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Old 03-29-2013, 02:20 PM   #1
pdxmotorhead OP
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Confirm my troubleshooting? 06-950 ADV

Ok,, just wan't to confirm a suspicion,, My 06 950 runs great ,, after its warmed up.. But its hard to keep it idling when cold and takes several starts. I bumped the idle up to 1500~ that helped a little,, bike has had the full "ectomy" list done (Poorly by the PO's mechanic,, I followed the HOW to clean it all up..)

l am suspecting I still have a vacuum leak somewhere,, or the TPS ,, Sound like the right things to start with? It supposedly just had the valves adjusted, and it runs very smooth and is I think fairly quiet for the breed. I could check the carb sync as well..

Bike: 06 950ADV 30K miles fresh oil change, air filter basically a winter service..

Thanks
Dave
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Old 03-29-2013, 02:37 PM   #2
OtownMike
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Sounds like a good start. Check the TPS first, its easiest, move on from there.
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Old 03-29-2013, 05:00 PM   #3
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WOTF - Great place to start
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Old 03-29-2013, 05:02 PM   #4
Blue&Yellow
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Could be old spark plugs or simply spark plugs that are a little too "cold" - if you use "warmer" sparkplugs they will wear faster but they usually work better for cold starts and the like.

Could also be weak old battery that gives a weak spark at low revs when the engine isn't charging that much.

Checking for vacuum leaks sounds good. If the problem persists also check the carbs, they are really sensitive even to minor leaks at low revs. Sometimes the rubber seals in the carbs dry out and start to leak, very strange problems can occur then.

After 30k it's not impossible that a carb rebuild could be a good idea if it's never been done - but start with the easy things first.

I doubt it's carb sync if it runs good when warm.
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Old 03-29-2013, 06:26 PM   #5
Orangecicle
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Carbs a little out of sync will do that. If mine are a little out of sync, the bike will die when on cold idle.

Yes, check the TPS. Check the plugs. Valves within spec?

I doubt it's a vacuum leak. Any sort of significant vacuum leak usually leads to a small backfire into the carb. It feels like it has a catch in the drivetrain -- like a chain jumping a sprocket. If you have doubts, seal off the vacuum ports on the heads and use the airflow carb balancer tool in the future.
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Old 03-29-2013, 07:09 PM   #6
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Hmm.. To do's

- Do the TPS....
- Throw the synch gage on just to check..
- Swap the heavy duty battery on just to test in the morning when its cold..
- Pull a plug and check it. (Duh,, the one thing I didn't do on this new to me bike.)
- If I don't find anything I'll pull the carbs and check the bowls for cruft.

I just found out this week I have a Ethanol free gas station with 92 and 104 on tap.. About 2 miles from my house! Whoot!
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Old 03-29-2013, 07:42 PM   #7
FINNDIAN
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check choke sync.
There is no adjustment but the cable housing can be shimmed where it sits in the carb.
Mine used to be a pita to run on the choke and chokes were way out of sync.
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Old 03-29-2013, 10:51 PM   #8
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Aha,,, yes that might be it,, I was noticing that the choke is a bit erratic, and it acts like its firing on one cyclinder well and not as well on the other.. HMM....

Thanks!
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Old 03-30-2013, 04:52 AM   #9
FINNDIAN
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Take the carbs off with the cables still attached. Put the choke on part way. Shine a small light in the choke passage and look in from the other end of the passage to make sure the plungers are lifted about the same distance.

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Old 03-30-2013, 04:57 AM   #10
Orangecicle
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If your front carb oily at times? Does the right exhaust smoke at startup at times? If you have the symptoms you could have a balancer shaft seal that is partially fouling your front spark plug at startup. My bike has 34K on it, and I just changed the balancer shaft seal this year. Very easy to change.
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Old 04-02-2013, 12:31 PM   #11
Steveman
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Quote:
Originally Posted by Orangecicle View Post
I doubt it's a vacuum leak. Any sort of significant vacuum leak usually leads to a small backfire into the carb.
That's correct. And vakuum leaks lead to a high idle even when engine is cold
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Old 04-02-2013, 05:09 PM   #12
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:) Good ideas,, I didn't get to it over the weekend ended up riding instead,,,

I'll have to pop the right tank off and fiddle with it..

Thanks
Dave
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Old 04-02-2013, 05:54 PM   #13
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I suspect I have some of the same gremlins. Gonna check it out as soon as the weather warms. Friggin 30s here in Militiagan...

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