Rebuilding my brother-in-laws Mugello 186 motor ant the cylinder head has a lot of pitting etc from when the small end bearing fell apart. Can anyone tell me if this can be clean up and used or is it better to get a new cylinder head?
20150520_165756 by Paul Davies, on Flickr
Lambretta cylinder head damage
-
- registered user
- Posts: 1741
- Joined: Wed Jan 07, 2009 8:42 am
- Main scooter: Lambretta TV175 S3- what else!
- Location: Bali-Hai bar, Locarno Ballroom Bristol, 1967!- mines a Brown Split!!
- Contact:
I'd say clean up and use.
Scootering since 1968.
-
- registered user
- Posts: 146
- Joined: Thu Feb 26, 2015 3:54 am
- Main scooter: not yet
- Location: Bangkok
- Contact:
If you have a dremel with small sanding cylinders
don't use the tool but just sand the squish band to knock of the sharp bits . Then finish off with some finer 200 grit. The sharp edges will promote detonation if the engine is prone to it. It doesn't have to be like a baby's bum but the smoother the better. This method involves time, effort and dust.
don't use the tool but just sand the squish band to knock of the sharp bits . Then finish off with some finer 200 grit. The sharp edges will promote detonation if the engine is prone to it. It doesn't have to be like a baby's bum but the smoother the better. This method involves time, effort and dust.
- DickieD
- registered user
- Posts: 37
- Joined: Wed Apr 07, 2010 8:12 pm
- Main scooter: 1970 GP 200
- Location: Plymouth
- Contact:
Cheers for advice so far. I have managed to get out the garage today and clean up the head but still not 100% happy with it. Some of the damage is deep. Has anyone ran one like this without any problems. If it was for me I would run it as is but it's not my money so need to make sure.
20150526_161805 by Paul Davies, on Flickr
20150526_161805 by Paul Davies, on Flickr
-
- registered user
- Posts: 650
- Joined: Sat Nov 24, 2012 7:59 am
- Main scooter: Gori200, rt195, ld150,rb20
- Location: Bakersfield, CA
- Contact:
You should really have the damaged part cut off the head and then run a thicker head gasket to make up the height difference. I'm sure after all that sanding work the sealing surface if far from flat and will always cause problems.