3 replies to this topic

[Zik]

Hi all, been having some trouble with a spot of rough running today. Car is an 87 Mayfair and the engine is pretty much standard with an hs2 carb.

The engine idles fine on start up, but after a couple of minutes driving if I depress the clutch, the revs will fall down and not be caught by the idle, and drop to 0. The engine also starts struggling if I decelerate with it in gear, if I'm pulling up to traffic lights the engine starts feeling very laboured below 2k rpm and I can feel the engine slowing the car dramatically. I've checked and the spark plugs are a good tan colour and tve gaps are correct. I gave the dizzy a wipe inside, a spray of wd40 and another wipe, but the 4 points look quite marked and a little past their best. I'm assuming this is an ignition problem not fueling as the engine runs fine above 2k or so rpm.

Colour me confused!

[jaydee]

An 87 mayfair will have an HS4 carb.

Looks like you have some breather disconnected, like engine breather to the carb.

[Zik]

The carb has the diagonal bolt pattern of an hs2, according to the HBOL, only 2 mounting bolts. You know that might be spot on as the tapper cover breather hose is split quite badly at one end. I'll give replacing it a shot

[Zik]

Apologies, Google has just informed me I do have an hs4, Haines lied to me!