...its only a slight scuff,no sharp edges..is the piston a gonner..cheers chaps..(tried uploading pics,but aint a clue).
Is this piston useable....
-
tobytyke
- registered user
- Posts: 34
- Joined: Sun Jul 17, 2011 9:59 am
- Main scooter: li 125/mb 225 stage four/
- Contact:
On drilling a broken stud out...the drill rubbed against the piston... ...its only a slight scuff,no sharp edges..is the piston a gonner..cheers chaps..(tried uploading pics,but aint a clue).
...its only a slight scuff,no sharp edges..is the piston a gonner..cheers chaps..(tried uploading pics,but aint a clue).itll be ok . ive put big "X" marks on pistons, to hold oil in the bore before (my cast iron stage 4 has some of these on it, and its ran great for 1000"s of miles)
according to a mate of mine ..he was told by his tutors that using grit abrasive on moving ally components is a bad idea ..and that the grit becomes embedded into the ally and is impossible to removecoaster wrote:wet & dry.
any one care to disscuss ??
Its in bits scooter club: www.facebook.com/groups/132415046859320
yep ive heared that as well by TERRY F (RIP) always us a clean file
We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm
-
coaster
- registered user
- Posts: 3125
- Joined: Wed Jan 07, 2009 12:35 pm
- Location: London and Norfolk
- Contact:
He is probably right but so long as plenty of oil is used and you finish off with a fine grade I doubt there would would be any real problem. Plenty of people run open mouthed carbs that suck all manner of grit into the bore so a little caborundam shouldn't hurt. Having said that, that is quite a gouge and all I would recommend would be smoothing out any rough edges.RICSPEED wrote:according to a mine of mine ..he was told by his tutors that using grit abrasive on moving ally components is a bad idea ..and that the grit becomes embedded into the ally and is impossible to removecoaster wrote:wet & dry.
any one care to disscuss ??
-
warts
- registered user
- Posts: 7092
- Joined: Thu Aug 04, 2011 6:28 am
- Main scooter: honda
- Location: Fenland
- Contact:
Those old bike tuning books - "Speed, and how to obtain it" and "Tuning for speed" counselled the use of a file and claimed abrasive the work of the devil. I think most of that info was from the thirties. But fact is fact, however old it may be. But is it fact? I hear you say. Does it still apply on harder eutictic cast pistons?
Pistons are no longer very cheap, why take the risk? Goes for plain metal bearings too.
As far as the piston in question, looks ok, aren't there lots of holes right through 2t pistons? a mere scratch isn't likely to be noticed.
Pistons are no longer very cheap, why take the risk? Goes for plain metal bearings too.
As far as the piston in question, looks ok, aren't there lots of holes right through 2t pistons? a mere scratch isn't likely to be noticed.