LCGB Forums

This is a new piston to replace the one I blew a hole in during Euro lambretta rally, due to running too lean. http://scooterotica.org/forum/viewtopic.php?f=7&t=37142

I'm OK with knowing how to run in a re-built engine, but what are the recommendations for new piston and rings. See below for a bit more info.

Anyway, stripped top end down, (barrel OK) cleaned out crankcase and put in new A TS1 piston from AF Rayspeed. Piston bore clearance and ring gap OK. This has a new TMX35 carb and I have put in stock carb settings from my original build and 2010 Dyno after I ran in this engine. So the carb settings are now

main jet as at the 2010 dyno - 340
I have changed the needle from the eurorally from a 56 needle P2 down to the 2010 dyno of 55P2
Idle was 22.5 on eurorally, but after my first run to work this morning, I feel that the 20 idle from the 2010 dyno may take out the spluttering up to almost 1/4 throttle.
Will do plug chops before going any further.


Thanks

Paul

Some people wouldn't bother running it in at all but I'd be inclined to take it relatively easy for the first 50 - 100 miles or so. As for jetting, you can't be too far from a dyno.

What was the reason for the blowing the hole in the piston though, have you resolved it?

old skool!!! 500 miles every day then frash it after your plug chops

Twice round the block, then ride it like you stole it