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Old 02-12-2014, 10:10 PM   #1
seanster
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need some pointers working out carbs

Hi all,

So I have some issues on my project (it's a 900 motor with Minikis Carbs)

I cleaned and installed new jet kits (mains (with seals), pilots, needles, etc.) all specs were set as recommended for my carbs. Even adjusted the float bowls.

So let assumed that I have everything correctly put together.

when I installed the carbs back and trying to start, the motor turns over but will not catch. I checked the spark plugs and test to see if I get "sparks" which I did. And the plugs were dry. Also, I assured that I got fuel into the bowls.

What do you think could be the problems here? Could it be that somehow the gas is not getting through? I checked the induction ports and didn't see any fuel what-so-ever. Some how fuel is in the bowls but not going into the engine?

I'm sure I have cleaned my carbs very good (even taking very small wires to make sure nothing clogged up in there).

FYI - the carbs I bought from ebay was only $65 and was sitting on the shelves for some times.

Any help will greatly appreciated!

Sean.
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Old 02-12-2014, 10:45 PM   #2
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When you cleaned the carbs did you also soak the bodies and blow through the passages?
What's your float height set at?
What's your fuel screws set at?
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Old 02-12-2014, 11:12 PM   #3
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Patrick will get you squared away, you likely have varnish in the little passageways. A good soak and lots of compressed air through the circuits should fix you up, make sure you take all the rubber parts out before soaking.
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Old 02-13-2014, 07:36 PM   #4
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Quote:
Originally Posted by Patrick View Post
When you cleaned the carbs did you also soak the bodies and blow through the passages?
What's your float height set at?
What's your fuel screws set at?
I sprayed (generously) of the bodies with carb cleaner. Through passages and such, and took some very thin electrical wires to ensure nothing clogged. And also blow some compress air through.

I have my floats set at 14mm as recommended where factory was 12mm I believed.

More on adjustments: Factory Pro Kit
-Needles set at 3rd position (top down)
-main jet 150
-pilot jet 42.5
-float at 14mm
-fuel screw 3 turns out

Thanks!
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Old 02-13-2014, 07:44 PM   #5
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Does it try to hit at all or just spins over?
That model had a small vacuum opertated fuel pump on it. Is it still there and does it operate?
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Old 02-14-2014, 06:01 PM   #6
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Patrick,

Just spin over, I don't think it's trying to hit at all.

Yeah I have a small vacuum fuel pump. It's seem to be in working condition. Gas got into the float bowls.

Since its not starting the gas leaks out from the bottom of the bowl.
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Old 02-14-2014, 10:18 PM   #7
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Gas should not leak from the bottom of the bowl, period.
If you bump it with a bit of ether will she try to fire?
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Old 02-14-2014, 11:01 PM   #8
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Patrick,

Gas leak from the bowl bc I over tighten the drain screws and damaged the interface of the bowl (need to get a replacement bowls). However I'm just stating that to identify that there're fuel in the bowl.

I'm going to try to spray some fuel into the induction port and try to start and see. Will report back soon. Thanks!
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Old 02-14-2014, 11:03 PM   #9
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possible valves are out of spec?
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Old 02-15-2014, 11:24 AM   #10
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See...that's next on my list that I have read too.

I'm taking one step of the time, and trying to see if anyone can give me any pointers.

right now i'm checking: Air, Fuel...
then to valves...but man I have never done that before.
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Old 02-18-2014, 08:23 PM   #11
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gave it another try today and still wouldn't catch :( I don't know what to do now.

I don't think the valves are out of spec (at least, not bad to the point that it wouldn't start).

What do you suggest?

thanks! (sorry I'm a little frustrated)
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Old 02-18-2014, 09:23 PM   #12
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shoot it with a little ether and see if it starts for a sec
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Old 02-18-2014, 10:29 PM   #13
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Let's verify the basics.
Run a compression test, making sure to hold the throttle wide open while doing it.
Next, verify you have spark.
Post up what you find.
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Old 02-18-2014, 10:54 PM   #14
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Do you have the air cleaner on the bike?
It may need the resistance to create vacuum in the carb and draw the fuel up from the bowl.
Often the case if the carbs do not have fuel squiters (internal)
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Old 02-19-2014, 12:00 AM   #15
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Thanks all.

So here's what I did after I post last message before read all yours

I went ahead and remove the pod filters
Added a few drops of fuel into the carbs.
And she actually catches for a second or two.

What should I do next? Replace my carbs? Someone told me to check my butterfly valves, not sure of that but still researching.

Thanks again.
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Old 02-19-2014, 01:24 AM   #16
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Take your carbs apart again and make sure your pilot jets are clean.
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Old 02-19-2014, 09:16 PM   #17
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If you are sure the jets are clean and have the stock air filter try it and perhaps a shot of engine starting fluid.

Tuning Tips found at holeshot.com

I had on 03 1200S Suzuki Bandit for 38K Miles
Bike was basically stock (Stock carbs Mikuni) Best performance was obtained when all jets were clean (As I recall Jetted up slightly on the main jet and the pilot jet, I forget the jet sizes now, floats set correctly with the stock air filter in place (I did add 1 hole to the air box about the size of a quarter) With no air box the bike would not start, with bike running and opening he air box it would die, Stock air box and K&N filter it could be difficult start.
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Old 03-07-2014, 04:53 PM   #18
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so some update....not much progress here though.

I clean and clean and clean and adjusted the floats...still the same, I'm still not getting fuels into the engine. I'm so that nothing clogged in the carbs.

I tried direct feed (bypassing the vaccum fuel pump) to the carbs and check the drain screws that there are fuels in the bowls.

so I dropped a few drops of fuels into the air intake of the carbs...the bike caught on fire (okay not literally haha)....that's a good sign right?

What are my option next?

thanks!
I might truck it to Patrick if i can't get it running. Can you work within my budget Patrick (I guess I better call you over the phone)
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Old 03-07-2014, 05:54 PM   #19
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Did you try the stock air box with stock Air filter and a shot of engine starting fluid?
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Old 03-07-2014, 08:18 PM   #20
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Something's up with your inlet needles.
With the carbs on the workbench upside down with the float bowl off hook up an i.v. to the fuel inlet.
Lift each float so the inlet needle comes off the seat and see if you get fuel flow.
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