Guys,
I am now a member of the "running on one cylinder" club. Likely to be a float issue......... Alot has been posted on that issue. Now I need to clean my carbs (95 900). Hopefully its a matter of debris and cleaning. I want to save my coin for the kehin flatslide upgrade. I am completely sold on the benefit I do not want to rebuild the stockers.
I have my air/batttery box off. Just to get me riding, I would prefer cleaning the carbs in place. I am not confident in my ability to do the tear down, soak etc. Partly lazy as well. Wrangling with the throttle cables and retuning seem monumental to me at the moment. If riding gets delayed much longer, my motivation and courage tends to change.
My question: How effectively can one clean carbs with them attached. It appears as though the float bowls and caps are super easy to reach. Would spraying carb cleaner and comressed air be effective or a waste of time?
and.....What can I remove and clean that will not need adjusting when I re-assemble?
Thanks!
Why are you assuming fuel/float issue?
What are the symptoms?
The vertical cylinder is not firing. I tried several new spark plugs. All become black and wet with fuel. I tried switching the coils. Still no vertical cylinder.
You are correct ducpainter. I am assuming. Based on the above and a lot of reading, I am assuming or at least leaning toward the conclusion that it is either a stuck float or and issue with the needle valve. I have to admit that I have not put a lot of time into investigating.
As always, any help is greatly appreciated!
I had a similar problem with my 98 M900, turned out one of the magnetic ignition pickups had gone bad, no pulse to the coil = no spark
fair enough...
I don't think it's a cleanliness issue though.
It could be a stuck needle/bad float or level.
Those things will cause plug fouling...among other things
How long before the plug fouls, or does it never run??
Did you swap ignitor boxes, or check the pick up in the left side cover?
The easiest thing is to swap out the ignitor boxes. They're the black things mounted on the battery box.
If you do that be very careful when disconnecting them. The boxes are very fragile.
Have you checked for spark on the bad cylinder? Easy enough to do. Remove ignition wire from spark plug, insert a small screwdriver or other metal item with an insulated handle, hold near a grounded piece of metal, crank engine, look for a nice blue spark. No or poor spark, follow ducpainter's advice.
Quote from: ducpainter on April 07, 2009, 07:46:51 PM
fair enough...
I don't think it's a cleanliness issue though.
It could be a stuck needle/bad float or level.
Those things will cause plug fouling...among other things
How long before the plug fouls, or does it never run??
Did you swap ignitor boxes, or check the pick up in the left side cover?
The easiest thing is to swap out the ignitor boxes. They're the black things mounted on the battery box.
If you do that be very careful when disconnecting them. The boxes are very fragile.
If you answer these questions, I'm sure we can figure out the problem very quickly.
The most important question is if the cylinder ever runs (as in, before the plugs are fouled)?
If you've never changed the needle jets (emulsion tubes) and needles, being that your bike is a '95, then that is most likely a major contributor to the problem. I would guess that the horizontal cylinder is running a bit rich as well.
I personally would take the carbs off and soak them in Yamaha carb dip, and take off the bowls and spray everything down with carb cleaner / compressed air at the very least. Anything else in my mind, your just wasting your time.
I've taken the carbs off of my supersport so much, I can practically do it in my sleep.
Thanks for all of the input gentlemen!
To answer your question Ducpainter: No , the vertical cylinder does not seem to fire at all. I have gotten a couple of pops and subtle back fire action but thats about it. After starting the bike cold with a new plug, I would get the verical cylinder only. When I pull the new plug, it is very wet with carbon and fuel.
I have not swapped the ignitor boxes or checked the pickup. I will do that this weekend.
Admitedly, I do nee to man up and tackle cleaning my own carbs!
Quote from: Tyler1150 on April 09, 2009, 05:40:53 PM
Thanks for all of the input gentlemen!
To answer your question Ducpainter: No , the vertical cylinder does not seem to fire at all. I have gotten a couple of pops and subtle back fire action but thats about it. After starting the bike cold with a new plug, I would get the verical cylinder only. When I pull the new plug, it is very wet with carbon and fuel.
I have not swapped the ignitor boxes or checked the pickup. I will do that this weekend.
Admitedly, I do nee to man up and tackle cleaning my own carbs!
Even with a stuck float, you should be able to get it started or at least get a few good back fires, especially with a fresh plug. Sounds like a spark issue to me.
Quote from: Jobu on April 10, 2009, 01:36:31 AM
Even with a stuck float, you should be able to get it started or at least get a few good back fires, especially with a fresh plug. Sounds like a spark issue to me.
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