Hi Frans
"At a cold start, the engine appears to run on two
cylinders for a while (confirmed by the EGT: only cylinders 2 and 4
produce heat). Any ideas appreciated!"
I agree with Bob,
check very careful the enriching circuit passage on the bottom of the
float bowl. I have a BMW R-100GS with type 64 carbsand these are the
first things to get "carb snot" when it sits for a while. Not
the easiest thing to clean, you have to go out of your way to make sure
they are completly free. BTW best replace the float bowl gasket, if they
leak on a 914 you can leak out airbox pressure faster than it can come in,
hence run out of fuelor at least lean when you boost.
The
carbs are a pain to take off on the R100GS. If out on a trip if you
discover that engine won't start because it got colder than normal in the
morning, it isn't easy to hand choke. Blowing into the float bowl vent
"primes" enough to get started. The 914 is a little harder to
get to vent but if you were stuck somewhere and couldn't or didn't want to
disassemble carbs could probably get you going if enrichment circuit
failed. Best have a fire extinguisher handy if you do so.
Good
Luck
Ron Parigoris
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