It's definitely a spark timing problem if it is backfiring through the
carb(s).
Cheers!!
Jim
On Tue, Jul 15, 2014 at 5:07 PM, bmwwxman . <bmwwxman@gmail.com> wrote:
> What Mike said..... I've seen this happen before too. On my MKIII
> Midget I have to rotate the dizzy 180 degrees from where it *should* be.
> You could try that too. I've known a number of different 4 bangers where
> the dizzy was 180 degrees out.
>
> Cheers!!
> Jim
>
>
> On Tue, Jul 15, 2014 at 4:07 PM, Mike Rambour <lists@dinospider.com>
> wrote:
>
>> 40 years ago when I was a stupid teenager who knew it all, I spent 2
>> days trying to get a engine to fire, it kept spitting back through the
>> carbs and not running. On the second day I was going through everything
>> and checking valve clearances...Following the firing order 1,3,4,2 then
>> my girlfriend said "if 3 comes after 1, why did 4 intake valve open ?" or
>> something like that. 40 years and I still hear about it from her (married
>> 36 years now).
>>
>> Some idiot has put in a new cam that had a different firing order,
>> 1,2,4,3 is what the cam was, I have no idea where that cam came from it
>> was in the boxes with the block and other motor parts when I bought the
>> basket case and I never checked it just assumed it was right. So check
>> your firing order ! take off the valve cover, set motor at TDC and double
>> check valve timing, then rotate motor watching both valves and rotor on
>> distributor (I think you said it was electronic so oops if it is). This
>> will take 5 minutes to do and eliminate a 1,000 possible things wrong and
>> you will now be able to diagnose from a known starting point. And keep
>> your gf away or she might fix it and remind you for decades.
>>
>> I personally can't imagine how a carb could cause backfiring through the
>> carbs unless you forgot to put parts in or like that. So for fire to get to
>> the carb it has to be valve timing is way off or ignition timing is way
>> off. Yeah, I suppose really really bad valve clearances could cause the
>> symptoms you are seeing but that would be the last thing I would check.
>>
>> Mike
>>
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>
>
> --
> Cheers!!
> Jim Johnson
> Sprite-Midget Club USA <http://www.Sprite-MidgetClub.org>
> High Plains Youth Hockey <http://www.highplainsyouthhockey.org>
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>
> *"Tact is the ability to tell someone to go to hell in such a way that
> they look forward to the trip."*
>
> *Winston Churchill*
>
>
--
Cheers!!
Jim Johnson
Sprite-Midget Club USA <http://www.Sprite-MidgetClub.org>
High Plains Youth Hockey <http://www.highplainsyouthhockey.org>
Dodge City Trail of Fame <http://www.DodgeCityTrailofFame.org>
Electronic Journal of Severe Storms Meteorology <http://www.EJSSM.org>
Dodge City 300 <http://www.DodgeCity300.org>
*"Tact is the ability to tell someone to go to hell in such a way that they
look forward to the trip."*
*Winston Churchill*
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