Hi all

[Daniel77]

So i joined to get some info. And maybe make some new freinds lol
Ive ridden bikes all my life. And i just turned 39 ugh, just bought my second
kx5 Is an 89, had a bunch of new parts on it but didnt run
It was relatively cheap though so. But Its always bad when a new
Bike comes with 2 big boxes of parts
It has new rims and spokes (excel) new tires (kenda washougal sticky?Lol)
new chain and sprockets 14 front 50 rear sunstar aluminum
Relatively new plastics old tank but not too bad a shape
New brake pads and rotor front. New master cylinder and pads rear
80w stator and a new wiesco 86mm piston and rings
Fmf gnarly pipe and powecore silencer
Boysen super bowl and reeds on a stock cage? 180 main jet not sure on the pilot
Oh and a k&n air filter
Sorry for all the info. But i always ask if someone asks me a ?
So like i said it wouldnt start.  Long story short. 70 psi compression test. 
The reeds are a little warped just on the edges. Maybe .002".
But that shouldnt effect compression yes? Because the exh ports are above the intake
And they are always open yes? I did a squish test before pulling the head it read .110"
That seems like a lot lol.  So i pulled the head and the very top edge of the cylinder has
What looks like rust pitting. These were electro plated origanally?  Does that rust? Did some
Dum dum hone it when they shouldnt have? Oh and yea the cylinder nuts were totaly loooooose. So. I pulled the jug and the intake bridges are cracked and the transfer bridges as well. Smh.
Any advice is welcome. I am a diesel mechanic with 15 years experience and have most any tool   So im not a dummy. Just know you all must know more about these things than i.
Thanks
Daniel

[sandblaster]

Hi Daniel.
Welcome to the forum.
To help us help you, what kind of riding will you be doing?

70 psi compression test.  
 

Bad... Needs at least a top end...

The reeds are a little warped just on the edges. Maybe .002".
But that shouldnt effect compression yes?

Correct, It won't effect your top end compression...
However, you want them to shut all the way...

I did a squish test before pulling the head it read .110"
That seems like a lot lol.  

.110" is a lot... How did you measure it?

So i pulled the head and the very top edge of the cylinder has
What looks like rust pitting. These were electro plated origanally?  

Yes.

Does that rust?

Yes.

Did some Dum dum hone it when they shouldnt have?  

Who knows... probably not... most likely just worn out..

Oh and yea the cylinder nuts were totaly loooooose. So. I pulled the jug and the intake bridges are cracked and the transfer bridges as well.

Easily repaired..
Any good plating shop can fix your cracks and re-plate your cylinder.
I use Millennium Technologies as I have had great success with them.
Plan on a full rebuild, crank, top end, all new bearings, seals, gaskets, springs, bushings... And carefully inspect your shift forks and gear dogs.... The K5 loves to destroy them..
Wossner piston, Wossner crank, Cometic or OEM gaskets.
There are some excellent builds on this site.
You might want to spend a evening or two reviewing them before you start.

[sandblaster]

There is a fair amount of info right here:

http://www.kxriders.com/forums/index.php/topic,8717.0.html

[umberto]

And get ready for a non stop assault on your wallet.   

[sandblaster]

It's only money 

[umberto]

It's only money 

That's what I keep telling my wife.   

[Daniel77]

 I measured the squish with a piece of solder in about 6 places through the spark plug hole
But once i realized the cylinder nuts were about to fall off i see it was a futile effort lol
You wouldnt recomend the wiesco with the "window" mod.  I see they were available here
Are they still? I did about a day or so of reading on this sight and others before i decided to join here You guys seem to genuinely want to help.  Its only money haha. Yea.  But when your done Its one of the badest things ever built  I did aquick port cleanup last night and its been in The parts washer spa since. I will send it to mellinium as soon as it is clean  I have to rebuild the shock and ive ordered a tripple tree and forks from a kfx450 04 i think it was .I also ordered all the bearings and seals for the swing arm, shock, wheels ,ect  ect ect

I appreciate any help or advice. Im sure this will be a long Process
Daniel

[Daniel77]

Oh yea.  And i mostly just trail ride, with a small amount of track time
And love to smoke my friends in drag races too lol
My other rides
00 warrior 350 stroked and poked to a 400
02 KX250 i fully restored this bike and as soon as i figure out how to upload photos i will
08 YFZ 450 is not pretty but it hauls the mail lol
89 KX500 just purchased ($1000 i thought it was a good price facepalm lol)
02 GSXR 750 mmmm hmmmmm


Daniel

[reklessj]

Welcome Daniel, every one here is super helpful and many members are knowledgeable beyond their years with the K5. So you chose wisely joining this group of guys and gals!!!! Where abouts you from?

[Daniel77]

I live in Henderson NC its just north of Raleigh

And its HOT in my garage. Lol.  My "just going to clean up the ports"
Went to a full port n polish.  Im just finishing up the transfers
Figure do that then send it to be plated and welded

Is there any member nears me?  Buscoe beach is a great place to ride
When its not crouded. 

[sandblaster]

You wouldnt recomend the wiesco with the "window" mod. 

Nope, too many of us have had issues with the Wiseco's.
Wossner with a window mod if you want the window.
I seem to remember that it makes about 1hp difference on the dyno.
But right now 86mm Wossner's are hard to get.
If it was me I would have Millennium bore it to use a 88mm Wossner and plate it.
More power, very little difference in cost.

[Daniel77]

Is there somewhere that sells a wossner with the window already?
88mm would be fine.  It going to be there anyway 

[umberto]

I had Millennium bore mine to 88mm and added a Wossner that I purchased from Sandblaster.  Be prepared to mess with your jetting, as the larger motor will mess with your carb settings quite a bit.  I eventually added a Lectron carb to mine, which seems to be a good solution for adjusting the jetting.  The thing is stupid fast though, even with a CR pipe on it.   

[Daniel77]

So.  Sandblaster.  Do I just buy a wossner and maybe you would be nice enough to let me ship
It to you?  Please😊
👍
Daniel