Speaking of carbs, I have thought about switching to SU's to try and cure a starting problem I have.
When I start my 2500M from cold, it starts right up. When it's up to temperature and I shut it off and wait about 5 minutes or so it is very hard to start and requires a lot of cranking to get it going. If it sits long enough (30-40 minutes) it starts right up. Once started, runs strong and smooth.
Determined that fuel seems to dribble out of the main jets after switching off and puddles by the butterfly, thus, I believe causing a slightly flooded situation when warm. I've tried:
- Carefully adjusting the float levels
- Carefully adjusting the temperature compensator valves
- Pinched off fuel line after shutting down to make sure it's not residual fuel pressure
- Installed aftermarket heat shield with additional heat shield material added
- Completely replaced carbs with a set of non-emission 175CD's that I bought at a flea market and throughly rebuilt (carefully adjusting float level) - absolutely no difference.
- Replaced coil (just to make sure it's not the coil getting too hot)
- Replaced plugs, wires, cap, cond. etc.
- Obviously, adjusted valves, timing, the usual stuff.
Has anyone else ever experienced this?
Incidentally, I understand the float bowls on SU's sit at a slightly incorrect angle when used on the TR-6 engine to permit smooth functioning of the float and must be modified slightly or a set of SU's from a certain Triumph sedan used. Anyone have experience with this?
'73 2500M