mbullyb Posted February 8, 2016 Report Share Posted February 8, 2016 Hi I have a 1977 Spitfire 1500 Ive just rebuilt my carbs, new jets, needles, valves, gaskets. They have both been reset (jet adjusting screw 2 turns anti clockwise and idle screw 2.5 turns clockwise), ready for tuning. Trouble is i cant get the engine to start, it turns over and i can confirm a spark at each plug. Any idea's? Thanks Mark Link to comment Share on other sites More sharing options...
Andrew Posted February 8, 2016 Report Share Posted February 8, 2016 Hi mark There are only two things stopping an engine firing up 1 no spark 2 no fuel As you say there is a spark so it must be lack of fuel, disconnect the fuel pipe at the carb to see if fuel flows. If not that is your problem if there is fuel the car should start even if it runs rough. The starting point for your carbs jet should be level with the bridge then two full turns full anti clockwise then refer to the carb setting instructions in your manual. Give me a message if this help get you going Regards Andrew Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 9, 2016 Report Share Posted February 9, 2016 Disturbing fuel pipes often ends up with slivers of rubber cut off when fitting the metal tubes, these float about and block the back of the float needle whip the carb tops off , is the level the same in both anything else youve touched like Ht leads and firing order pete Link to comment Share on other sites More sharing options...
mbullyb Posted February 9, 2016 Author Report Share Posted February 9, 2016 Thanks for the responses, Theres fuel flowing into both carbs and i have the correct adjustments set. havent tried checking for slivers of rubber yet so i'll try that at the weekend, i'll double check my leads as well, i did try a strobe on all the leads and it was lighting up fine when the engine was turning over Cheers Mark Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 9, 2016 Report Share Posted February 9, 2016 Was it running ok before you rebuilt the carbs, Have you moved any of the HT leads and maybe not got them back in the right place when you pull the choke do both jets under the carb actually drop fully The cold weather definitly needs a rich or choked mixture to fire up pete Link to comment Share on other sites More sharing options...
dougbgt6 Posted February 9, 2016 Report Share Posted February 9, 2016 I would turn the engine over, take out a plug and check if it's wet with fuel. If it is, well, the carbs and the vacuum are working. If it's dry check the manifold gasket for leaks and double double check the carb gaskets. I've had spark and fuel and no start due to leaking manifold gasket. Also another time I put the carb gaskets in the wrong way round A spray can of "easy start" is useful, A shot through each carb and if you have spark and compression the engine will start, briefly. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now