new piston and rings

[Tosh]

how long to run in new rings & piston,not had a re bore it lost pin in piston and broke rings,std 66mm bore

[dapper]

You don't say what type of cylinder it is. If it's nicasil lined, then about 250 to 500 miles. If it's cast or steel lined, then around 1000 miles.

[fred]

did you check piston,bore clearance? if above 3.5 thou,then a few hundred miles should do.

[mick1]

IMO.....if your barrel hasn't altered and it's just new rings/piston then 50 mile should be ok....but that's my opinion..

[soosh]

IMO.....if your barrel hasn't altered and it's just new rings/piston then 50 mile should be ok....but that's my opinion..

That's a good opinion too as my new piston went in and then used as normal,no worries.

[Muttley McLadd]

1000 miles?
There's some barrels would be half worn out by the time they've been run in!

[bristolmod]

has it been rebored to suit?

If not then I'd go with 50/100 miles as long as you've "glaze busted" the bore

Chris

[Tosh]

thanks everybody for the reply`s,its a cast barrel,no need to re-bore only a very very small chip on exhaust port but that`s sorted,1700 miles,3thou clearance on piston and ring gap 10thou