The ability to post messages is restricted to LCGB members. Any questions contact us at lcgbadmin@googlemail.com
Warkton Tornado No.1 wrote:An exhaust as per OEM will be contributing to back pressure, so leakage should be more obvious, as you have discovered.
Any leak is not good, but just those depicted are unlikely to cause significant weakness.
I would pursue the problem. You say that a full leak down check has been made, but the two you found easily might be masking others, not so obvious.
I would remove the 'U' pipe in any case to visually check for leakage & test for leaks again.
MickYork wrote:The exhaust may be a problem but i'd be more inclined to check the carb'. The choke is merely adding more fuel so a blocked or pilot jet may be the cause or you may require a slightly larger jet.
rossclark wrote:Cover the gasket face of the u-bend with with pen or paint and flat it off with a file or on a sheet of sandpaper on a flat surface.
Copper silicon sealant and a decent solid gasket - annealed copper - should ensure that joint. You should have the u-bend on if you have a fixed flange when you do a leak down test.
With that joint sealed look for leaks around the sparkplug, head, inlet manifold, cylinder base, mag flange. Spray soapy water and watch for bubbles. It will loose some pressure over time but of it holds for 20-30 mins I'd call that OK.
Danbretta wrote:I tried a copper solid gasket today and there is a leak at the back. The face of the manifold is flat as I sorted that today, maybe its the face of the cylinder or the copper gasket needs flatting off. I'll use the copper gasket sealer and look for more leaks.
Users browsing this forum: No registered users and 49 guests