Leaking inlet valve?

[Kurf]

Is there a way to check if valves are ok without removing the head?

Compression test on my 1127 was ok but I think there might be something wrong with a valve at cylinder two ; at cold engine it sounds and feels like a pulse of “air” is forced back towards carbs. 

[Captain Chaos]

put piston 2 in TDC with valves closed, lock the crankshaft somehow (in 1st gear with locked rear wheel for example), blow air in cilinder through spark plug hole. You can now hear leaking valves through the carbs or exhaust.

[Kurf]

Thanks Capt. Chaos.

Will try that tomorrow

[dupersunc]

1 hour ago, Kurf said:

Is there a way to check if valves are ok without removing the head?

Compression test on my 1127 was ok but I think there might be something wrong with a valve at cylinder two ; at cold engine it sounds and feels like a pulse of “air” is forced back towards carbs. 

Sounds like out of balance carbs. But try a leak down test as suggested to be sure.

[Kurf]

30 minutes ago, dupersunc said:

Sounds like out of balance carbs. But try a leak down test as suggested to be sure.

Thanks again. 

Also a good tip which I will defenitely follow

[Captain Chaos]

adjust the valve clearances before balancing the carbs

[Kurf]

Made something out of a sparkplug to put air pressure in the cylinder..

 

[nlovien]

good thinking  - if you do it again but weld a stub onto the other side and fit this to one of the opposing pistons (1 or 3 ) you can use this to "lock" the engine when you pump it up