Top end on KX80...and still probs...Powerband What??

litning · 08-29-2008

Ran bike again today....3rd time since top end rebuild.....(I have another thread with more info if reading this-1day ago)......so, now....it doesn't smoke as much, but it doesn't want to idle, will die if let it. But wow....first time on a dirt bike and I now know what powerband is....winding out a little in 2 or 3rd gear and up went the front end...I was like o boy!!!.
If anyone has any advice on my idling issues, I'd appreciate it.
But so far really liking the ride of a 2 stroke.

KickassKX125 · 09-01-2008

Stupid question, have you tryed adjusting the idle screw?

litning · 09-01-2008

Quote:

Originally Posted by KickassKX125

Stupid question, have you tryed adjusting the idle screw?

Hey, thanks for the reply.....sorry I didn't make myself clear on the other post....when adjusting the idle screw....I meant turning it clockwise all the way in.....when I took the carb back off...I checkd this and the idle screw controls the throttle valve, it does move up and down when adjusting the idle screw. So yea.....it's all the way in.
I ran it again yesterday....and when it warmed up...it kinda idled....but gave it throttle and let go, it dies. Thanks

Fatcat 1 · 09-01-2008

Try messing with your air screw as well. The Idle and the air screw usually work in tandem when it comes to idle and richness of mixture. If that doesn't work get a rebuild kit for the carb!

litning · 09-02-2008

I really appreciate that will do...it's set for 1.5 turn out now....
question.....i can't find any carb kits???
question different...how do you do a leak down test??? book says to use proper adapters.... to seal holes....any recommendations.
Thanks

Fatcat 1 · 09-03-2008

What year is your bike? You could have a number of thing causing it not to idle properly. bad reeds bad jetting for the pipe and silencer (given they aren't stock from start to finish). Try turning the air screw out some more until it reaches a high idle (on its own) and start working it back in

litning · 09-03-2008

It is a 94 kx80 with a fmf fatty pipe and boyesen rad valve.....I only know this because I have done lots of looking on the net and email...
Just so ya know yesterday, with the idle screw all the way in after it got warm and i pushed the choke starter back in it actually idled, not that good but it did. I think its rich...going to measure float today and check clip position....if stock at 4 going to put to 3rd from top. Thanks will post later to say what I found.
Thanks

litning · 09-04-2008

Alright..so I moved the clip from the 4th notch to the 3rd(could not believe how small that thing is, need like a magify glass)And measured the float-perfect....and adjusted the pilot air too. Now after bike warmed up alot less smoke except when on the throttle. I'm waiting for parts for both calipers...rebuilding them, so have to test higher throttle range later. Thanks

08-29-2008	#1 (permalink)
litning Kawwy Green Blood Join Date: Aug 2008 Location: Southwest Florida Posts: 17	Top end on KX80...and still probs...Powerband What?? Ran bike again today....3rd time since top end rebuild.....(I have another thread with more info if reading this-1day ago)......so, now....it doesn't smoke as much, but it doesn't want to idle, will die if let it. But wow....first time on a dirt bike and I now know what powerband is....winding out a little in 2 or 3rd gear and up went the front end...I was like o boy!!!. If anyone has any advice on my idling issues, I'd appreciate it. But so far really liking the ride of a 2 stroke.

09-01-2008	#2 (permalink)
KickassKX125 Now after another 125!! BTK Expert Join Date: May 2007 Location: Helmsley, North Yorkshire, England, UK Posts: 889	Stupid question, have you tryed adjusting the idle screw? __________________ Jamie 1996 CR250: 2 engines both with the same 1/2 missing! After another 125 to kill the garden!

09-03-2008	#6 (permalink)
Fatcat 1 Finally Got Into First Gear BTK Beginner Join Date: Jul 2008 Posts: 73	What year is your bike? You could have a number of thing causing it not to idle properly. bad reeds bad jetting for the pipe and silencer (given they aren't stock from start to finish). Try turning the air screw out some more until it reaches a high idle (on its own) and start working it back in Last edited by Fatcat 1 : 09-03-2008 at 11:03 AM.

09-04-2008	#8 (permalink)
litning Kawwy Green Blood Join Date: Aug 2008 Location: Southwest Florida Posts: 17	Alright..so I moved the clip from the 4th notch to the 3rd(could not believe how small that thing is, need like a magify glass)And measured the float-perfect....and adjusted the pilot air too. Now after bike warmed up alot less smoke except when on the throttle. I'm waiting for parts for both calipers...rebuilding them, so have to test higher throttle range later. Thanks Last edited by litning : 09-04-2008 at 03:22 PM.

09-01-2008	#4 (permalink)
Fatcat 1 Finally Got Into First Gear BTK Beginner Join Date: Jul 2008 Posts: 73	Try messing with your air screw as well. The Idle and the air screw usually work in tandem when it comes to idle and richness of mixture. If that doesn't work get a rebuild kit for the carb!

09-02-2008	#5 (permalink)
litning Kawwy Green Blood Join Date: Aug 2008 Location: Southwest Florida Posts: 17	I really appreciate that will do...it's set for 1.5 turn out now.... question.....i can't find any carb kits??? question different...how do you do a leak down test??? book says to use proper adapters.... to seal holes....any recommendations. Thanks

09-03-2008	#7 (permalink)
litning Kawwy Green Blood Join Date: Aug 2008 Location: Southwest Florida Posts: 17	It is a 94 kx80 with a fmf fatty pipe and boyesen rad valve.....I only know this because I have done lots of looking on the net and email... Just so ya know yesterday, with the idle screw all the way in after it got warm and i pushed the choke starter back in it actually idled, not that good but it did. I think its rich...going to measure float today and check clip position....if stock at 4 going to put to 3rd from top. Thanks will post later to say what I found. Thanks

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