One of my 1978 Peugeots has an annoying problem that has developed recently where it runs like crap for the first minute or so after it starts. It starts without any difficulty, but then stumbles and misses for several blocks, not developing any real speed. The problem will gradually get better as the engine warms up, and after about two minutes it runs like a champ.
I'm concerned about this problem for two reasons:
1) It might be a symptom of something severe happening inside the engine because it never did this before, and
2) I feel like a total <i>shmuck</i> putting along at about 10km/h (6 mph) down the first couple of blocks on a moped that sounds like it has been shot down.
a new plug (NGK BPR6HS),
cleaning the carb,
replacing the fuel,
decarbonizing the engine.
good compression (110 psi),
good timing (when it warms up it runs fantastically well),
fuel mix of 45:1 (OEM recommends 50:1),
Can anyone out there think of any "gotchas" I'm missing?