8 replies to this topic

[tamlamotown123]

Hi any suggestions on my issue?

1293 twin Su's new 23D dizzi,new plugs/leads,new loom,orig alternator and coil. has run ok for about 500 miles.

Problem is running on 3 cyls most of the time but will occasionally run on 4 for 20/30 secs, av tried removing each plug lead

one at a time but makes  no difference.plugs are gaps are ok, alternator is charging, dashpots are free to move.

 

 

[DeadSquare]

Clean the original dizzi,  put it on a radiator to dry for a day, check the cap for cracks or buy a new one, fit it, time it, spray it with WD40 and see if there is any difference.

[slidehammer]

Might be worth compression testing the engine, check the compression is fairly even across the cylinders and checking that the tappets are set properly and not holding a valve open.

[MiniMadRacer]

Have a good look at the Rotor arm, and the 4 contacts it "touches" inside the dizzy cap. Pattern rotor arms are notoriously sh.... and I have "eaten" a few in about 500 miles

[floormanager]

I had a recent experience of an engine only running on two cylinders. Convinced the new head gasket had blown, compression test ruled that out.. New distrubutor and components.  All new on the HT side. Changed to twin carbs, rebuilt the original HIF44, still would not run. Changed the condenser and off it went!!  I could not believe it.

[sonscar]

I had similar symptoms with a leaking inlet gasket,Steve..

[Tones61]

Poss wear in dizzy shaft,sometimes not opening points on due to play in shaft

Edited by Tones61, 05 January 2020 - 01:17 PM.

[tamlamotown123]

Hi thanks for everyone who replied to my post, some useful ideas and solutions for me to work through, just waiting for a warmer dry day to try them out best regards to all

[Tones61]

any news on this mate