help yz 125 high idled

C

CLUTCH444

Member

Apr 13, 2010

19

0

• Apr 19, 2010

• #1

help yz 125

hey

im trying to get my bike ready for track here in the next week and im having trouble with my bike. I rebuilt the top end, and redid some internals on the bottom block such as the water pump and push rod assy. for the power valve(never split the casing).However, now when i start it, it acts like its being held open at full throttle. The jets are right(stock), the carb slide is all the way down, the floats not jammed, the air/fuel and idle are set to stock. its got a new spark plug, new gaskets, and everything has been double checked for loose bolts for air leaks. Any suggestions are greatly appreciated.

thanks
taylor

#444

 

Last edited: Apr 19, 2010

Tony Eeds

Godspeed Tony.

N. Texas SP

Jun 9, 2002

9,535

0

• Apr 19, 2010

• #2

Welcome to the site, Taylor.

I moved this to 2 strokes for more views.

T

 

C

CLUTCH444

Member

Apr 13, 2010

19

0

• Apr 19, 2010

• Thread starter
• #3

I appreciate the help.
Thank You
taylor

 

J

_JOE_

~SPONSOR~

May 10, 2007

4,697

3

• Apr 19, 2010

• #4

Sounds like an air leak to me, how did you check it for leaks?

 

C

CLUTCH444

Member

Apr 13, 2010

19

0

• Apr 19, 2010

• Thread starter
• #5

I took the engine out of the bike. retorqued every bolt. im taking a propane bottle to it tonight to double check.

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Apr 19, 2010

• #6

If it was me, I would NOT use propane. Non-chlorinated brake cleaner and baby powder is a lot safer. You are more than sure the slide is closing all the way? Have you checked the plug? Wet or dry? Vintage Bob

 

M

mathd

Member

Oct 11, 2008

208

0

• Apr 20, 2010

• #7

No propane bottle,
Make sure the carb slide is closing properly once again even if you did already.
Check the spark plug wet/dry.

 

C

CLUTCH444

Member

Apr 13, 2010

19

0

• Apr 20, 2010

• Thread starter
• #8

ill check the carb slide again and wet/dry plug. i just got the material to make a leak down tester as well. i noticed last night that when i started it once, and dipped the bike to check the float, it dumped a bunch of fuel out the carb. does this mean a faulty float or carb? could this be causing part of the issue?

thanks again
taylor

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Apr 20, 2010

• #9

If you get the bike laid on its side, fuel should come out. Any cracks in the intake rubber? Vintage Bob

 

C

CLUTCH444

Member

Apr 13, 2010

19

0

• Apr 26, 2010

• Thread starter
• #10

Hey wanted to thank you guy for your help. It was a faulty gasket on the intake boot that i had overlooked....its always the easy sh*t that gets ya in the end. Engine runs perfect now.

See ya on the dirt
Taylor