So things are getting weird.
For clarity, other than popping out of gear which is the reason for the tear down, my it250 runs super crisp. Gobs of power. Compression is spot on.
After taking the cylinder off, the piston looks perfect. Zero scoring on piston or cylinder. Rings also look perfect. So I didn’t plan on doing the piston which is a happy surprise.
However, here’s where things get weird. WTF… the connecting rod is bent. Slight bend to the left. How the F did this happen and why does the bike run great?
The only conclusion I came to is that before I bought the bike I assumed the previous owner seized the motor in a gnarly way, hence the slight rod bend, which is still impressive to bend a rod. So I assumed I’d now be at the 2nd or 3rd oversized piston.
Extra weird: nope. I’m at the stock size piston and cylinder. How the F did the rod bend?
Is it possible the dude replaced the entire cylinder and piston with a STD size? That seems unnecessary.
Is it possible when I submerged the IT in water in the pines, it got water locked for a second and that created the slight bend? I doubt it since I turned the bike off right away and pulled plug to drain water before starting it. Nothing makes sense.
So that’ll be another $150 to replace the crank and rod. Shit.
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Published - Jan 15, 2011
Did the carbs on my 1987 cbr250r today. Way more headache than anything Honda from the 70’s. 1) Get all the plastic shit off 2) Get the carbs out. Man that shit looks different, Never seen carbs under the tank before. 3) New OEM air filter. That old one was seriously black as shit. 4) […]