Maintenance & Technical > KX250 / KX125
Best low end-mid pipe for 98 kx250
dirk_411:
Doldguy, 5mm on the tecate crank. I dont originally build these motors. I dont have the the skill per say or the proper resources. I can rebuild them myself.
That being said. The motor your looking at has the kx crank grafted into it to match the jug. The pipe is dyno made for that motor. ILR performance out in Wa. The reason I am doing a new motor all stem from the desire to have a cool head. Phat head. So after reading I decided to commit to the "1851" jug. Bought 5 of them all with PV's and 3 additional sets of new power valves. That ultimately was the reason I wanted to convert to a kx250 jug. The tecate power valves were brittle and not available.
Sounds like this motor is going to have some low end grunt by design from what you say. Perfect. I wonder if I should go for a mid-top pipe?. I run a pvl and the pulse induction system that's in the K5 threads.
Im really looking forward to the new motor. I may not have it for this summer, unsure yet. Here's a run down on whats going into it.
T4 lower end 6 speed
1851 jug, 310cc, port and polish, phat head running 50/50 blend of vp110 and 91 pump fuel
Tranny is under cut by fast by gast, NOS input and output shafts
Complete tranny and anything steel pertaining to shifting, power valve, counter balance, kick start and even the back gear off the clutch basket is gone to CV products for micro polish
Pvl ignition
K5 hinson clutch basket
Pulse induction fuel intake
Im anticipating a fun bike. My quad in the picks waxes that other T4 and im 80lbs heavier body wise than my buddy
Not to mention that ltr450 geometry with them 17" elka stage 5's. Will be 50". No problem for trail riding here. Going to be golden
That front end in the pics is the +3 set up using 08 yfz450 take offs and outfited with 16" dual rate fox's. I kept my hardkor front hubs, gafler rotors for these new lsr spindles. Original T4 shocks were 14" and s**tty single piston calipers to boot. Upgraded to custom +2 steering stem that is oversized and integrated the 250r 4 bolt frame clamp, kfx450r walsh lower bearing, precision pro model steering stabilizer and precision shock n vibe bar mounts that hold renthal fat bars. Dynamite, threw in the fasst co brass bar inserts and reduced feedback ro the hands dramatically. Bring on the stumps and rocks. The new spindles shorten up my tie rods by 1 3/4" per side. I think that will even improve feed back.
I just hyjacked my own post. Anyways fun to see a couple of yahs interested. Id have a tough time naming 10 people that are as deep into there kawasaki tecate 4 as me. Id bet the farm on it
dirk_411:
--- Quote from: Goat on February 13, 2014, 06:56:31 AM ---Those are some pretty quads. I am super jealous now. Cases anodized or is that blue chrome or some fancy paint? What pipe is on there now?
--- End quote ---
Thanks goat. Me and my best friend really enjoy these old 2 smokers. We were both born in 81. They are so rare. And furthermore we are in canada. Ive bought everyone ive ever seen (5) up here. Payed a lot of money to couriers to cart me up parts from the USA over the years. Only thing i use from the original T4's are oem palstics, frames and lower ends. Everything else is hybrid. I was 16 when I bought the first one. Blue paint. Fairly fresh there. Eluded to pipe in last post.
dirk_411:
--- Quote from: zz3gmc on February 13, 2014, 09:37:24 AM ---Im building a big bore 04 KX250,290cc. In 250 form I ran a Enduro Engineering pipe which worked well across the board. Its a pretty rare pipe, seems like they only made them briefly. Ive also used a Gnarly, good low and mid but signed off a bit early. The stock pipe worked well also. What pipe would you recommend with the 290? I have a never used Pro Circuit Works pipe and have been thinking that it would work well. They seem to be a mid to top oriented pipe. Im not new here Im the Flyin Hawaiian. Ive been having trouble getting on the site so I made a new acct. up.
--- End quote ---
Hey flyin Hawaiian. I was told to ask you about my power valves governor spring. Im running the 98-99 jug. I was wondering if I should try to swap my stock T4's spring for the 98-99 spring? Any thoughts?
Goat:
Since you're running the kx top end I would imagine upgrading the spring would make it a bit snappier. Especially since the t4 spring is probably from the factory when it was new :P
I'm now looking for a T4 to buy lol thanks for that :P I may even leave the 250 in it since I have the quadracer with a kx500 in it already.
zz3gmc:
Im not sure of the diameter of the T4 spring versus the 98/99 spring. I have some powervalve governor shims that I used in my 90 KX250 and they wouldnt fit my 04 gov. I cant remember if it was the diameter of the shaft or the spring itself. Im thinking that the spring from the 90/91 KX and your T4 might be comparable in size since the engines changed in 92 and went on to 04.
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