01 Cr125 WINTER PROJECT NEED HELP

[cr125freak]

I know the pilot needs to go to mabe a 46 (45 now) but no big problem. Im at a 460 and it is running pretty good just the needle jet? Do you mean adjusting the clip? Once again excuse me im 15 and wanting to learn so I will not get things confused

 

[cr125freak]

Ok here is what i got. I just tinkered with it. When i was it to mess with the carb it obviously cools down the engine. Ok the first say 3 minutes it runs great i meann really hauls. Then when it warms up after 3/4 throttle it falls and almost misfires

 

[cr125freak]

not misfires just falls on itself

 

[procircuitdudecr26]

Try richer on the main jet

 

[cr125freak]

will do
can anyone explain y he said that

 

[2-strokes-4-life]

what i gather is if the main is to small your bike will not be receiving enough fuel at high rpm,which will cause you to lose power on top.i could be wrong,just info i've gathered from reading and researching.actually i have the same bike and i am about to install my top end in 2 days or so. i will also be working with my jetting.i on the other hand am having an off idle bog prob as in if i let the rpm's drop really low then whack the throttle wide open it will want to die unless i back off.

 

[cr125freak]

Yeah thats what I was thinking . Found out part of the problem, I had the head milled and it didnt hold the pressure and the gasket didnt hold, Small amount of coolant was coming out. Which kinda gives me a second hope though. And mabe im not as confused in jetting as i thought i was

 

[cr125freak]

ok i fixed the head problem but it is still doing it any ideas

 

[cr125freak]

I am just going to take er to the shop im tired of riding a 125 that feels like a 100 fourstroke

 

[cr125freak]

ok,, its at the shop and they have no clue whats wrong
..... could it be that im running avgas

 

[Badgadjit1]

BUY A TORQUE WRENCH!!! find a cheap one, or find someone and borrow one......i have broken head bolts and have read tons of post on here from people asking how to get broken bolts out..its one of the best investments in my opinion when you do a lot of your own work. you don't need to get the best just get one that works and get a good one later..sooner or later you'll be wishing you had one.

 

[2-strokes-4-life]

stock jets:380 main,45 pilot,6BEG20-68 needle with clip in the third groove from the top. air screw at 2 1/4 turns out.i will read up on the rc valve for you in alittle bit and post back.i believe as long as its installed correctly there is no timing procedure for it,just make sure it opens and closes correctly by hand befor you install the cylinder

 

[cr125freak]

thanks please get back to me on that.... Any ideas if avgas will make it run this bad i have already read the post rick made.

 

[cr125freak]

yeah the shop said it was the avgas that made it run so horrible

 

[towlie]

I don't have a decent torque wrench either but I use 20 arm pounds on the cylinder bolts on my 02'. I use loc-tite also.

 

[cr125freak]

well the bike is runnig great at this point. It hauls... ide say the winter project is finished except the clutch... in the future ide like it ported and polished

 

[DaRooster]

hey cr125freak, I've got the same bike. Just a few quick questions of what you're running because I also live in Ohio and with weather and humidity pretty much the same figured I'd just ask. What premix you running? And as far as jet sizes and clip position on the needle where you at? I basically had same symptoms you had. 1/2 to full throttle, fall flat on its face. Found I was too rich, fouling plugs.... so made adjustments and is running a hell of a lot better, but I know I can squeeze a little more out of her. Just had a rebuild over the winter and has not been at its total potential yet.

Thanks,
Chad

 

[J1mMy]

Quote"I am 13 years old and I used a cresent wrench to tighten the cylinder down to the cases,Squeeze the ring with your finger and put the cylinder on at the same time but do not twist it on there."



Weren't you ever told cresents are only for crap bikes and big wheel nuts when you dont have a big enough socket/spanner for :laugh: :laugh: :laugh:

 

[cr125freak]

380 main, 3rd clip postiton... Castrol 927 premix at 40:1... I have a fmf rev pipe boyeseen reeds and the head milled by eric gorr for high rpm.. (just head not ported and polished,, $30)