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"E.C." 2 Cycle Engine "TRIX"

Oh Hell !!!...

Another "E.C" Trick...

By just" E.C." :-)>

 

Oh Hell !!!... Another "E.C" Trick...
 
I would dare to say that 90% of you that are Bike Riders and never Looked into Racing a Go-Kart... In short to you a Go-Kart is something you got the Kids to ride in the back yard and piss off the neighbors from the noise... Well if you think that is all a Go-Kart is then click on this link and see what a 100 plus MPH looks and sounds like... http://www.youtube.com/watch?v=ry0oUGELp6U
 
Now I also write short post for this web forum  http://karting.4cycle.com/showthread.php?t=380114 ... drop in and you will read all the post that is the top part of this article... While there surf around a bit to the other forums and threads, will be fun and who knows just may learn something that will help you in your line of sport also...
 
In short Go-Kart Drivers Range all the way from 6 year old to Old timers and those that drive these 60 plus HP and turn well into the 20 thousand RPM numbers for the most part come from a day in the past when Dirt Racing was their thing...
 
Bottom line some of them found out that falling off and healing up slow just wasn't what they wanted to do any more...So they use that Bike now for a fun week end of fun riding; but not ready to hang up their Helmet and Leathers and turned to Go-Karts for their need of speed... And as you can tell from the start and the clips I used to start this article some of these guy's have been around the block more then one time... In short they know 2/cycle engines in and out and far more then the average Motorcycle Rider because 90% of them do their on Engine Building and take care of their ride day and night just looking for that next 10th of a second...       
 
ole4 ole4 is offline
Georgetown, TX.
 
Re: Help with yz 250 shifter engine
  
thanks all for the information. I just found out going thru the service manual that 89 was the last year of a Iron liner starting in 90 they went to plated aluminum. So this cylinder can be honed and bored oversize although it came with a new Weisco piston in it.
 
Dickson, Tn.
 
Make sure has plenty of clearance... {Wiseco piston in it.} ... These are El-Stick-O Pistons...
just "E.C." :-)>
  
Millerstown, PA.
 
This is true we run a bigger clearance with the weisco than an other piston. I usually run a Pro X guys say the Pro x has a larger failer percentage that the weisco though. The pro x does not swell up near as much as a wiesco when the motor warms up. You with also most likely need to run more clearance than what the owners manual says due to running more RPM's for longer time period. This makes them run hotter than in a bike, not to mention more load on a kart that a bike.
 
Dickson, Tn.
 
What kind of oil ??? Wiseco,, I'd go in with ..005... UP 2 STEPS on main jet... Ride for 30 min... Shut down and let get cold... Pull Cylinder off and check for any shinny spots... If there is remove with file... On 45 degree strokes... Don't worry about any scratches... Leave them there to trap oil... Never touch a piston with any kind of sand paper... This will leave grit in piston alloy you can not remove in full and will "Kill" cylinder bore...
just "E.C."
Jon Brogden Jon Brogden is online now
Dickson, Tn.
 
I set my 89 WR 250 up with a Wiseco at .0035 piston to clyinder clearance with no issues from being too tight. When I ride it, it's not for a 15 minute moto it gets pushed hard for 30 or 45 minutes, then usually one of my boys gets on it and whips it some more . Weisco's have changed a little over the years, there not thick as a brick and weighing in at 5 lbs any more. You have two overbores in that cyl with factory pistons the biggest one being only .020 over, then your on to installing a sleeve and doing a slight modification to the power valve. Once you do that though you've got like six overbores useing the Wiseco line. It can last a long time. Jon
 
Georgetown, TX.
 
Thanks for the information gentlemen this is what makes this site so great!!!
 
Arizona
 
What works on mx bike engines does not always equate to what a kart engine needs..
Due to the large cooling fins and watercooling of a kart engine, they require, more clearance for a forged piston.
It is also how you break them in..
Myself, I like a bit more starting clearance, and to break in, with several heat cycles. I don't worry about the ring seating, as it will on its own. I like the piston to take a set, and stop growing..
If you start with a lower clearance, you will end up running the breakin for a longer time, and may half to file your piston as EC suggests..

Everyone has their own way of doing things, but I have never taken a file to a piston..
 
Dickson, Tn.
 
Azrcr...
I've looked at your work, and the info you have put on here to help others as I DO respect what you say...

I think you know and understand why I said never touch the sides of the piston and just a file... Well I was feeling bad that night and short cut-ed and should have explained my reason deeper...

In fact the type of file is even important... What you need in your screw up fix it box is 6.000 maybe 8.000 long 3/4 wide flat Wood Rasp flat file... those little nasty sharp teeth slide over the piston on 45 degrees makes neat little diamond shaped boxes,,, Now these become little pockets to catch and trap oil which will turn into carbon spots which is the perfect bearing surface... I have raced all over that Desert you have and 1000's of miles of Desert Racing... All of the Desert bikes were purposely set up a bit on the tight side so it would make and show those tight spots... Then hand babied with the file treatment... After done and ran in this way It was good for the Mint 400 across Nevada,,,Or just a 200 mile short race in your Desert... As you say, each to his own is cool as long as it works for you... But I can say in 10 plus years of Desert Racing I never stuck a Engine...
just "E.C." :-)>
 
Augusto Augusto is offline
Loja, Ecuador, South America
 
I have done that diamond pattern on the skirts with a Swiss army knife to get back to life worn out pistons, and I have won races that way, also the ice pick trick that you E.C. told me has worked great all the time, I believe the oil pockets help sealing a lot, the engines have very good compression, don't last much but just enough. I have never stuck a piston treated this way.
 
Arizona
 
E.C, no disrespect meant, I remember you back in my early days of mx'ing, and I know you have a old legacy, and I don't dispute how you worked your engines.. We tried some weird stuff on the Carabella's, Taco's, Pentons.. from knurrling pistons, to taper cutting, to hard chrome bores, head water cooling, intake reeds, etc..

I only made the above statement, to possibly remind people that technology has advanced as the materials have..
 
Now For the Last Act... and
The "Speed Secrets" for a Longer Life of your Piston for Racing or Just that Week End of Fun Riding... 
 
ALL the above information is good and worth you study time... But now lets get down to the Seed Secrets I have never put into print till today that was my ACE in the hole to get the Business Done of "Winning" and longer life of my two/stroke Engines; and now yours for a little effort put fourth...
 
Now that box we called screw up fix it box... Well we just changed the name of it to My box of Trick Piston Tools... And done this way we should be-able to leave the Fix Screw up Off THE LABEL...
 
Now to do what I'm going to tell you we need some more tools to go in that Box of Trick Piston Tools and you will have to Buy, Beg, Barrow or steal from a Buddy that has them... By the way the last way to get needed tools here posted, could lead to get fingers broke, or maybe shot....
 
Ok Lets go shopping ... Turn the computer on, and bring up the internet, and dig out that credit card... All we need you will find there and that will save that $4.00 plus a gal. for gas for the bike and not driving a Zillion miles looking for them...
 
Starting off we need one 6.000 Venire Calipers, a small set of feeler gauges, .0001 to .025 is big enough, one very sharp pointed ice pick.  One .040 drill bit, one 1/8 inch straight carbide burr, one 3/4 Carbide Ball with 1/4 shank porting burr, your flat wood rasp file, one fine tooth flat file, one chain saw sharping 1/4 inch round file... Hell, these are cheap get you a set from 1/2 inch to 1/8 size... Once you have them you won't know how you ever got by without them... One black felt marker, one each small can of Fell-Pro 360,600, and 1000 grit...
Now go to the local Head Stone Making place and get you 2 flat ground slabs of granite stone scrap... At least 10X10 or bigger... 1.000 inch or thicker is fine... Will be cheap and may just give to you to hall off... One roll of 1.000 wide masking tape, one tube of Simichrome Polish, 4 or 5 UPS or Fed X overnight letter holders...I prefer Fed X their faster... One bottle of Simple Green, barrow Grandpa's tooth brush for scrubbing his false teeth, 1qt. of ATF, and must be GM type, some ATF's for Fords has metal in it and not cool for our usage so don't get that... We also need a couple of rolls of white paper towels,,, no white, no colors or flowers on it, 6 pack of suds, not, better make that a roll of Rolaids... Food for writers or mechanics with a problem beyond them...  
 
Time for a break and a potty stop, yes frig has cols suds in it I'll have one of them to... Back to read and study time for you and me pound on this key boad some more... If things are getting fuzzy to you, no that not a sign you haa to many sudsmaybe... It's me because I'm using Bubba juice as a chaser for my suds... But for here on out I will type slow for you that read slow can keep up with me...
 
Ok not a must for sure, but I assume that you have a shop, well lets say you parked Wife's car out on the street and the part of where her car was setting you have turned into your own Bike shop... If your Truck that use to be setting in it's place and been moved out side also that means Bikes and machining tools have taken up that area with like a end-mill, drill press, lathe, tig welder, belt sander, bench grinders and a wide view TV so you can watch the Races and work on bike at same time...  That's all to the good; but if you don't have all these toy's to play with well we will still getter-done...
 
This is enough for one day, I'm fried and you have shopping to do... By the time my Brain Cells heal up from getting this far I'll be ready to do part #2... 
 
just "E.C."  has left the building.. :-)>