I am battling to get the SU's to run properly on my 89 V8 110. Symptom: Runs fine when cold, when warm starts jerking, feels like fuel starvation. When I tap off, she runs properly. Foot down, jerks again. Started after a long 8 hour run flat out (my normal driving style).
I have done the following:
- Replaced all seals on carbs, including both sides of throttle butterfly shaft;
- Replaced fuel pump;
- New fuel filter;
- Blocked off PCV pipes on carbs & routed crankcase breathers into catch can - made a huge improvement;
- Turned idle mixture screws 3,5 turns rich after ensuring that main jet is level with bridge;
- Balanced carb airflow equally;
- Made sure fuel pickups in float chambers are facing inwards;
- Checked float levels;
- Cleaned out carbs thorughly;
- Checked height of needles - collars level with body of piston.
All of the above have improved matters greatly, but still jerking. It feels as if it leans out when warm - what about the bi-metal thingys that hold the jet in place?
Cheers,
Japspeed.
