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Old August 9th, 2013, 01:27 AM   #1
djjontran
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Idle issue

So bike starts fine and seems to be okay until it warms up then it won't idle. Basically if it's sitting under 3k rpm it will stall. I've cleaned the carbs, turned the air fuel mixture screws out 2 1/2 turns, cleaned the air box, replaced the fuel filter, and I'm getting good fuel flow. I pulled the spark plugs and saw that it's for sure running rich. I checked the float height and it seemed to be good. I'm thinking float valves need to be replaced. Any other ideas?
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Old August 9th, 2013, 04:01 AM   #2
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You sure your carbs are clean? If it's not idling right it could be your pilot/slow jets are still clogged.
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Old August 9th, 2013, 07:09 AM   #3
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Originally Posted by djjontran View Post
...........Any other ideas?
http://www.ninjette.org/forums/showt...lve#post722509
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Old August 9th, 2013, 11:21 AM   #4
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when was your last valve adjustment / carb sync?
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Old August 9th, 2013, 07:27 PM   #5
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Quote:
Originally Posted by Motofool View Post
This looks like what I've got going on. Adjusted the float bowls and noticed that one was about 7-8mm too high. Took it for a ride around the block and as I let it sit and idle it stalls and then would not start again. Going to try replacing the float valves next. If that doesn't work then I guess I'll need new carbs :/

Quote:
Originally Posted by Lychee View Post
when was your last valve adjustment / carb sync?
I rebuilt the top end so all valves have been adjusted and synched the carbs right after. The bike ran fine for a week and then I started getting this problem.
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Old August 9th, 2013, 08:36 PM   #6
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Replaced the float valves still didn't work
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Old August 10th, 2013, 05:59 AM   #7
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Did you pull out the pilot jets and clean them when you had the carbs off?

The Pilot jets are the ones with a slot, set deep down inside the round "tube" in the bottom of the carb, and have a very small opening.
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Old August 10th, 2013, 08:54 AM   #8
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Did you pull out the pilot jets and clean them when you had the carbs off?

The Pilot jets are the ones with a slot, set deep down inside the round "tube" in the bottom of the carb, and have a very small opening.
Yeah I did. I'm going to try taking a guitar string through the inlet of the pilot jet on the actual carburetor. Music shop opens at 10 so I will let you all know how it goes in a couple of hours.
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Old August 10th, 2013, 12:03 PM   #9
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Still no luck
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Old August 10th, 2013, 12:41 PM   #10
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.......I rebuilt the top end so all valves have been adjusted and synched the carbs right after. The bike ran fine for a week and then I started getting this problem.
As this problem is time related, I would open the valve cover and re-check the adjustment of all the valves.

Also, connectors that were removed for the valve adjustment, especially the ones for both spark coils (red goes to the lower connector).

Unless it is a fuel supply or water contamination problem, carburetors don't misbehave so dramatically in one week.
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Old August 11th, 2013, 07:13 AM   #11
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Quote:
Originally Posted by Motofool View Post
As this problem is time related, I would open the valve cover and re-check the adjustment of all the valves.

Also, connectors that were removed for the valve adjustment, especially the ones for both spark coils (red goes to the lower connector).

Unless it is a fuel supply or water contamination problem, carburetors don't misbehave so dramatically in one week.
oooh good point! I'll try that on Tuesday when I have a day off.
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Old August 11th, 2013, 10:33 PM   #12
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Quote:
Originally Posted by Motofool View Post
As this problem is time related, I would open the valve cover and re-check the adjustment of all the valves.

Also, connectors that were removed for the valve adjustment, especially the ones for both spark coils (red goes to the lower connector).

Unless it is a fuel supply or water contamination problem, carburetors don't misbehave so dramatically in one week.
Just out of curiosity. How would valves cause an engine to run rich? If intake valve lash is too tight too much air/fuel is getting into the engine?
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Old August 12th, 2013, 05:34 AM   #13
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Just out of curiosity. How would valves cause an engine to run rich? If intake valve lash is too tight too much air/fuel is getting into the engine?
Valves will not affect the mix, only the timing.

Sometimes, one or more valves lose the adjustment quickly after a valve job in the pre-gens, causing idle problems.
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Old August 13th, 2013, 01:06 AM   #14
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Woo! @Motofool that's another win you can add to your record
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Old August 13th, 2013, 07:02 AM   #15
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Woo! @Motofool that's another win you can add to your record
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Old August 13th, 2013, 07:09 AM   #16
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Lol it idle's fine now. I adjusted the valves and I also changed the oil because it smelled like straight up gasoline. Got flooded pretty bad when I kept trying to start it after it stalled so many times
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Old August 13th, 2013, 07:32 AM   #17
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Keep an eye on the odor of the oil, just in case you have some sneaky leak of fuel down the crankcase via petcock, floats' valves and intake valves while the engine is off.
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Old August 13th, 2013, 09:00 AM   #18
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Quote:
Originally Posted by Motofool View Post


Keep an eye on the odor of the oil, just in case you have some sneaky leak of fuel down the crankcase via petcock, floats' valves and intake valves while the engine is off.
Okay will do. Thanks again!!
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Old August 17th, 2013, 07:54 AM   #19
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Gahhh!! So I took the bike out yesterday and I decided to take it top speed. When I got home though I was going up my driveway and as I was releasing the clutch and opening the throttle it started to bog down and stall. Then trying to start it it will barely start and then when I twist the throttle it will stall. I'm guessing my valve clearance got messed up again after I topped out the bike. All the vibration made it get tight? How tight do I need to make the lock nut when I adjust the valves?
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Old August 17th, 2013, 08:36 AM   #20
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..........How tight do I need to make the lock nut when I adjust the valves?

"NOTE: Torque value for tappet locknuts: The original manual says 14.5 ft/lbs. The supplement says 13 ft/lbs. It's recommended to use about 12."


Do not over-torque them !!!

Read these:

http://n4mwd.blogspot.com/2013/06/ov...ts-during.html

http://faq.ninja250.org/wiki/How_do_..._the_valves%3F

Before attacking the valves again, check that your bowls have enough fuel inside.
It sounds like fuel starvation to me (open throttle introduces too much air in the mix because the vacuum in the throttle (Venturi effect) is not able to lift and suck enough fuel from the bowls).
It may be a simple plumbing system's problem (check in-line filters and vacuum hoses feeding the petcock for clogging and leaks respectively).
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Old August 17th, 2013, 09:11 AM   #21
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@Motofool yeesh hopefully nothing is damaged. I was looking for a torque spec in my clymber's manual and it just said to secure tightly. Man I really hope it's not bad. So I should use 12 ft lbs?

I have to check the level of gas while its running right?

Last futzed with by djjontran; August 17th, 2013 at 12:43 PM.
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Old August 17th, 2013, 05:44 PM   #22
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Soooo I'm an idiot. I go to pull off the tank to check the valves and realize I have barely any gas in it. Flipped the switch to reserve rode it to a gas station and all is good again. Bahahaha!! I'm a noob.
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Old August 17th, 2013, 07:14 PM   #23
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Soooo I'm an idiot........ Bahahaha!! I'm a noob.
No, that happens to anyone.

Save the torque info for the next valve adjustment.

Ride much and safely !!!
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Old August 17th, 2013, 09:33 PM   #24
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@Motofool we need to make a fan club for you. you have fixed more bikes on here then most shops.
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Old August 17th, 2013, 09:51 PM   #25
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@Motofool we need to make a fan club for you. you have fixed more bikes on here then most shops.
Thanks Lupe, but no, I have just shown the path to some beginners, sometimes correctly.
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Old August 18th, 2013, 12:01 AM   #26
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Thanks Lupe, but no, I have just shown the path to some beginners, sometimes correctly.
Hahah seriously though. You're awesome
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Old August 18th, 2013, 08:09 AM   #27
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Hahah seriously though. You're awesome
Thanks, Jonathan; it is only that I have been messing with these machines since the 1960s', accumulating some experience at the end of many many mistakes.

There is a lot of awesome members in this forum, younger and older, some post abundantly, some frugally, but there is a lot to learn from each of them.

Visit Member of the Month and old threads about repairing and riding and you will find those names easily.
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Old August 18th, 2013, 09:00 AM   #28
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Thanks, Jonathan; it is only that I have been messing with these machines since the 1960s', accumulating some experience at the end of many many mistakes.

There is a lot of awesome members in this forum, younger and older, some post abundantly, some frugally, but there is a lot to learn from each of them.

Visit Member of the Month and old threads about repairing and riding and you will find those names easily.
mos def, this is the best motorcycle community on the net, even when people like me drop off for half a year, i can just jump back in without a harsh comment or snide remark. i love this place, and i love some of the amazing members on here that have helped hundreds of riders fix their babies and get back on the road.
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