Bike constantly bogging down around 1/2 throttle

[newbie1993]

Just made sure the diaphrams had no tears or pinholes or anything. Made sure the o rings were in the vacuum ports and made sure all parts for the needle that goes into the diaphram had all of its parts secured and were in the right place. Boots between the airbox and carbs are secured and tight. I supposed the next step is to check float heights because when I did everything else same issue happened. Would incorrect float height cause this issue as well? And also I'm getting ready to make sure float heights are correct. What is the correct adjustment height again?

Sent from my LG-H901 using Tapatalk

[mr72]

yes low float height could cause this problem.

[newbie1993]

yes low float height could cause this problem.

Would you happen to know correct float measurement?

Sent from my LG-H901 using Tapatalk

[mr72]

IDK look in the wiki, has detailed instructions on setting float height.

[newbie1993]

If fuel comes out of the airbox what does that mean? I had it running and throttle was responsive and rpms were going up smoothly as i gave it throttle and then all of a sudden when i decided to take the bike for a ride the rpms have trouble going up and the bike dies and now im stuck and also the battery won't maintain a charge. And my portable jump box is dead.

Sent from my LG-H901 using Tapatalk

[newbie1993]

What would happen if i put the hoses from the tank petcock in the wrong place on the frame petcock?

Sent from my LG-H901 using Tapatalk

[Watcher]

http://wiki.gstwins.com/index.php?n=Maintenance.FloatHeight

Fuel out of the airbox means the carbs are overflowing.  Overflowing carbs means the the float is set wrong or the needle/seat is dirty/worn.

Battery not maintaining a charge could just be from having to screw with the motorcycle so much.  Not allowing it to run steadily for an extended period won't allow the motorcycle to recharge the battery effectively.


If the hoses from the tank go into the wrong place on the frame petcock the "on" and "res" positions could be switched around.
I'm honestly not sure what would happen if you tried to flow fuel into the out side, it might just not flow.

Here is the proper routing.

[newbie1993]

Have you ever used the see through fuel lines? If so, should all lines be full with fuel (i know the fuel line for prime should be) no matter what position the petcock is in?

The seats are fine and the needles are still pretty pointed on the ends and only should a small amount of wear. Im guessing that means the needles are set too high and arent closing when the float bowls are full causing fuel to overflow back into the upper parts of the carbs and back into the airbox and out of the overflow tube on the airbox.
I know how to check float heights using the tube method while the carbs are still mounted on the bike. However I dont know the measurement for correct adjustment. I would do the tube method just to be sure they are incorrect but havent had the time to get some tube. All I know is completely stock and the little tab on the floats are literally almost touching the top of the float directly above where the little tab is connected

Sent from my LG-H901 using Tapatalk

[newbie1993]

http://wiki.gstwins.com/index.php?n=Maintenance.FloatHeight

Fuel out of the airbox means the carbs are overflowing.  Overflowing carbs means the the float is set wrong or the needle/seat is dirty/worn.

Battery not maintaining a charge could just be from having to screw with the motorcycle so much.  Not allowing it to run steadily for an extended period won't allow the motorcycle to recharge the battery effectively.


If the hoses from the tank go into the wrong place on the frame petcock the "on" and "res" positions could be switched around.
I'm honestly not sure what would happen if you tried to flow fuel into the out side, it might just not flow.

Here is the proper routing.

Just saw your link. Much appreciated. I have vernier calipers however Im still a little confused. If I'm understanding correctly. I remove the carbs from the bike after emptying the float bowls and and everything. Flip them over, remove the float bowls and while float arms are kept free and touching the bottom ( or rather the top of the carbs body. And then using the calipers measure from the silver tab to where the float bowl gasket meets the body of the carbs and  adjust the little silver tab based on its position to where the float bowl meets the carb body. And the measurement should be 14.6 mm give or take a mm

Sent from my LG-H901 using Tapatalk

[The Buddha]

Fuel level should be @ the top of the bowl.
Into the airbox = too high, or stuck or some issue.
Cool.
Buddha.

[the_63]

Here's a couple of youtubes:

https://www.youtube.com/watch?v=aiexehn33kg

https://www.youtube.com/watch?v=PHuB1lyagKM

Chris

[newbie1993]

Is there a way to just measure the the distance of the metal tab from the float arm? I just feel like that would save a lot of time seeing as I have never used vernier calipers.

Sent from my LG-H901 using Tapatalk

[newbie1993]

Just checked float heights. Here are some pictures. Based on my current heights which are both wrong does the tab need to be adjusted up or down?

Float height in left carb




Float height in right carb



Sent from my LG-H901 using Tapatalk

[The Buddha]

Your petcock in prime when checking
Cool.
Buddha.

[newbie1993]

Your petcock in prime when checking
Cool.
Buddha.

Should it not be in prime?

Sent from my LG-H901 using Tapatalk

[The Buddha]

Your petcock in prime when checking
Cool.
Buddha.

Should it not be in prime?

Sent from my LG-H901 using Tapatalk

It should be, and if so, left is low, and right - well I am not sure, but it should be to the top of the bowl, and not have big air bubbles in the line.
I think I'm seeing some of those engine casting lines and not sure if its air or just the lines from that, but looks like left is waaaaaay off and right may be a mm or 3 off - both look low, leaving you leaner than Paris Hilton. Am I right ?

Cool.
Buddha.

[newbie1993]

Your petcock in prime when checking
Cool.
Buddha.

Should it not be in prime?

Sent from my LG-H901 using Tapatalk

It should be, and if so, left is low, and right - well I am not sure, but it should be to the top of the bowl, and not have big air bubbles in the line.
I think I'm seeing some of those engine casting lines and not sure if its air or just the lines from that, but looks like left is waaaaaay off and right may be a mm or 3 off - both look low, leaving you leaner than Paris Hilton. Am I right ?

Cool.
Buddha.

The right actually overflowed onto my hand. Meaning the tab is adjusted too low? And the tab on the left carb is adjusted too high or is it the other way around? And i wasnt sure if the those were air bubbles or something else. I just followed the instructions from the video in this thread about checking float heights. Im not completely up with all the technical terms so im not sure what you mean by engine line or lining. I

Sent from my LG-H901 using Tapatalk

[newbie1993]

And I thought overflowing into the airbox would mean i was too rich?

Sent from my LG-H901 using Tapatalk

[newbie1993]

Here are some brighter picture of the ones before so you can see where fuel begins in the tube and where it ends. Left you can see better but the right overflowed onto my fingers so you cant really see it that well unless you can see the fuel on my fingers and the overflow from the top of the tube near my fingers.

Sent from my LG-H901 using Tapatalk

[The Buddha]

And I thought overflowing into the airbox would mean i was too rich?

Sent from my LG-H901 using Tapatalk

Set your floats correctly, you may be getting blowby filling the airbox, and its likely due to the bike sitting and a few heat cycles could help cut down on that. I diagnose as I see it. If you're getting fuel in airbox, maybe the floats are getting stuck on occasion, otherwise they're lean ... or they tend to get stuck, this time they're stuck low, another time maybe stuck high.
Oh, try shaking the bike. See if the U tube levels change.
Cool.
Buddha.