Knocking slapping

[Roxylass]

Started the engine today sr2 to see if there was good voltage in the battery 

plenty power to fire her up 

noticed just above idling a knocking or slapping coming from cyl no 2

gave it some revs could still hear it no excess smoke coming from the exhaust 

checked the mountings engine firmly bolted down checked oil reading top mark on the dipstick 

all information greatfully appreciated 

[bizzard]

2 hours ago, Roxylass said:

Started the engine today sr2 to see if there was good voltage in the battery 

plenty power to fire her up 

noticed just above idling a knocking or slapping coming from cyl no 2

gave it some revs could still hear it no excess smoke coming from the exhaust 

checked the mountings engine firmly bolted down checked oil reading top mark on the dipstick 

all information greatfully appreciated 

Use a listening stick to pin point the noise, a long old screwdriver.   Could possibly be the de compressor lever adjuster come loose inside the valve cover.

[BWM]

It may just be some air entering one of the injectors. 

[john.k]

I would lift the rocker cover and be sure you havent got a sticky valve,broken spring,or a loose adjuster.......Running with the cover off will also get you closer to the noise.

[RLWP]

If you remove the bit of wire linking the two decompressors, you can then operate them separately. With the engine running, operate them one at a time and see what happens

 

If all is well, the engine revs will drop on each cylinder by roughly the same amount

 

If one cylinder isn't running, operating the decompressor on the other cylinder will stop the engine

 

CAVEAT!

 

Diagnosis by forum is very nearly impossible. 

 

Richard

[john.k]

Maybe the broken bungee cord has lost its tension.

[Roxylass]

No no good bungee cord stops the raised hand start from turning 

while engine running so no rattle from the chain 

i will try and do a video tomorrow of me starting the engine 

and operating the compression levers one at a time 

I will do m☹️y best 

[Roxylass]

Tried my best 

Won’t let me upload video it’s a good one too