Originally Posted by motolab
The need to leave the cold start enrichment (technically BST40 carbs do not have chokes) active longer points to a lean problem. It sounds like the pilot jet may be getting some deposits in it.
So, will this enzyme additive work its way out after a couple tanks or do I need to drain the fuel? I added it to one tank. I've refueled only once so far but did not add any more startron. It is still not running well in first gear or on start up.