Posts
1257
Joined
11/27/2012
Location
Sundsvall
SE
Edited Date/Time
9/14/2013 12:22am
Hi!
Thought it was time to post my bike up here and ask som questions at the same time.
CR155 02
Engine:
*02 bottom end
*SRS racing 1th gearbox sprocket
*Eric Gorr stroker 58.5mm
*99 HPP valve Eric Gorr Cylinder 58mm mid/top porting
*Milled cases to clear the stroker crank/ rod (not the piston skirt)
*99 Eric Gorr head for racegas
*GMX radiators
Air/Fuel
*Boyesen radvalve.
*38mm YZ125 carb
*07 cr125 airboot
*Run 50/50 Shell Vpower/100LL fuel
*Twinair filter/alu cage
Ignition:
*01 CR 125 strator/flywheel
*01 Pro circuit/JD cdi box (stock PC curves)
Exhaust:
*02-03 cr125 Pro circuit works pipe.
*02-07 cr125 Pro circuit R304 shorty
Suspension:
*Kayaba Forks, coated and modified by Mansson suspension, swedens Enzo techninca guy.
*Kayaba A kit works shock.
Brakes/Wheels:
*Motomaster oversize front
*Stock rear
*Excell/HAAN A60 whels
Clamps/Bar:
*Twinwall 997
*Sunline clutchperch
*Stock clamps
Plastics/Graphics:
*Ufo plastic
*Cycra front plate
*TJ Retro kit.
So about the bike, im not super impressed with how it runs, when i search allt the forums, 99.99% are pretty happy with Eric's engine works, but i think my bike would be stronger than what it is at the moment.
It feels kind of flat, pretty mellow on top (i know it will be a bit shorter powerband with the stroker, but it feels so weak down low to) the stock -12 KTM sx125 outperforms my 155 bigtime down low.
But after xmas/new year i will get the bike up on the dyno and get it properly jetted and a new igition curve for the 155cc kit insteat of the 125cc kurve i've got now, but im looking for somee more mods to the bike before i go there.
So.. som questions then..
1: Exhaust? i don't think the PC set-up is the ultimate so im looking in the DEP 144cc pipe, but they only make those for 05-07 so im gonna borrow a 06 stock pipe from a friend and see how far off it is and how much work it would be to get it to bolt on.
2: Exhaust nr2.. i saw something in a couple of threads in different US based forums that some guys run KX 125cc pipes? does anyone got a picture of the kx pipe mounted up on the bike? or more info then "i've made it fit with my gigat hammer"
im banging my head against the wall on what i should do to get some more speed out of the bike (please, no pictures of 500cc engines or "buy a 250cc" i got both of them in the garage allready) but im a bit curious on the KX setup, and if i go that way it will probebly be a HGS or DEP KX 144cc pipe
3: My airbox is still undrilled, but i will get to that before the dyno time.
4: Reedspacer? god or shit?
Any inputs/good advices on the build? Got somee more parts incoming that i will post when i get them,
Sorry for my bad english.
//Jesse Westerlund - Sweden
Thought it was time to post my bike up here and ask som questions at the same time.
CR155 02
Engine:
*02 bottom end
*SRS racing 1th gearbox sprocket
*Eric Gorr stroker 58.5mm
*99 HPP valve Eric Gorr Cylinder 58mm mid/top porting
*Milled cases to clear the stroker crank/ rod (not the piston skirt)
*99 Eric Gorr head for racegas
*GMX radiators
Air/Fuel
*Boyesen radvalve.
*38mm YZ125 carb
*07 cr125 airboot
*Run 50/50 Shell Vpower/100LL fuel
*Twinair filter/alu cage
Ignition:
*01 CR 125 strator/flywheel
*01 Pro circuit/JD cdi box (stock PC curves)
Exhaust:
*02-03 cr125 Pro circuit works pipe.
*02-07 cr125 Pro circuit R304 shorty
Suspension:
*Kayaba Forks, coated and modified by Mansson suspension, swedens Enzo techninca guy.
*Kayaba A kit works shock.
Brakes/Wheels:
*Motomaster oversize front
*Stock rear
*Excell/HAAN A60 whels
Clamps/Bar:
*Twinwall 997
*Sunline clutchperch
*Stock clamps
Plastics/Graphics:
*Ufo plastic
*Cycra front plate
*TJ Retro kit.
So about the bike, im not super impressed with how it runs, when i search allt the forums, 99.99% are pretty happy with Eric's engine works, but i think my bike would be stronger than what it is at the moment.
It feels kind of flat, pretty mellow on top (i know it will be a bit shorter powerband with the stroker, but it feels so weak down low to) the stock -12 KTM sx125 outperforms my 155 bigtime down low.
But after xmas/new year i will get the bike up on the dyno and get it properly jetted and a new igition curve for the 155cc kit insteat of the 125cc kurve i've got now, but im looking for somee more mods to the bike before i go there.
So.. som questions then..
1: Exhaust? i don't think the PC set-up is the ultimate so im looking in the DEP 144cc pipe, but they only make those for 05-07 so im gonna borrow a 06 stock pipe from a friend and see how far off it is and how much work it would be to get it to bolt on.
2: Exhaust nr2.. i saw something in a couple of threads in different US based forums that some guys run KX 125cc pipes? does anyone got a picture of the kx pipe mounted up on the bike? or more info then "i've made it fit with my gigat hammer"
im banging my head against the wall on what i should do to get some more speed out of the bike (please, no pictures of 500cc engines or "buy a 250cc" i got both of them in the garage allready) but im a bit curious on the KX setup, and if i go that way it will probebly be a HGS or DEP KX 144cc pipe
3: My airbox is still undrilled, but i will get to that before the dyno time.
4: Reedspacer? god or shit?
Any inputs/good advices on the build? Got somee more parts incoming that i will post when i get them,
Sorry for my bad english.
//Jesse Westerlund - Sweden
By the way my guy does.
www.tdc2strokeperformance.com
PS those "kits" aren't all they're cracked up to be, from any builder.
I also got a reply from HGS that they have a cr144 02-04 pipe but it's a special order and it's not in their regular parts catalog.
So i will turn to my swedish HGS distrubitor and order a pipe from them.
The Shop
I am considering getting the 144 treatment on my 04 YZ125. But I want something that I can run half pump and half race gas. I don't want to have to run straight race if I can get around it. I don't make many changes to my bike right now as far as jetting goes just because it runs so crisp in the winter or summer months, but I would like more power through all the RPM range. I ride mainly moto but I also will ride trails and offroad stuff. I have heard horror stories of jetting issues and trying to get their bikes to run right.
Also, if I go with TDC what do they recommend as far as pipe and silencer combo and brand of replacement top end kit? I checked their website out and they didn't have any recommendations for that stuff as far as I could tell.
The cool think with TDC is he can set up cylinder heads 10 different ways to better suit track conditions and your riding style. And of course what octane you plan on running, everything is run through computer programs that tell him where things need to be and he machines it up.
And then the bullshit will stop with other builders "claiming" their hp numbers, Brent will dyno the motor (you get the sheet) and have it setup to put in the bike and race.
Brent is a motor builder not a website designer he cares more about strong motors and happy customers than a flashy website. He's also on facebook.
http://www.facebook.com/TDC2StrokePerformance?ref=ts&fref=ts
Thanks man.
The work was originaly done by Racetech in Holland 02 (this bike is a former GP bike from Care/Donjoy Honda in Holland, so the coating etc was done by them.
Then Månsson rewalved it for me 2010, but the springs are to soft for me.
I bought the new KYB rear shock two weeks ago from a guy in gothenburg, but i also have a KYB A kit fork that in trying to buy with the right springrate.
We got a 03 cr500af that will get my current suspension if i can get the KYB parts for the 155cc
That is why i run the 99 cylinder/head combo cuz you can bore them to 58mm (144cc) instead of 134cc (00-04 cylinder)
I had to mill the bottom of my cases due to the stroker crank, so 144cc big bore did not require any case work for me.
But you can fit the old HPP cylinder on the 00-02 cases along with the older powervalve guvernuor or what you guys now call it (the thing that controls the valves down in the engine cases, hope you understand my bad english :/
Pit Row
Cant WAIT to get it on the bike now!
Any thougts?
Just to be sure, did you measure the piston to head clearance at TDC(correct) or how deep the squish band is cut into the head(incorrect)?
I've also contacted HGS exhaust in the Neatherlands and they told me that they have a 144cc pipe for 02-04 Cr125 but you have to custom order it from your HGS dealer, so i will probebly run a HGS exhaust.
Im thinking on trying a new silencer to, the 304R seams to gice it a bit short powerband.
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