Tuesday, 15 November 2011

Lights, carbs and turning off a tractor

Noticed the rear brake lights weren't working correctly. When sidelights are on if you pressed the brake the off side rear lights went completely off. If full lights were on the off side would be duller than the near side but would at least be on. After a bit of trawling on the internet it seemed earth wiring problems are the source of all things lighting. Had a quick look at the bulb holder and removed the black earth cable gave the connection on the holder a quick clean and put it back on. No more lighting problems.

After changing the carb dashpots I decided to try to increase the richness of the mixture (the only reason for this is when I press the lifting pin the RPM goes down). However after turning about 8 flats down on the jet adjuster nut the RPM still went down but the engine was running worse so I wound it back to where it was and left it. Maybe I need to remove the air filter for this to work but the car runs okay in the main. The reason for messing with it is that my idle is currently about 600 RPM which is quite low but if I increase this even to 700 RPM I get over run (dieseling) when I turn the ignition off and the more RPM the worse it seems to get like I'm in an old tractor rather than a sports car. I have read that lean carbs can be a cause of dieseling but I'm not sure if thats correct so I thought I would give it a go. The carbs I believe aren't quite right at the moment as on start up from cold the choke pulled out about 1.5cm makes it start to judder a bit so I have to push it in slightly but if you go too far it nearly stalls so it just goes put, put, put for a while and when I get the choke in the car idles nicely but it takes about 5 minutes in total. From cold I don't think it would make a very good get away car. I am sure I will come back to this at a later date.

That reminds me the rev counter has started to work again. I don't really get what's going on as its a mechanical gauge so if the cable breaks then surely thats the end of it working and if the gauge seizes and the cable breaks then its the same result. How come it keeps coming back to life?

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