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Sparkplug issue
Sparkplug issue
i m having problems with spark plugs on my R51/2
When I took the bike for the first time Bosch W5AC were mounted. Then the one on the left cylinder, when i was running suddenly failed
I discovered that the original sparkplugs use for my bike were Bosch W240T1 / W4AC
So I bought a couple of NGK B8HS, which I understood are the equivalents to the overmentioned Bosch
Yesterday evening again, one cylinder suddenly failed. I assume that the sparkplug on that cylinder doesn t work properly anymore. Now i left the bike in a garage of my friend, as soon as i can i will go to check if the problem is the sparkplug again
I think no more than 200 km run so far with the new NGK sparkplugs and for 2 times i had issues with the one mounted on the left. What are the possible causes and what i must check?
- carburetion? even if the engine runs smooth i noticed that it s rich, maybe richer on the left. Some oil infiltration in the left cylinder can cause the breakage of sparkplug?
- gap of sparkplug? i never checked
- sparkplug heat range? i choose the equivalent to the original bosch but maybe it's not the right one for the actual condition of my engine?
thx for helping also on this problem
- schrader7032
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- Location: San Antonio, TX
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Re: Sparkplug issue
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Re: Sparkplug issue
Left just replaced this morning with a new one. I confirm that the problem yesterday was the sparkplug of the left cylinder. This picture is how it appears after a ride of 20 km more or less.
- schrader7032
- Posts: 9086
- Joined: Fri Oct 27, 2006 3:00 am
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Re: Sparkplug issue
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Re: Sparkplug issue
Is there any way to contain and survive untill i do the replacement?
- schrader7032
- Posts: 9086
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
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Re: Sparkplug issue
You could experiment with hotter plugs...I think they tend to burn some of that stuff off.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- skyler.robbins
- Posts: 228
- Joined: Sat Sep 22, 2018 4:14 pm
Re: Sparkplug issue
Also.. I agree with an earlier comment on compression test.
Re: Sparkplug issue
I never did personally the compression test, the leak down test neither. I will look for the devices to check both.
On the side of the broken sparkplug , the airmix screw of the carburator is visible much more out than the other, nevertheless it does not seems to make the sparkplug more clean
I checked the valves gap and set both at the upper limit spec (0.15 mm intake, 0,2mm output).
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Re: Sparkplug issue
R69S - R60/2 - R67/2 - R51/3 - R69