86” 2.0 with Weber 34ICH chronic misfire

AJofShabby · Mar 5, 2021

Hi. My engine had a rebuild after 40+ years in a barn Passed MoT fine. Was returned to me v low on fuel. Didn’t realise quite how low. Started up. Fine on tickover but under load it splutters like crazy. Smell of fuel. No power, can’t get into 3rd/4th. Popping as you drive. Then after a mile or so it ran out of fuel.....anyway, 10 litres added. Plugs cleaned - 1 and 4 were oily black. 2 and 3 relatively clean. Starts but under load it has no power and still pops and bangs up the road. Timing and points checked/reset. Valves checked/reset. There’s an in line fuel filter. Does anyone have any pointers, pls.

Thanks
AJ

Hicap phill · Mar 6, 2021

Check the following
Cap
Leads
Gap in points
Is the filter in the carb clean?
You may have a slightly blocked jet

Colthebrummie · Mar 6, 2021

I'd be talking to the people who did the engine rebuild. Have you put lead free additive in it? Although not doing so wouldn't cause this trouble I just a few miles. Two oily plugs are a bit of a concern, how thorough was the rebuild? Did the put new valve seals in?

Col

Europa486 · Mar 6, 2021

A good dodge on a partially blocked carburettor jet is remove air inlet pipe and start engine
Rev it up at the same time block inlet to carb with your palm, the suction created will often clear
The obstruction,

Hicap phill · Mar 6, 2021

Europa486 said:
A good dodge on a partially blocked carburettor jet is remove air inlet pipe and start engine
Rev it up at the same time block inlet to carb with your palm, the suction created will often clear
The obstruction,

& move hand just before it dies.
(@Europa486 how many time you nearly lost the eyebrows then?)

Europa486 · Mar 6, 2021

Hicap phill said:
& move hand just before it dies.
(@Europa486 how many time you nearly lost the eyebrows then?)

Actually never, occasionally you can get a blowback but never leave your face anywhere near the carb,
50 years in the motor trade and I still have all my bits

so must have done something right,

AJofShabby · Mar 20, 2021

Apologies for forgetting to reply. It was a faulty HT lead. Now sings like a bird! Thanks all.

86” 2.0 with Weber 34ICH chronic misfire

AJofShabby

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Hicap phill

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Colthebrummie

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Europa486

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Hicap phill

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Europa486

Well-Known Member

AJofShabby

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