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5391
Joined
10/1/2013
Location
Davis, CA
US
JM485
10/4/2017 5:50pm
10/4/2017 5:50pm
Edited Date/Time
10/5/2017 4:15pm
Long story short, I pulled the pipe off my RM to install a skid plate (don't ask, it was a nightmare), and upon checking the wear on my piston I noticed these odd flakes of something sitting on the top of the piston. I pulled the plug and this is what I found, I don't know what the heck this stuff is or where it came from. The inside of the pipe is a little rusty, so I made sure to get any loose rust pieces out, but I don't think that's what this is, it's too thin and flakey to me to come from the pipe. I also don't know how any of that could have made its way into the cylinder. The bike has been sitting for a while, could it be a product of bad gas sitting in a film on top of the piston?
I'm stumped, I've never seen this before and I have no clue what it is. Trying to race the bike this weekend which is why I started working on it in the first place, so if anyone has some ideas please let me know.
I'm stumped, I've never seen this before and I have no clue what it is. Trying to race the bike this weekend which is why I started working on it in the first place, so if anyone has some ideas please let me know.
The Shop
A two stroke gets supercharged by the pipe, that could absolutley be rust from the pipe.
via GIPHY
" class="img-fluid" />Hows the air filter look?
I would also start with fresh fuel and a new sparkplug.
FahQ: I know that when running the pressure wave within the pipe helps keep the charge from just blowing out the exhaust, but this bike hasn't ran in the last couple months. I'm still struggling to see how it would have gotten from the pipe into the cylinder, unless it happened from the kickstarted just slowly being pushed down by hand or something. I do think it has to be rust in there, but damn is it weird that it made it up that high, pipe looks new on the outside to. I also could have sworn I started the bike after I washed it last, but maybe I forgot?
Edit: Filter was all good last time it ran, I'm beyond anal about that. I'm just going to vacuum the crap out, put a new head gasket in, new plug, and call it good I think.
Paw Paw
could also be dirty gas....water leak in to the cylinder head area (head gasket) or even lead from the avgas
Post a reply to: Need some quick help, anyone know what this stuff is?