Some suggestions:
1. Is there oil in the dashpot?
2. Wrong oil in the dashpot (use light oil)
3. Fuel/air mixture too lean (wrong carb needle?) - as you mentioned
4. Over-advanced timing
JLC
Eddei wrote:
Looking for some help with an annoying problem.
The patient:
1971 Midget 1275, 30 over, Kent 256 cam, hi flow oil and water pumps.
1967 spec SUs (crankcase vents though PCV into manifold rather than
directly to carbs as on a stock '71 setup).
The problem:
Stumbles badly starting out from a standstill. Worse when cold, but
problem exists when at operating temp. Stop at a light or such, hit the
gas to start out and it stumbles, nearly dying at times. Have to really
nurse it to get going. Starts easily, even in cold weather. Runs strong
and smooth once it gets moving. Idles fine.
Any ideas? The carb mix seems OK just reading the plugs, but the problem
seems carb related. First thought is that maybe with the bored out
cylinders the needles might be to lean just off idle? Ignition
components are pretty new - cap, wires, points, condensor, coil all
within 2000 miles or less.
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.300 / Virus Database: 266.5.0 - Release Date: 2/25/2005
|