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Old 06-26-2014, 06:49 PM   #1
Denalidirt OP
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Joined: Jul 2006
Location: Denali, Ak.
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Funny thing happened to me on my way to work

2005 950 adv runs like a champ.

I'm in 5th and at 4500 rpm it starts to sputter and loose power. A little more throttle pulls her out but still not perfect. It was pouring out. Doesn't happen in dry weather.
It stops when I ride out of the rain.
Power, lights, dash does not flicker
Air box looks clean.
I was thinking water could be getting into the combustion chamber on on cylinder?
Any ideas, thoughts, wisdom?
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Old 06-26-2014, 06:55 PM   #2
FongMan
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Id say Elec problem...
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Old 06-26-2014, 07:50 PM   #3
Zuber
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What he said. The ignition switch will get dirty and make the engine start missing, does it even in the dry.
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Old 06-26-2014, 09:04 PM   #4
Stephen
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Carb icing?
Sounds like the symptoms and conditions I've heard about; don't really get personal experience with it down here in Texas.
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Old 06-26-2014, 09:17 PM   #5
Denalidirt OP
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Checked electric

Started last year and that was my first stop. I cleaned and dialectic greased everything.
I was thinking air leak because it only happens at 4500 rmps. I'm thinking the vacuum at that rpm is enough to pull water into the air mix and cause the bike to struggle to get enough air.
Also when I pull the air box I see an oily stain on the too above the rear cylinder.
Problem is it only happens when it rains so it's hard to see if what I'm doing worked.
Not cold enough to freeze.
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Old 06-26-2014, 09:32 PM   #6
DesertSurfer
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Start with the common weaknesses...

Your issue is pretty hard to pinpoint through an internet questionnaire. I'd recommend starting with the areas of known weakness to the model before guessing narrowly. Dry it out and make sure ignition switch isn't shorting. Slight oil on top butterfly of carb is probably blow by from the crank breather...
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Old 06-26-2014, 09:36 PM   #7
FongMan
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Quote:
Originally Posted by Denalidirt View Post
Started last year and that was my first stop. I cleaned and dialectic greased everything.
I was thinking air leak because it only happens at 4500 rmps. I'm thinking the vacuum at that rpm is enough to pull water into the air mix and cause the bike to struggle to get enough air.
Also when I pull the air box I see an oily stain on the too above the rear cylinder.
Problem is it only happens when it rains so it's hard to see if what I'm doing worked.
Not cold enough to freeze.
Easy solve to this. Get a can of starting fluid, and a fire ex. Just because. withe the bike running spritz the starting fluid around the intake area of the bike....RPMs go up, thats a air leak.......
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Old 06-26-2014, 09:39 PM   #8
spafxer
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Quote:
Originally Posted by Denalidirt View Post
I was thinking air leak because it only happens at 4500 rmps. I'm thinking the vacuum at that rpm is enough to pull water into the air mix and cause the bike to struggle to get enough air.

Problem is it only happens when it rains so it's hard to see if what I'm doing worked.
Not cold enough to freeze.

The carburetors run much cooler than outside air due to fuel vaporization in the slide/venturi area... This makes icing a real possibility.

Since it's at one specific power setting, I would think electrical not the problem. Well, other than checking to make sure your carb heaters are plugged in and working. :loll
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Old 06-26-2014, 09:47 PM   #9
Denalidirt OP
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I don't think I have carb heaters on this USA model. I don't think it was standard equip for the 2005.5 USA
I will try the starter fluid trick.
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Old 06-27-2014, 02:28 AM   #10
motomal
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Sounds a lot like my carb icing symptoms.

I have a UK spec 950SM and when I used to commute all year round I would get carb icing quite a lot at constant throttle settings on the motorway in damp weather. The temp sensor for the carb heater only cuts in at 2 degrees Celsius if I recall correctly but I would get icing symptoms up to about 8 or 10 degrees. I added a small override switch I would flip on at starting and this almost eliminated the issue…

The heaters and the temp sensor are not expensive and if I recall correctly from Pyndon's experience taking a US bike back to the UK, the wiring is already there. Probably worth skipping the sensor though and just going for a manual switch if it is icing you are suffering.

Hope this helps
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Old 06-27-2014, 02:56 AM   #11
Peanuts
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Its a separate harness. Plugs into the ACC wiring behind the dash. The temperature sensor is close by, near the bottom triple clamp.

single cylinder version shown below but parts are same on twins
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Old 06-27-2014, 06:24 AM   #12
Black Hills
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did you happen to play with the jetting at all before this started happening?
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Old 06-27-2014, 06:55 AM   #13
charlie264
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If its the temp switch, Suzuki GS are the same as are the heaters.....check thread size first....
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Old 06-27-2014, 03:40 PM   #14
Questor
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I had a similar problem...
There is supposed to a rubber gasket at the top of the spark plug coil where the wire plugs in.
Mine was cracked and letting water into the coil in the front cylinder spark plug area. Water was coming off the front wheel and "shorting" out the front spark plug. Only happened at high speeds due the spray coming off the front tire.
Check for a small yellow rectangular gasket in the coil connection. Add dialectic grease and electrical tape as needed.

Easy to check, might be your problem.

Q~
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Old 06-27-2014, 07:35 PM   #15
Denalidirt OP
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Quote:
Originally Posted by Questor View Post
I had a similar problem...
There is supposed to a rubber gasket at the top of the spark plug coil where the wire plugs in.
Mine was cracked and letting water into the coil in the front cylinder spark plug area. Water was coming off the front wheel and "shorting" out the front spark plug. Only happened at high speeds due the spray coming off the front tire.
Check for a small yellow rectangular gasket in the coil connection. Add dialectic grease and electrical tape as needed.

Easy to check, might be your problem.

Q~
Roger that. I've done the rear and will give the front a go when I get a chance.
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