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PostPosted: Sat Mar 28, 2020 11:31 am 
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Joined: Fri Dec 20, 2013 7:13 pm
Posts: 65
Have you changed spark plugs to suit unleaded petrol? The original NGK plugs are bp6hs. I found they carboned up particularly when idling and starting out with back firing . After trying bp5hs it still was a problem but further advice tried bp4hs which cured the problem. I understand the Champion version is RN14YC. Hope this helps anyone having similar problems and if others have had good results you might like to make suggestions.


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PostPosted: Wed May 13, 2020 10:31 am 
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Joined: Sun Jul 16, 2017 5:21 pm
Posts: 14
Hi Rusty I think you are correct ,I found a article on 4secondsflat.com spark/ which shows how to read a spark plug ,I have set the carbys and timing up with bp6hs,but get a indication of a plug not hot enough plug color is nearly right will try bp4 for a while see how it goes cheers


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PostPosted: Tue May 26, 2020 11:39 am 
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Joined: Thu Mar 17, 2016 11:35 am
Posts: 28
Thats very interesting! I run with the bp6hs and the car runs fine except for a tendency to try to stall when I come to a stop.
However after a cold start if I dont get full choke off straight away the plugs foul up so badly it hardly runs.
I'll try the bp4hs!


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PostPosted: Tue May 26, 2020 12:59 pm 
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Joined: Sun Jul 16, 2017 5:21 pm
Posts: 14
I had a problem would not start when hot and ran very rough when started the choke was sticking I replaced the return springs with old set that I had solved that problem , with the hotter plugs runs very well starts easy any time I am trying to adjust to the higher octane 91 instead of 80 nearly there cheers


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