Hotter plugs on my 800 - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 20 (permalink) Old 06-05-2017, 01:45 AM Thread Starter
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Hotter plugs on my 800

I have a 98 vn800b My rear plug was always running a bit darker than desirable. I read Russian wolfs wright up on switching from the cr7e to the hotter Cr6e he says that lots of people have done this and no one has had any issues, I haven't been able to find any one that can conferm actually doing this just qouting Russian wolf. Is switching both plugs safe for the motor, I don't want to burn up my bikes motor. Has any one made the switch to Cr6e plugs and how has it been.


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post #2 of 20 (permalink) Old 06-06-2017, 01:57 AM
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Hi!
When I bought my bike, I found out that the previous owner did that. But even after that both plugs were in terrible condition. Burned black with wrong gaps and never maintained. I adjusted my valves, cleaned and adjusted my carb, and actually switched back to CR7E. To be honest, I have no problem since that and I see no reason not to follow the original service manual. In my opinion if everything is OK there should not be a big difference what spark plug is being used in a second cylinder. Yes, it's a little bit hotter, but both plugs (CR7E and CR6E) should have no problem with those second cylinder temperatures.
What to say, just test Yourself, what is better for You. You can not burn Your engine anyway: )
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post #3 of 20 (permalink) Old 06-06-2017, 10:12 AM
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What do you mean by "a bit darker"?

Post a picture of both plugs would help.
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post #4 of 20 (permalink) Old 06-06-2017, 03:58 PM Thread Starter
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Quote:
Originally Posted by sfair View Post
What do you mean by "a bit darker"?



Post a picture of both plugs would help.


I don't have a picture right now I could try to grab one later.


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post #5 of 20 (permalink) Old 06-06-2017, 04:01 PM Thread Starter
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Quote:
Originally Posted by tehnis View Post
Hi!

When I bought my bike, I found out that the previous owner did that. But even after that both plugs were in terrible condition. Burned black with wrong gaps and never maintained. I adjusted my valves, cleaned and adjusted my carb, and actually switched back to CR7E. To be honest, I have no problem since that and I see no reason not to follow the original service manual. In my opinion if everything is OK there should not be a big difference what spark plug is being used in a second cylinder. Yes, it's a little bit hotter, but both plugs (CR7E and CR6E) should have no problem with those second cylinder temperatures.

What to say, just test Yourself, what is better for You. You can not burn Your engine anyway: )


I switched both plugs out to the hotter plug, it's warming up better and seems to be running fine. I just don't want to burn up the motor and I get paranoid about those things. Especially since money is super tight and getting a new bike is not an option


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post #6 of 20 (permalink) Old 06-06-2017, 05:24 PM
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Installing hotter plugs just "covers up" an existing problem.
It ran fine for the first 15 years of its life without them, and so it should continue.
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post #7 of 20 (permalink) Old 06-08-2017, 06:10 AM
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With the original plugs (CR7E), I had always problems with the rear one.
Since 3 or 4 years, I have changed the rear one to CR6E => no issues anymore.

Maybe we cover an existing problem, but fact is that the engine runs well and plugs color is OK. Could be something wrong in design ?? ..... too many VN800's has this issue.
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post #8 of 20 (permalink) Old 06-08-2017, 06:38 AM
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What problems exactly did You have?
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post #9 of 20 (permalink) Old 06-08-2017, 06:43 AM
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Quote:
Originally Posted by tehnis View Post
What problems exactly did You have?
I suppose you are asking me. If not , sorry...

When cold and starting the engine, first 2 min were running OK, but afterwards, the rear cylinder stops, plug complete black and wet.
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post #10 of 20 (permalink) Old 06-08-2017, 08:06 AM
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The hotter plug is covering up two problems:

1. Fuel tap that is leaking, or
2. Carb that need work, or
3. Both.
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