1972 HC 1256 skipping uneven
Posted: Wed Apr 22, 2020 11:25 pm
Hello All,
I'm seeking any advice on my engine running uneven. I have been trying to solve this problem for a long time
When its running it's like a it's missing a heart beat. The engine kicks like it's missing but it's not. The power is there.
Things I have done to find this problem:-
Changed plug leads
New spark plugs
New coil.
Refurbished the carb . Fuel pump and petrol tank.
Reset the tappits
Check the compression which ranges from front to back in PSI 105 , 105 , 107, 109 . Which is low end for 1256 hc.
The thing I have noticed when I took the plugs out to do the compression test is number 1 and 4 cylinder plugs were basically black, the other 2 middle ones looked correct colour.
Apologies for the long explanation but this is driving me crazy (no pun intended)
Any ideas would be very welcome.
Many thanks
I'm seeking any advice on my engine running uneven. I have been trying to solve this problem for a long time
When its running it's like a it's missing a heart beat. The engine kicks like it's missing but it's not. The power is there.
Things I have done to find this problem:-
Changed plug leads
New spark plugs
New coil.
Refurbished the carb . Fuel pump and petrol tank.
Reset the tappits
Check the compression which ranges from front to back in PSI 105 , 105 , 107, 109 . Which is low end for 1256 hc.
The thing I have noticed when I took the plugs out to do the compression test is number 1 and 4 cylinder plugs were basically black, the other 2 middle ones looked correct colour.
Apologies for the long explanation but this is driving me crazy (no pun intended)
Any ideas would be very welcome.
Many thanks