Moped Riga Mini dies after 4 km

One year ago I've bought a 1989 Riga Mini moped with overhauled engine. It's 2-stroke 50 shifty with electronic ignition. Engine model is V501M, produced in Latvia.

The moped starts and runs great, but after apprx. 4 km it runs weaker and weaker and then refuses to start or run.

Next day everything is the same: starts great but after 4 km dies.

What can this be? There is a spark, the fuel gets in, the spark plug is not fouled.

Re: Moped Riga Mini dies after 4 km

If it has good spark immediately after it quits running , I'd look for a clogged fuel system . Maybe the in tank filter or the petcock clogging ???

Re: Moped Riga Mini dies after 4 km

^or vent in gas cap

Re: Moped Riga Mini dies after 4 km

You said the next day it runs great but what about just letting it fully cool down first and trying it an hour or two later?

Could be the rings.

Re: Moped Riga Mini dies after 4 km

> ..... poop Wrote:

> -------------------------------------------------------

> You said the next day it runs great but what about just letting it fully

> cool down first and trying it an hour or two later?

>

> Could be the rings.

In one hour after cooling down it runs about 1 km and then dies.

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