2-stroke crankshaft question - SV650.org

Nobbylad · 31-10-11, 04:55 PM

I have a crankshaft off a Honda Vision that was moving OK until I left it exposed to the elements (had the head off) for a few weeks and it got rusted.

I've stripped the engine and taken it out and can't get the big end to move, even after soaking it in 2-stroke oil.

Is it worth getting the big end re-pressed and then polishing the crud/rust off the crank (£20-25) or shelling out for a new crank (£80)?

31-10-11, 07:28 PM

If you can get a hold of parafin try soak it in that overnight ,,

Sid Squid · 31-10-11, 07:47 PM

If it has any corrosion on the crankpin or bearing it won't last long running even if you can get it to move.

Nobbylad · 31-10-11, 09:30 PM

I was hoping to get the bearing replaced, the rust is only surface rust and I'm fairly sure the reason it's stuck is a combination of the perished piston rings getting in there, plus some water/rust.

I'm right in thinking that to replace the big end bearing, they split it and re-press it right? So, will the rust on the journals do any damage or is it ok to just polish it up and re-use?

There's a place local to me that will fit a new big end bearing for around £20, so hoping to do that as a cheap option.

mister c · 01-11-11, 01:21 PM

Get one from a breakers, shouldn't cost too much

31-10-11, 04:55 PM	#1
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	2-stroke crankshaft question I have a crankshaft off a Honda Vision that was moving OK until I left it exposed to the elements (had the head off) for a few weeks and it got rusted. I've stripped the engine and taken it out and can't get the big end to move, even after soaking it in 2-stroke oil. Is it worth getting the big end re-pressed and then polishing the crud/rust off the crank (£20-25) or shelling out for a new crank (£80)?

31-10-11, 07:28 PM	#2
SpikeTM Guest Posts: n/a	Re: 2-stroke crankshaft question If you can get a hold of parafin try soak it in that overnight ,,

31-10-11, 07:47 PM	#3
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: 2-stroke crankshaft question If it has any corrosion on the crankpin or bearing it won't last long running even if you can get it to move. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

31-10-11, 09:30 PM	#4
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Re: 2-stroke crankshaft question I was hoping to get the bearing replaced, the rust is only surface rust and I'm fairly sure the reason it's stuck is a combination of the perished piston rings getting in there, plus some water/rust. I'm right in thinking that to replace the big end bearing, they split it and re-press it right? So, will the rust on the journals do any damage or is it ok to just polish it up and re-use? There's a place local to me that will fit a new big end bearing for around £20, so hoping to do that as a cheap option.

01-11-11, 01:21 PM	#5
mister c Member Mega Poster Join Date: Feb 2007 Location: Crewe, Cheshire Posts: 2,326	Re: 2-stroke crankshaft question Get one from a breakers, shouldn't cost too much __________________ Flickr: http://www.flickr.com/photos/croozenooze/ Facebook : https://www.facebook.com/colin.hughes.1213?ref=tn_tnmn Yoo Toob https://www.youtube.com/channel/UCjG...eMWUx4Ud2dK-yA

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