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Cold Weather hard starting and spark plug on B112


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#1 steve b OFFLINE  

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Posted November 03, 2015 - 01:00 PM

So the B112 is very hard to start when it is much below 50. It runs great once it finally starts. It also starts instantly in warm weather. I got to wondering about the condition of the plug. What I took out was a Champion LM 19. I was under the impression that it was supposed to have a Champion RJ8C. I replaced it with the hotter RJ12C. So, could the LM 19 cause the hard starting? I notice that the plug is a bit longer than the LM19. Is the RJ12C fine to run in this? It did seem to start much easier with this plug, though it really is not that cold here.

Thanks



#2 jabelman ONLINE  

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Posted November 03, 2015 - 01:13 PM

what oil are you using?

#3 637Yeoman OFFLINE  

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Posted November 03, 2015 - 01:30 PM

be careful with different lengths of plugs because it could hit the valves! 

I know on my engines it can only use a Champion cj8 because it it the only one short enough to clear the valves 



#4 boyscout862 OFFLINE  

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Posted November 03, 2015 - 02:39 PM

When any of my ACs(anything with the old cast iron Briggs) are hard starting, I know its usually going to be related to the carb. Good Luck, Rick



#5 steve b OFFLINE  

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Posted November 03, 2015 - 03:30 PM

Thanks all for the replies so far. I am using 10w 30 in the winter.  The RJ12C plug is the same length as the RJ8C, just a hotter electrode. ( or so I am told )



#6 637Yeoman OFFLINE  

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Posted November 03, 2015 - 08:35 PM

Thanks all for the replies so far. I am using 10w 30 in the winter.  The RJ12C plug is the same length as the RJ8C, just a hotter electrode. ( or so I am told )

i would just use 5w 20 and clean the carb. thats what i did with mine and it starts easily



#7 MH81 ONLINE  

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Posted November 04, 2015 - 07:07 AM

If for some reason the above suggestions don't help, try timing and condenser.

#8 steve b OFFLINE  

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Posted November 06, 2015 - 07:58 PM

Thanks folks.

I will see how it goes once our Indian Summer leaves ( in New York ). We have had the windows open for the last severel days! I was hoping for some sage advise on the different spark plug types someone on here must be an expert.






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