Valves on my Bra CV3

[DaveWard]

Hi Guys thanks for you reply's re Oil Temperature / cooling / gauge etc. I have had to put that on hold at the moment as I now have a more pressing problem.

Driving along the other day it started to stutter and power dropped considerably. I got it home ...just !
It runs ok in the garage if I keep the revs up but won't idle and back fires some-what into the carb. Spark plugs and ignition seem fine . The inlet and exhaust valve gaps were a bit tight ! Adjusted but no better. I I got a compression tester on the off side head ( 130/140 psi ) but there is steel work obstructing my access to the other head. However I brazed a connection into an old spark-plug to get access ...... showing an iffy 40 psi.
I'm reluctant to take the head off but this sounds like a burnt out valve to me.
Any thought or suggestions would be most welcome
Thanks
Dave Ward

[billp]

Hi Dave, I'd give the carb a good clean out first. Use an air line to blow through the jets(preferably backwards in order to dislodge any particles). In the past I have found mine with all sorts of debris and water in it when having the same problem as you. Then fit an inline fuel filter.
Bill

[Davidm]

Dave
What compression do you measure on the offside using the same brazed spark plug connector method you used on the nearside ?
Davidm

[DaveWard]

Thanks both, I've now managed to get a better reading from both cylinders .
Going to try getting an airline onto the cylinders as suggested and if results are good will then move onto the carb

Thanks ]

Dave

[notsmartcar]

Don’t suppose your running on points are you,,, is the coil hot to the touch when it starts to misbehave.