Suzuki V-Strom (VStrom) Owners Club DL250, DL650, DL1000 & DL1050
V-Strom specific discussion => V-Strom specific discussion => Topic started by: Theflyingscot on March 15, 2015, 13:58:43
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Just finished a quick service on the Vee.
Now this may be a daft question but I purchased CR8EIX plugs but the ones I have removed are CR9EX, after looking through the owners manual it states to fit the CR9's if the CR8's overheat.
How can you tell if your spark plugs are overheating?
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You are running a liquid cooled bike on the street. Stick to the 8s. Whoever put the 9s in was confounded by theory.
A plug that runs hot will exhibit faster electrode erosion.
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Thanks for that, would the 9s contribute to poor running?
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Poor running could occur if the electrodes were worn.
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They looked in okay condition, a little sooty though.
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The higher the number, the cooler the plug will run I.e. it is less likely to over heat if the bike is driven very hard. Using a cooler plug (higher number e.g. 9 rather than 8) than the engine needs is more likely to foul as it doesn't run hot enough to be within it's design limits. I can't really see any situation where 9 grade plugs would need to be used a Vee except perhaps speed testing at Daytona! Even the TL1000 sport bikes only used 8 grade plugs.
If they a bit sooty, this could indicate that they're not getting hot enough. Hence the 8 grade plugs would be a better choice.
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Yeah, I got it backwards. 9s are cooler and will tend to develop deposits that could affect running.
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That would explain it then, let's see how the proper plugs do.
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I fitted CR8EIX plugs to my brothers vee. It runs perfectly well on them.
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The CR8EIX Iridiums will be fine and should last 30,000+ miles. I've had a set in mine for over 20k and still going fine.