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Old September 13th, 2014, 07:25 PM   #1
archaeofreak
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Help fishdip destroyed my bike!

OK, just kidding, mostly.

Its not an issue of the bike running, but it wont start up consistently.

Also, once it is started, it runs sometimes just fine, but at other times it slowly dies.

Here is what we have completed so far:

Valves
carb check
changed plugs
new air filter

could this possibly have something to do with the fuel in tank? We are not sure how old it is.

Any suggestions?
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Old September 14th, 2014, 06:44 AM   #2
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Have you adjusted the idle mixture screws and set the idle speed to 1300?

And yes - it could definitely have something to do with old fuel. Drain the tank completely and empty the floatbowls before doing much else. Run ethanol-free 87 octane, or the lowest octane without ethanol, and I'd add 1 oz per gal of Chevron Techron Concentrate once a year.

You still want to get the idle mixture adjusted properly. Usually that is in the range of 2 1/2 turns out, then reset the idle speed. If the carbs haven't been synced lately I would do that as well.

Those things (good fuel, correct idle mixture settings, correct idle speed, and carb sync) all need to be right in order to get it to idle properly.
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Old September 14th, 2014, 08:13 AM   #3
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Yep idle mixture screws adjusted 2.5 turns and idle speed set at around 1300 RPMs. Carbs were synced visually also.

I guess old gas is the only explanation left.
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Old September 15th, 2014, 07:38 AM   #4
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any other ideas?
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Old September 15th, 2014, 04:14 PM   #5
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You have got the right idea with blaming fishdip, however you still have possession of the problem, which is probably dirt in the idle circuit necessitating a tedious carb strip and blow through along with fitting an inline fuel filter if you haven't already.

Or you can keep blipping the throttle and swear at it a lot which is the technique under 18s usually use in my neighborhood
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Old September 15th, 2014, 06:46 PM   #6
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Well, there is a lot of sediment in the gas tank, and we didn't really do a thorough carb cleaning...but we did install a larger in-line fuel filter already. I was thinking it might be something with the CA emissions junk, but I just checked all the hoses and if nothing else, they are attached correctly. Also, it ran the first four days in a row when I bought it (but then it sat for 2-3 weeks, and I don't know the previous maintenance history before the first four days). The gas in the tank is what came with it though, so changing the fuel is an obvious thing to try next :-)
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Old September 15th, 2014, 08:25 PM   #7
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Random thought, may be nothing... Is any part of the CA junk filled with fuel?

My symptoms had the bike acting like it was out of fuel, despite having two gallons in the tank. The shop had to drain the entire system of fuel that had overflowed.
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Old September 15th, 2014, 09:16 PM   #8
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Not sure about whether the CA junk is filled with fuel. I am not sure how that would happen, but its possible I guess. I will check that this weekend!
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Old September 15th, 2014, 09:26 PM   #9
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If fuel overflows due to expansion or overfilling the tank, unlike the rest of the world, CA bikes don't drain out to the ground. Instead it flows into the emissions canister. Too much and it doesn't evaporate.

Since you're in AZ, there's a few helpful threads on here to get rid of that thing. I just bypassed mine and haven't taken the time to chuck it completely.

Hopefully that helps. *fingers crossed*
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Old September 16th, 2014, 05:45 AM   #10
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Old September 16th, 2014, 07:37 AM   #11
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sounds like gummed up petcock valving
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Old September 16th, 2014, 07:41 AM   #12
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sounds like gummed up petcock valving
we have not taken that apart yet. What gets me is once it starts it runs just fine. but it takes us 10min to get it started.
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Old September 16th, 2014, 08:28 AM   #13
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Quote:
Originally Posted by fishdip View Post
we have not taken that apart yet. What gets me is once it starts it runs just fine. but it takes us 10min to get it started.
correlating symptoms of gummed up petcock valve would be once you got it started and ran at 80 on the freeway for awhile and then stop, it starts flooding and dies, or after turning it off it starts leaking gas out the carb overflow.

easiest way to see whats going on is put a clear tube on the carb drain line and open it up with the tube going up... the gas will flow into the tube up to the height the fuel is in the carb... so you can see how high the fuel in the carb is. does it drain? does it overfill?
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Old September 17th, 2014, 04:44 AM   #14
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Carbs still dirty and/or bad gas. Take the jets out and soak them and clear out all the passageways including the choke. If your tank is so nasty it's clogging up the petcock filter and carbs I would install a fuel filter before running any more gas through the carb.
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Old September 17th, 2014, 05:04 AM   #15
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^^^ Wot he said
Don't forget that the fine rust dust that gets through the tap filter, although made of tiny particles too small to block a jet on their own can accumulate in the carb and coagulate into bigger chunks.
Thats why you need the fine mesh line filter that you have fitted.
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Old September 17th, 2014, 07:24 AM   #16
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Carbs still dirty and/or bad gas. Take the jets out and soak them and clear out all the passageways including the choke. If your tank is so nasty it's clogging up the petcock filter and carbs I would install a fuel filter before running any more gas through the carb.
already have a in line fuel filter.
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Old September 21st, 2014, 03:11 PM   #17
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We gave the carbs a better cleaning and got it running fine so far!
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Old October 8th, 2014, 11:19 AM   #18
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already have a in line fuel filter.
Heard about these causing a lot of problems when people add them. There is already a filter in the petcock and another where the hose connects to the carbs (fits inside). Not sure that it needs a third filter anyway.
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Old October 8th, 2014, 11:38 AM   #19
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If you have sediment in your tank remove it now!!! You need your tank clean; otherwise you won't solve your problem.
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Old October 8th, 2014, 11:44 AM   #20
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Heard about these causing a lot of problems when people add them. There is already a filter in the petcock and another where the hose connects to the carbs (fits inside). Not sure that it needs a third filter anyway.
The added filter has a much larger surface area and is filter material not just a mesh. I used to get a build up of rust powder from the (25 year old) tank caking in the carb bowls but by and large it stops it. So I'll give a filter +1.
It is a short run from tank to carb though so the plumbing has to be just right.
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Old October 8th, 2014, 11:54 AM   #21
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The added filter has a much larger surface area and is filter material not just a mesh. I used to get a build up of rust powder from the (25 year old) tank caking in the carb bowls but by and large it stops it. So I'll give a filter +1.
It is a short run from tank to carb though so the plumbing has to be just right.
I'm not saying that it's not bigger and better, I'm saying that lots of people with bigger and better ones had fuel supply issues that they insisted shouldn't be caused by their high-flow filters that ultimately were caused by it. Worth a look I think, especially if you drain the fuel and start fresh.
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Old October 8th, 2014, 12:10 PM   #22
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I'm not saying that it's not bigger and better, I'm saying that lots of people with bigger and better ones had fuel supply issues that they insisted shouldn't be caused by their high-flow filters that ultimately were caused by it. Worth a look I think, especially if you drain the fuel and start fresh.
True, I'm not disputing that people get it wrong, usually down to poor routing or failure to change it regularly. Being finer it catches stuff that usually goes straight through the carb so paradoxically will clog faster than the little carb inlet filter mesh.
ie you cant leave them unchanged for years, but people do.
That said if (unlike 1991 pregen me)you have a clean rust free tank TBH it is superfluous
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Old October 8th, 2014, 05:13 PM   #23
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I've installed inline filters on all my bikes with no problems. I suspect those that had problems used a filter designed for fuel pumps, not a gravity flow system.

These work well and can be obtained at many auto parts stores: http://www.amazon.com/Visu-Filter-In...068296&sr=1-14
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