Gp1200r plug diagnosis

[Msb454]

I finally got my ski out for the first time after a full rebuild. The ski runs great for the most part but I am getting some hesitation off idle. Sometimes I have to feather it just a bit then runs great. After about 20 mins of riding I pulled the plugs and seem like they are 3 different colors. Can anybody tell me what these plugs mean?

[Jonesyfxr]

What are your carb settings?

Usually, the plugs look similar. Kinda looks like you have one lean cylinder.

Did you do a plug chop, or pull plugs after riding 20 minutes?

[Msb454]

Everything is stock on the ski. I just pulled the plugs after 20 min of riding

[Jonesyfxr]

Ok, so you never installed t handles on the high and low speed adjusters? These skis are known to run lean from factory.

[Msb454]

No I have not, but I will if necessary. What would explain one cylinder being lean.

[Jonesyfxr]

Here is some information off the “How to” section.

http://greenhulk.net/forums/showthread.php?t=70129

But you need to remove the tamper proof caps to install t handles.

[steve45]

The white plug is way too lean. You MUST richen it or you'll burn up that cylinder very quickly.

I really don't like the gray plug. That cylinder may be having a meltdown. Gray deposits often mean metal is coming off the piston. I would do a compression test before riding it again.

[Msb454]

The middle plugs looks more gray in the picture but it is black from being too rich. I am gonna take the carbs back out and do the recipe. Anyone have the the info on the fuel to return mod?

[Jonesyfxr]

The search feature is your friend....

http://greenhulk.net/forums/showthread.php?t=177671

[Jonesyfxr]

You’ll also need to perform this mod....

http://greenhulk.net/forums/showthread.php?t=94630