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Mk 2 carbs.

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swede View Drop Down
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    Posted: 16 Sep 2018 at 17:39
During a strip down for a re-furb, I stripped the carbs, and re-built them, with new gasket kits, after cleaning them in a ultra- sonic tank. When the time came round for starting up, it would only tickover half reasonable, if at all,  it would only tick over at all with the mixture screws right in and the throttle stops right in. After starting and stopping a lot of times, the right one improved but still not as it used to be. I re stripped them, looked at them severely and re cleaned them including checking drillings etc. No better; I have checked timing, float levels and every thing else I can think of. I have taken it out on the road, a couple of hundred miles, it is ridable but the idle is still not as it used to be. I have been using petrol with the ethanol taken out but could it be that it did stand around a lot,with ethanol in the petrol before I stripped it? has any one had similar?  I am a mechanic of 59 years and I'm baffled!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote swede Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2018 at 18:03
The topic above 'Mk 2 carbs' is, of course, Ie Mans Mk 2.  Just to clarify!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2018 at 18:51
My LM2 had stood a while before I got it, I rebuilt the carbs as they leaked all over the engine and all the rubber parts had hardened but since that it runs OK.

The only problem I did then get shortly afterwards was sediment (paint/rust etc.) from the tank that stopped it running at higher RPM. When I took the float bowls off they had a considerable amount of crud in them but now cleaned runs fine.

Are the choke plungers working correctly? because I have heard of them sticking, causing the choke to be partly on all the time.
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swede View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote swede Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2018 at 19:04
I think so but I will check on them, just very slightly open would make it rich which would account for the mixture screws but it should then run fast instead of slow and needing the throttle stop screws right in. It is worth looking though, some times you can discount something thinking symptoms don't quite fit and then finding that was the answer!---------Thanks for that.
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