mishmosh Posted November 25, 2015 Report Share Posted November 25, 2015 I have a Mk4 1300 with a simonbbc ignition. standard twin 1 1/4 su carbs. Until I recently, it was an excellent starter , taking a quick spin of the starter and little choke. Now it needs a full battery a good few spins and full choke. I have changed the Plugs, checked the leads, checked the jets are seating. Now I did have it tuned at Donington but it didnt need much really. ideas? Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 25, 2015 Report Share Posted November 25, 2015 Think I would check the feeds from the ign switch to coil are live when you are cranking it up is this would have been a ballasted coil,?. Did you give the simon unit a 12v feed ?? as cold weather drops battery volts and ups the stater load , it could be with a ballast lower voltage than it likes pete Link to comment Share on other sites More sharing options...
mishmosh Posted November 25, 2015 Author Report Share Posted November 25, 2015 Thanks, Ikinda knew you would be first in Pete ! I ts in the herald, so no ballast. whats the best way to test the feeds Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 26, 2015 Report Share Posted November 26, 2015 a cheap meter i guess, so no ballast that eliminates any old balls going on , this may be a death nell of the simon unit , some love em some hate em ! Ive come across a couple of duff ones in my years but never fitted any if you pull a plug lead do you get a good spark jump to earth whos rotor , black with a rivet or red one ?? Pete Link to comment Share on other sites More sharing options...
mishmosh Posted November 26, 2015 Author Report Share Posted November 26, 2015 rotor is standard BBC. good clean spark. I am starting to think its time to do a compression test. Yrs ago when I first bought it, It had a sticky valve. The AA would regularly towstart me. It fired instantly then. I am on a leaded head and have done over 40k on it. Maybe, its time..... Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 26, 2015 Report Share Posted November 26, 2015 Make sure the jets do drop fully when pulling choke, and chsck there is no green stuff in any of the HT connectors especialy the coil Cold weather needs more choke , can you hand prime the pump, before cranking ? pete Link to comment Share on other sites More sharing options...
mishmosh Posted November 26, 2015 Author Report Share Posted November 26, 2015 I think hand prime is the next test. back to the coil test. can you explain how please . I have a meter. Link to comment Share on other sites More sharing options...
JohnD Posted November 27, 2015 Report Share Posted November 27, 2015 Quick crude test - spray KwikStart into the inlet. A brief start and die indicates a fuelling problem, no start an ignition one. That could exclude extending the enquiry to the fuel pump. 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