Rebuilt engine in and running - need help with the tuning

[Ozdunc]

Morning chaps,

Got the engine running over the weekend, it idles OK but its down on power under load. So much so that you really need to rev it to stop it stalling as you lift the clutch. It seems to drive along ok under steady revs but put your foot down to accelerate it seems to bog down, hesitate and then accelerate.

It's a 8:1 compression engine running new NGK BR5ES plugs set at 0.8mm, plugs look good, distributor is electronic set at 6BTDC. Leads are new - brand I think is FML, coil is old but was working fine (ECHLIN 80).
Fuel pump is new (and primed really quickly), as is the filter (fuel has been in the tank about 3months).
Carb is new and s a Zenith 361V, air filter is stock oil bath. Idle is probably higher than 500, maybe 6-700 hard to tell but it seems higher than the old idle.
I've adjusted the low volume screw to give what I think feels/sounds like the smoothest running, but it does seem to resonate though the car at times (although that could be due to the exhaust being hard up against the gearbox mount atm). The low volume screw doesn't seem to be that sensitive, I seem to have to turn it a fair bit (1-2 turns) to notice any difference, and if anything I'd think I'm more likely to be running rich than lean on idle.

Can someone give me an idea of where to be looking to sort this problem out.
I have the old carb, and everything else to swap in and out for trouble shooting but would appreciate a nudge in the right direction.

I think once I get this sorted its going to be awesome!!!

Cheers

[Ozdunc]

Just realised I should have put this in the Series forum.

Sorry.

[Tank]

You said the timing is set at 6 BTDC, how did you achieve this it would be hard to do if you can't get it to idle, also you need the dissy vac hose diconnected and blocked off at the source, regards Frank.

[Blknight.aus]

accelerator pump and linkage adjustment

[Ozdunc]

Frank: it idles fine. I set the timing with a timing light but the vac advance tube was connected.
Dave: how do I change the accelerator pump and linkage on a Zenith? It's brand new, will I need to strip the carb?

[Blknight.aus]

thats the sort of question that indicates that its something you probably dont want to mess with...

My Zenith is driving me to take up zymurgy

that link leads you jpegs of the docs for it

[vnx205]

Are you sure the timing isn't one tooth retarded?

In that situation, it tends to start easily and idle well, but have no power.

[Ozdunc]

Thanks Dave,

You're right I'd rather not have to take the carb apart if I don't have to. I have the green bible if necessary.
In that link they mention a fix with a o ring on a port but the link takes you to a Dutch website advertising Ukrainian ladies!
Any idea what the fix was, or which port was affected?

Cheers

[ian4002000]

Wheres the link ? I like Ukranian ladies ...

[Blknight.aus]

the linked page should have the pages from the green bible.

Land Rover FAQ - Repair & Maintenance - Series - Engine - Zenith Fix

is the link that works to a good set of instructions on lapping the housings.