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Author Topic: Best low end-mid pipe for 98 kx250  (Read 35954 times)

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Offline Goat

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Re: Best low end-mid pipe for 98 kx250
« Reply #45 on: February 18, 2014, 02:23:16 AM »
I was thinking about going to my driveline shop and buying a couple bearings to cut apart and see what the balls weigh. BBs are a good idea as well. I have seen some in ceramic at some point but not sure what they would weigh compared to ss. Copper coated ones would probably be ok but I think those are too small in diameter. Airsoft might last for a minute but seem to be too light.

We just got another 8ish inches of snow last night. Time to bust out the kdx/quadracer with paddles n skis :P
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Quote from: Danger4u2 on June 17, 2010, 01:36:16 AM
It's hard to keep a drivers license riding a 2 stroke dirt bike on the street.  If you drive within the law they are VERY boring.

Offline Foxx4Beaver

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Re: Best low end-mid pipe for 98 kx250
« Reply #46 on: February 18, 2014, 02:37:36 AM »
Quote from: Goat on February 18, 2014, 02:23:16 AM
I was thinking about going to my driveline shop and buying a couple bearings to cut apart and see what the balls weigh. BBs are a good idea as well. I have seen some in ceramic at some point but not sure what they would weigh compared to ss. Copper coated ones would probably be ok but I think those are too small in diameter. Airsoft might last for a minute but seem to be too light.

We just got another 8ish inches of snow last night. Time to bust out the kdx/quadracer with paddles n skis :P

All good ideas/thoughts...I never thought of the ceramics, they'd probably be quite a bit on the light side compared to ss.
Just starting to flurry here.
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Offline zz3gmc

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Re: Best low end-mid pipe for 98 kx250
« Reply #47 on: February 18, 2014, 09:42:29 AM »
motopunk, 72 on the piston.
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Offline dirk_411

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Re: Best low end-mid pipe for 98 kx250
« Reply #48 on: February 18, 2014, 12:15:39 PM »
Goat. Interesting idea.  Post your findings.   I took apart a spare mechanism and the ramp is built for the 5/16" balls only.  So if a full swap is not available then I suppose I could remove material off the ramp and accommodate a larger ball.  That would be 2nd worse case.  Worse being cant make any moves
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Offline motopunk

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Re: Best low end-mid pipe for 98 kx250
« Reply #49 on: February 18, 2014, 07:27:52 PM »
Quote from: zz3gmc on February 18, 2014, 09:42:29 AM
motopunk, 72 on the piston.


ok. same size, that i also want to go ..  could the stock head gasket being modified? 

on my 360 engine, we had to made an o-ring for the outside and a copper ring on the inside.. there is very less space to the studs like you could see it in the pic. left is the 360 with 78mm bore, right is 03 250 cylinder...
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big 2 stroke bikes are weapons for real men, who don´t fear death or devil. ;O)
´83 kx250, ´87 kx250 (with 360 big bore), 87 kx500, ´93 kx500 sfc

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Offline zz3gmc

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Re: Best low end-mid pipe for 98 kx250
« Reply #50 on: February 18, 2014, 11:48:46 PM »
Cometic makes a head gasket for the BB so no modifying of head gaskets. I should have it back in about 2 weeks and Ill post up the part # for it.
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Offline motopunk

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Re: Best low end-mid pipe for 98 kx250
« Reply #51 on: February 19, 2014, 04:04:21 AM »
Quote from: zz3gmc on February 18, 2014, 11:48:46 PM
Cometic makes a head gasket for the BB so no modifying of head gaskets. I should have it back in about 2 weeks and Ill post up the part # for it.
 

great info... that would help me a lot, when i realize it..


just found this...is it the kit,that you talked from??
http://www.shopengineparts.com/parts.aspx?eid=1146&cid=48&type=model&vtype=Dirt&make=Kawasaki&model=KX250+.010%22+SS+Head+-+%2894-00%29
« Last Edit: February 19, 2014, 08:38:02 PM by motopunk »
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big 2 stroke bikes are weapons for real men, who don´t fear death or devil. ;O)
´83 kx250, ´87 kx250 (with 360 big bore), 87 kx500, ´93 kx500 sfc

---  www.der-motopunk.de.tl  ---

Offline dirk_411

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Re: Best low end-mid pipe for 98 kx250
« Reply #52 on: March 03, 2014, 12:05:16 PM »
I recieved my 99 governor mechanism.   It is larger than my T4's mechanism.  Not a direct swap.  The spring appears to be a direct swap thats about it.  Im wondering if id be further ahead to see if I can fine a more dense material than SS and juwt replace my oem 5/16" balls? 
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Offline dirk_411

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Re: Best low end-mid pipe for 98 kx250
« Reply #53 on: March 04, 2014, 01:27:42 PM »
I just ordered 4 tungsten carbide 5/16" balls grade 25.  Almost $16 apiece.  They are more than twice the weight and have great wear characteristics. 
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Offline Goat

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Re: Best low end-mid pipe for 98 kx250
« Reply #54 on: March 05, 2014, 02:19:18 PM »
Wow that's expensive. I'm curious to know how they work. I didn't realize tungsten was that much heavier.
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Quote from: Danger4u2 on June 17, 2010, 01:36:16 AM
It's hard to keep a drivers license riding a 2 stroke dirt bike on the street.  If you drive within the law they are VERY boring.

Offline dirk_411

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Re: Best low end-mid pipe for 98 kx250
« Reply #55 on: March 05, 2014, 09:49:28 PM »
When I get them I will weigh kawasaki's 5/16" & 3/8" for baseline numbers and then see where exactly the tungsten fits in.   I will have to try them with my stock spring then try the 98-99 kx250 spring and see from there
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Offline dirk_411

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Re: Best low end-mid pipe for 98 kx250
« Reply #56 on: March 13, 2014, 05:51:18 AM »
I got my 5/16" tungsten carbide balls. I weighed all 3. I didnt any precise way of weighing these.  I used my wifes digital kitchen scale.

5/16" stainless steel- 2 grams

5/16" tungsten carbide- 4 grams

3/8" stainless steel- 4 grams

So for me on my tecate 4 with the "1851" jug I think its a no brainer. Im going to run the tungsten carbide balls and oppose it with the kx250 governor spring.   I've essentially better simulated the the kx250 power valve characteristics which I feel better compliment the kx250 mod on my quad.

Now im going to see which kawasaki power sport machines use the 5/16" set up and maybe look into ramp and cup swaps.  Stay tuned
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Offline sandblaster

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Re: Best low end-mid pipe for 98 kx250
« Reply #57 on: March 13, 2014, 06:28:41 AM »
There you have it...
The weight of tungsten carbide is from 1-1/2 to 2 times the weight of carbon steel...
Nice job  8-)
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Offline Foxx4Beaver

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Re: Best low end-mid pipe for 98 kx250
« Reply #58 on: March 13, 2014, 07:02:12 AM »
cool...thanks for sharing dirk.
can I ask where you ordered the tungsten balls from?
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Offline dirk_411

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Re: Best low end-mid pipe for 98 kx250
« Reply #59 on: March 13, 2014, 07:25:08 AM »
www.precisionballs.com 1-800-322-5832

In Cali I believe.   If you have technical questions talk to Eugene. 

He told me tungsten carbide was really the only other option because of it's wear properties
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