1989 kx125 restoration master thread

[dinkyguitar]

Don't get her too dirty now 

dinky,

[queen of spodes]

I had the plug cap half removed yesterday.. went for another short ride a little while ago and the bike runs a little better now.   Still not as fast as a new YZ125 but not horrible now. 

[queen of spodes]

What's up with my jetting?   Mix is 32;1 with one step lower on pilot and main (rad valve).   Bike smokes badly and I already have dampness forming around the end of the silencer.    It has a bog off idle.. wants to load up if I don't rev it out. 

Power is mediocre as I mentioned.. ugh.  a little excitement around mid range and annoyingly flat on top.    Still have the stock pipe installed so I could try the kinda beat-up PC pipe I have.

First things first though.. what's up with the jetting?  I don't want to burn the bearings up but I also don't want to ride a lime green mosquito fogger.


Youtube from yesterday.. I just uploaded so give it a couple minutes to finish processing
http://youtu.be/qQGmPNThn3k

[queen of spodes]

Putting this here since it was hard to come up with..  I can't remember the main jet I have.. it's either 145 or 147.5.  Pretty sure I went with stock pilot and clip in 3rd spot.   Carb has a brand new $120 slide.   WIll pull bowl this week to confirm main jet size, but it seems like the bog/loading issue is either clip or pilot maybe.   Then again maybe my main is still off due to the smoke and spooge.

1989 Kawaski KX125 jetting specifications:

OEM jetting
Main         155
Pilot         52
Needle         R2067N
Clip         4th
Air Screw      1.5 turns out

Boyesen RAD jetting
Main         1-3 sizes smaller
Pilot         STD
Needle         STD
Clip         3rd
Air Screw      1.5 turns out

Pro circuit recommended jetting
Main Jet       155    
Pilot Jet      58    
Needle         STD
Clip         3rd    
Air Screw      1.5 out

FMF recommended jetting
Main Jet      148
Pilot Jet       62
Needle          STOCK
Clip Position   3RD
Air Screw       1.5 out

[bens87braap]

i will check my jetting on my 85  125 it rips with stock pipe after rebuild 1st 2nd 3rd gear lifts if u dont sit forward

[queen of spodes]

I owned an 85 and 86 kx125.. 89 is a different motor and carb so jetting will be a little different.     

Googling around this morning and it looks like this is the Jetting Bible:
http://dirtrider.net/forums3/threads/carb-tuning-canadian-daves-kdx.184671/

this is a little info in spooge:
http://motocrosshideout.com/2-stroke-dirt-bike-pre-mix-101/

I'm sure MXA did a full write up on jetting/spooge recently but I can't find the issue.

[queen of spodes]

Long story short, I had some bad gas.  I went ahead and moved my clip up to the 4th spot and kept the 150 main and 52 pilot.   Also threw on an old Pro Circuit pipe.. bike barks now.   Hope to get some better video soon. 

[queen of spodes]

Got the new clutch perch cover installed today:


and took apart the front caliper to find that the lower piston area was filled with gunk.   Dropped it in the ultrasonic, cleaned it up with brake cleaner then rebuilt using a Motion Pro kit:







finally received my two new brake rotors.   The ones on the bike were badly worn and slightly warped:


new front rotor:

[queen of spodes]

[sandblaster]

Nice job on the brakes.
Next to the suspension bearings it's one of the most ignored areas on bikes.... and yet.... they are so critical 

[queen of spodes]

Yes, and the PO's of this bike did absolutely nothing with the brakes.    Discs I picked up on Ebay last month (2 for $89) worked perfectly.

I entered this bike in an Evo race yesterday at Monster Mountain, here's some helmet cam:

https://www.youtube.com/watch?v=p_igIfXhy5M

[sandblaster]

That looked fun....
Your bike sure sounds like it is running good.

[sandblaster]

I like the show of respect that the yz250 guy gave you.
He had more power but had some issues with handling 

[bens87braap]

issues with handling..... He was all over the shop lol  Great race