stalling at high speeds - Kawasaki KLR 650 Forum
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post #1 of 11 Old 03-12-2013, 12:04 PM Thread Starter
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stalling at high speeds

Last season on 3 separate trips, my 08 with 80000+ kilometers would stall out at high speeds. Tach was in the 5000/5500 range and I run a 16th sprocket. It felt as if I had run out of fuel even though in all cases the tank was 3/4+ full. After sitting for a few minutes it would fire up again. The battery is good. Your thoughts would be appreciated.

byker
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1987 K100RS
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post #2 of 11 Old 03-12-2013, 12:11 PM
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How is the tune on the bike? Valves set correctly? What are the tank vent valves like? If you come to a stop like you say and open the tank is there a rush of air into the tank? Does the petcock work properly? Have you removed it to see if the small filters are clean? Have you cleaned the carb lately and I mean completely? A complete tear down and soak? What condition is your air filter? Maybe too much oil on it after a fresh oiling? How old is the plug?
How long do you allow it to rest after it does it? A long time or just a few minutes? If a long time perhaps a bad voltage rectifier or coil maybe even a CDI? These things I would only consider after all others were looked into. As they are the more expensive items. If you do need a CDI, I have a good one for the newer verson bike. Just saying. Are you doing the show this coming weekend?

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post #3 of 11 Old 03-12-2013, 12:25 PM Thread Starter
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Originally Posted by willys View Post
How is the tune on the bike? Valves set correctly? What are the tank vent valves like? If you come to a stop like you say and open the tank is there a rush of air into the tank? Does the petcock work properly? Have you removed it to see if the small filters are clean? Have you cleaned the carb lately and I mean completely? A complete tear down and soak? What condition is your air filter? Maybe too much oil on it after a fresh oiling? How old is the plug?
How long do you allow it to rest after it does it? A long time or just a few minutes? If a long time perhaps a bad voltage rectifier or coil maybe even a CDI? These things I would only consider after all others were looked into. As they are the more expensive items. If you do need a CDI, I have a good one for the newer verson bike. Just saying. Are you doing the show this coming weekend?
Plug is new; filter clean and not over-oiled; valves in proper spec; petcock cleaned; carb never touched. I do run seafoam every dozen tanks or so to keep all clean. When it dies, it takes less than a couple of minutes to start up again. As to opeing up tank fill cap, I have not done that. Not sure what you refer to in tank vent valves. Picture would be nice. I have to work this weekend so no show for me.

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2008 KLR 650 (108,000 kilometers and rising)
1987 K100RS
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post #4 of 11 Old 03-12-2013, 12:53 PM
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Quote:
Originally Posted by byker View Post
Plug is new; filter clean and not over-oiled; valves in proper spec; petcock cleaned; carb never touched. I do run seafoam every dozen tanks or so to keep all clean. When it dies, it takes less than a couple of minutes to start up again. As to opeing up tank fill cap, I have not done that. Not sure what you refer to in tank vent valves. Picture would be nice. I have to work this weekend so no show for me.


There are 2 vent lines coming off the back of the tank. Take the seat off and you'll see them.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #5 of 11 Old 03-12-2013, 12:55 PM Thread Starter
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There are 2 vent lines coming off the back of the tank. Take the seat off and you'll see them.
I know the one comming off the tank once you remove the tank. The second line is ?

byker
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1987 K100RS
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post #6 of 11 Old 03-12-2013, 12:58 PM
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Not there! On your bike.....

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post #7 of 11 Old 03-12-2013, 01:08 PM
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Quote:
Originally Posted by byker View Post
... Not sure what you refer to in tank vent valves...
The gas cap has vents in it which can fail to vent. When they do a vacuum can form in the tank which reduces the flow through the petcock. The symptoms are what you describe; stalling or loss of power at higher rpm/speed. When left for a short while the vents allow air back in and the bike will once again run normally.

See this thread. The mod is here.

T

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Last edited by Tom Schmitz; 03-12-2013 at 01:14 PM.
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post #8 of 11 Old 03-12-2013, 02:39 PM Thread Starter
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Quote:
Originally Posted by Tom Schmitz View Post
The gas cap has vents in it which can fail to vent. When they do a vacuum can form in the tank which reduces the flow through the petcock. The symptoms are what you describe; stalling or loss of power at higher rpm/speed. When left for a short while the vents allow air back in and the bike will once again run normally.

See this thread. The mod is here.

T
I had read this mod sometime ago and thought not to do it because of the side effect of gas leaking if the bike goes over. Having to eliminate the problem trumps side effect. Thanks for this. Do you know of any other mod that will eliminate the problem without the side effect?

byker
2008 KLR 650 (108,000 kilometers and rising)
1987 K100RS
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post #9 of 11 Old 03-12-2013, 02:45 PM
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Well, not really.

I should think replacing the seals would fix it, at least for a time. Maybe permanently, as many don't have this issue. I never have. You could try it as they can't be horribly expensive.

It looks like they are $3.56 at Ron Ayers.

I suppose the best route might be to do the mod and order the seals, replacing them when they came in. Unless you're snow-bound and don't need to ride right now.

T

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“Some days I feel like playing it smooth. Some days I feel like playing it like a waffle iron.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem

Last edited by Tom Schmitz; 03-12-2013 at 02:47 PM.
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post #10 of 11 Old 03-12-2013, 03:28 PM
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Byker don't do the mod....change the "O" rings instead! We discussed this before.....as we thought way back the side effects aren't pleasing if you do happen to get pinned under your bike.

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