Please help.! This makes no sense.

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Please help.! This makes no sense.

Postby nate9521 » 04:59 pm May 06 2017

Got a 93 kdx200 with low end problem. Mid to full throttle is good and strong. On the low end there is hesitation and bogging. Thought it was lean so lowered the clip (raised the needle). Did nothing. I have to twist the throttle very very slowly to get through the low end without it cutting off. Then when i get off it will come down to an intermidiate idle position then after a while it will go back down to the original idle. Ive tried a bigger pilot and it didnt help. Im 90% sure there is no air leak. Sprayed around the engine and carb with starter fluid and no rev up. This is driving me crazy. Please does anyone have any idea what could be causing this horrible low end throttle response?

I have provided a link to a video of the bog

https://youtu.be/0_iIWK9s4_Q
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Re: Please help.! This makes no sense.

Postby Jason » 05:15 pm May 06 2017

dirty carb is where I would start
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Re: Please help.! This makes no sense.

Postby nate9521 » 05:53 pm May 06 2017

Jason wrote:dirty carb is where I would start


I promise you the carb is clean. I promise
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Please help.! This makes no sense.

Postby cornishwrecker220 » 06:07 am May 07 2017

I would check the float height & pilot jet ....wrong float height? ...clogged pilot jet ?

Also check the air screw , ....should be anywhere between 1 & 2 turns out
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Please help.! This makes no sense.

Postby nate9521 » 04:29 pm May 07 2017

Ive been reading about the jet block gasket. I did soak my carb overnight in cleaner. Could that gasket be causing my problems?
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Re: Please help.! This makes no sense.

Postby Jason » 04:49 pm May 07 2017

Was it the same before you dipped it?
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Re: Please help.! This makes no sense.

Postby nate9521 » 05:17 pm May 07 2017

Jason wrote:Was it the same before you dipped it?


Dont know. Bought bike after it had been sitting for years. Cleaned carb before i ever cranked it. I just cant think of anything else. All carb parameters are in spec and no air leaks
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Re: Please help.! This makes no sense.

Postby Jason » 06:17 pm May 07 2017

What did you dip it in?
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Re: Please help.! This makes no sense.

Postby nate9521 » 06:58 pm May 07 2017

Heavy duty carb cleaner. Think it was berryman
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Re: Please help.! This makes no sense.

Postby Jason » 07:06 pm May 07 2017

Well, honestly, it sounds like it never was running at all and now you have no clue as to why it won't run. It could be many things. Berryman's is a no-no for Keihin PWK carbs. I think we have a post about it once a month on here.
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Re: Please help.! This makes no sense.

Postby nate9521 » 07:11 pm May 07 2017

Jason wrote:Well, honestly, it sounds like it never was running at all and now you have no clue as to why it won't run. It could be many things. Berryman's is a no-no for Keihin PWK carbs. I think we have a post about it once a month on here.


It runs. It will idle and good top end. Just horrible low end
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Re: Please help.! This makes no sense.

Postby G22inSC » 07:13 pm May 07 2017

I know the jet block gasket and dipping comes up all the time. The issue is a lot of KDXs are bought used and you do t have any idea what a previous owner did or didn't do. Just because you may not have "dipped" the carb doesn't mean it's never been done, unless you bought the bike in question new.
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Re: Please help.! This makes no sense.

Postby nate9521 » 07:19 pm May 07 2017

G22inSC wrote:I know the jet block gasket and dipping comes up all the time. The issue is a lot of KDXs are bought used and you do t have any idea what a previous owner did or didn't do. Just because you may not have "dipped" the carb doesn't mean it's never been done, unless you bought the bike in question new.


So what are the symptoms of a bad jet block gasket? Its so confusing cause at low end the bog sounds lean like its not getting any gas but the plug is black which suggests its rich. Like i said idle and top end are good. Its just bog and die with quick throttle. and hanging idle
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Re: Please help.! This makes no sense.

Postby G22inSC » 08:45 pm May 07 2017

If I'm not mistaken, bad jet block gasket is a rich problem. A hanging idle or surge is a lean/air leak issue.
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Re: Please help.! This makes no sense.

Postby nate9521 » 09:08 pm May 07 2017

G22inSC wrote:If I'm not mistaken, bad jet block gasket is a rich problem. A hanging idle or surge is a lean/air leak issue.


Thats whats so confusing. There are rich and lean symptoms. The plug is black and oily
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Re: Please help.! This makes no sense.

Postby MaverickAus » 09:31 pm May 07 2017

nate9521 wrote:It runs. It will idle and good top end. Just horrible low end


Excuse me if this is stupid but isn't that a sign of bad powervalve?
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Re: Please help.! This makes no sense.

Postby Jason » 11:47 pm May 07 2017

Usually, it is no high RPM power / "won't rev out".
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Re: Please help.! This makes no sense.

Postby david » 07:34 am May 08 2017

What jets are in it?
'81 KDX 175
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Re: Please help.! This makes no sense.

Postby nate9521 » 09:31 am May 08 2017

david wrote:What jets are in it?


155 and 45
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Re: Please help.! This makes no sense.

Postby david » 11:14 am May 08 2017

That could be your issue. My bike hated those numbers. Stock is 48/150 and that is what works for me. I'm at about 450' elevation. Mine also had the lean bog off idle.

Also, make sure you are using fresh gas and you might want to replace the spark plug too.
'81 KDX 175
'90 KDX 200
'07 Vulcan 2000 Classic LT (totaled 4/25/15)
'82 Honda GL500 (sold)
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