this was the only issue...
The top ring will sometimes have a coating. The coating on my silver ring is a bronze color. Comparing the two, I can see how someone would think that ring is the "dark" ring. I initially did.
I found this at Thumpertalk from someone with seemingly the same ring set. The poster's name is Wiseco...so possibly a company rep:
Guys - the black ring with the sharp outer edge is the oil scraper ring, and it goes in the second groove. Make sure the marking on the ring near the end gap is up, or else you will scrape oil into your combustion chamber, and it will smoke like a pile of wet leaves on a fire. The copper colored ring with the silver outer face is the top ring. Put any markings on that ring "up" too. Be careful installing the 3-piece oil ring. Put the expander in first, then spiral in the bottom rail, then the top rail. Make sure everything is happy and floating free.
Crossing my fingers this was the only issue...
#40
ive done a big bore but on another engine
my rings had a top and bottom marking
and had to go in a certain order too
I also checked ring gap according to specs before installing onto the piston too
if the gaps are too tight I guess they could break, and I suppose to far apart not seal properly
and of course clock them correctly on the piston
hopefully these couple steps were not overlooked because the rings were already installed on the piston because it may take an extra 10min to check these things
but would save so much hassle later on
and never reuse cir clips if you had brand new ones
they cost nothing even if new ones needed to be ordered
my rings had a top and bottom marking
and had to go in a certain order too
I also checked ring gap according to specs before installing onto the piston too
if the gaps are too tight I guess they could break, and I suppose to far apart not seal properly
and of course clock them correctly on the piston
hopefully these couple steps were not overlooked because the rings were already installed on the piston because it may take an extra 10min to check these things
but would save so much hassle later on
and never reuse cir clips if you had brand new ones
they cost nothing even if new ones needed to be ordered