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Author Topic: 90 KX250 rebuild  (Read 57010 times)

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Offline ecdeyzel

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Re: 90 KX250 rebuild
« Reply #30 on: August 23, 2015, 08:28:12 PM »
Quote from: SOHC on August 23, 2015, 08:24:17 PM
How would a flywheel wight change the power?
 

As far as I understand it, it is made to smooth out the power delivery of the engine, making a little less wild and also a little less easy to stall. Good for technical riding like rock gardens or single track woods riding etc.
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2007 Suzuki DR650SE
1999 Kawasaki KX250 (Rebuild in Progress)

Offline SOHC

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Re: 90 KX250 rebuild
« Reply #31 on: August 23, 2015, 10:25:13 PM »
I can see someone has removed something from the rotor with the magnets, it must have had a steel disk riveted to it at some stage. 
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #32 on: August 23, 2015, 10:28:03 PM »
One question are the front engine plates steel or aluminum for my bike? they were missing but I got some KDX ones and they are steel.
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #33 on: August 25, 2015, 01:43:52 PM »
I got my replated exchange cylinder, its the wrong one,  :-(
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #34 on: August 30, 2015, 05:24:06 PM »
I got this power-valve governor rod on ebay, its brand new :)

 

Also I got a new set of steering bearings and put my front end on, and rear shock and s**t is going back together.

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Offline sandblaster

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Re: 90 KX250 rebuild
« Reply #35 on: August 30, 2015, 05:47:22 PM »
Looking great!
Keep the progress moving forward  8-)
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline SOHC

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Re: 90 KX250 rebuild
« Reply #36 on: August 30, 2015, 07:47:38 PM »
Next plan is to get the rod kit and crank done then I can put the cases to together and with any luck my cylinder will turn up. 
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Offline Leekatron

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Re: 90 KX250 rebuild
« Reply #37 on: August 31, 2015, 10:05:32 PM »
You're build has made me want to show mine, same bike.  We can share notes.
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #38 on: September 01, 2015, 03:50:25 PM »
Quote from: Leekatron on August 31, 2015, 10:05:32 PM
You're build has made me want to show mine, same bike.  We can share notes.



Yes it is quit satisfying rebuilding a bike, I have just had alot of trouble with 2nd hand parts, the seller says its good but when I get it its junk, like the clutch basket I just got, not only is it rooted its for an 1987   
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #39 on: September 05, 2015, 11:22:44 AM »
Dose a 162 main jet and a 55 pilot jet sound like an ok place to start? I am in the south pacific.


The bike came with 2 old pistons and both had score marks on the front and back, needle was on the 2nd to bottom clip, but the guy had been putting new pistons in the bike with out removing the head and there was baked on carbon on the cylinder walls round all the ports.


I am going to have some stickers made for the bike from an 80s KX, I will get them resized to fit.

« Last Edit: September 06, 2015, 05:52:41 PM by SOHC »
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #40 on: September 09, 2015, 06:07:42 PM »


I just printed one out to test.
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #41 on: September 09, 2015, 06:10:26 PM »
Got a good 2nd hand crank with a rooted hotrod kit in it but I have a new Japanese prox.



this is old junk from the motor.

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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #42 on: September 09, 2015, 06:12:28 PM »
Will a head gasket from a 1992 work? it measures about 0.7 of a mm bigger uncompressed than the old compressed 1990 gasket  


« Last Edit: September 09, 2015, 06:14:43 PM by SOHC »
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #43 on: September 09, 2015, 06:33:39 PM »
I also had to make a new locator pin for the head, a peace of #8 wire was the same size


« Last Edit: October 21, 2015, 07:32:57 PM by SOHC »
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Offline SOHC

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Re: 90 KX250 rebuild
« Reply #44 on: September 09, 2015, 06:38:02 PM »
What way round dose the water pump seal go? non spring side to the water?

also here is my water pump conversion, I plan to fit a late model water pump as the old ones are hard to find, it looks like it will work with a little work. 



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