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Old 16-05-2020, 06:59 AM   #1
martin.2010
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Default misfire and cut out when trying to rev the engine?

Hello
I'm having issues with my 71 1200 bug.
It start a small misfire at idle a week ago. I had just changed the fuel pump (because old was leaking ) change the oil and now I have big misfire, unable to get the engine to idle and would cut out when trying to rev the engine.

I have so far:
Recheck fuel pump, valve clearances and timing
Check the compression 120 to 110 psi
Cleaned and regaped the spark plugs also different coil and condenser, I checked the points too
I strip, cleaned and add new diaphragms to the carb and double check accelerator pump working

Still the same the problem
I thinking of trying new HT leads, spark plugs and points also

Sorry for long thread but I am running out ideas
Thanks
Martin
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Quote:
Originally Posted by paulatxntric View Post
...speed don't kill.....hitting things at speed kills and thats usually because people are driving like twats.....unfortunatly "twat cams" don't exist!
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Old 16-05-2020, 03:10 PM   #2
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Have you set the ignition timing since the points change ?


When you re-checked the valve clearances, did any of them need a lot of adjustment (more than 1 turn of the screw ?)


Pull all four plugs and compare colours, see if they indicate too rich, too lean or a problem with one or two cylinders in particular.


Remember, just because a part is new does not mean it is not faulty. Consider re-fitting old parts to help locate fault if required. Bosch made in india plugs have had a bit of a bad rep...



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Old 23-05-2020, 12:44 AM   #3
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Thank for your reply

Quote:
Originally Posted by Mr.Whippy View Post
Bosch made in india plugs have had a bit of a bad rep...

Dave.
It was the plugs, these one are Bosch made in Russia.


Thanks
Martin
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Quote:
Originally Posted by paulatxntric View Post
...speed don't kill.....hitting things at speed kills and thats usually because people are driving like twats.....unfortunatly "twat cams" don't exist!
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Old 23-05-2020, 05:56 PM   #4
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Result !


Thanks for letting us know the fix.



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Old 25-05-2020, 11:45 AM   #5
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Really wow. Sounded like points.
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Old 25-05-2020, 11:45 AM   #6
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Really??
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