RUNNING NEW PISTON..

[TROJAN6]

Afternoon Gents

Replacing the piston on the Race Rapido from Asso to WOSSNER, after a heat seize, did nt really rate the ASSO that was in the engine at all.....wondered what the best mileage for Running the new piston in again, could nt remember if it was 200 OR 500 Miles to suit.....cheers

[Warkton Tornado No.1]

Everything depends upon how you define "running in" because opinions vary.

If your new piston & rings are in a freshly honed bore with a good cross hatch pattern & the clearance is about 0.0035", then ride your scooter for a few hundred miles gently accelerating, constantly going up & down the gearbox, being prepared to rev the engine (more revs = more cooling) & never labouring the engine. That is as good a start as you will give the engine. If you encounter a steep hill, ride up it with the engine revving in a lower gear. If you encounter a steep hill, ride down it with the engine revving in a lower gear, pulling the clutch &/or using brakes if necessary. Do not roll off the throttle as that is when the bore gets least lubrication.

Keep checking the plug for colour & in particular, if it seems too hot.

If the engine appears to be getting too hot & you can pull over, leave the engine running @ a fast idle to cool, rather than switch off.

Do not add more oil as that weakens the fuel/air mix.

I hope that helps

[TROJAN6]

Thanks for the reply...Appreciated

[CHRIS in MARGATE]

WT is so right.
If anybody tells you to ride it everywhere at 30mph for 1000 miles refer them back here.
Imperative to keep a fuel charge coming through to lubricate and cool.
Imagine trying to ride a mountain bike in top gear all the time.... you can feel the strain in your leg muscles. Exactly the same for your engine. Change down.

[sunrisemac]

Good advice being given, it's always best to not let any fresh bits labour.