[Yougos]

Thanks for taking time to read this.

My 1965 Series 2A is running very rough. It also looses a small bit of power under load. It seems to have a big flat spot when I put my foot on the throttle put appears to run ok at higher revs.

This have started when I had it parked up for about 4 weeks.

I have already done the following:

Tried 2 different coils
New spark plugs and leads
New distributor (Including points and condenser)
New Carburetor kit (Zenith) as well as tried a carburetor from another LR
New manifold gasket
Adjusted valve clearances
Clean fuel filter bowl (Manual fuel pump)
Adjusted the timing
Tune carburetor with a color tune tool (Can't quite get bunsen blue color 100%)
Replaced fuel in tank
Yelled at it "Run stead ya bastard"
Never ever swore at it.

Any ideas will be greatly appreciated Thanks!

 

[antichrist]

Which cylinder is low on/loosing power, or is it random?

 

[roverandom]

What are you using as fuel? Have you had the heads modified for unleaded petrol? You could have a burned valve/worn valve seat. I.ve seen that cause the symptoms you are describing before.

 

[Yougos]

I am using 91 fuel + additive.

Did a compression test tonight, Results : 80 ,0 , 0 77.5 dry and 87.5, 0, 0, 85 wet.

I plan to take the head of in next few days. Sounds like valves not seating?

 

[antichrist]

Zero compression on a cylinder would certainly cause rough running.
If it started suddenly after sitting it's probably stuck valves.