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ok i know there is other threads on other sites about these motors, but was just wondering if anyone from here has much experience... for those who dont know they are the same as the gpx150cc and the same as the 150cc engines that come in the new atomik 150's. they claim to put out 16 Hp but...

at about 2000 rpm regardless of throtle position it just doesnt rev out any harder, it sounds like it is spluttering and strugling to get induction. under load it is compleatly gutless and if its put under to much load it just dies untill u drop it back a gear. ill check the key on the shaft...

i checked the electrical system. the resistance from the stator is fine, checked all the plugs and tried multiple cdi's and coils. so its not the electrical system. it only revs to about 2000 rpm then shits its self and will not go any harder. ill whack another top end on it and c how she...

iv got a lifan 125cc and it will not rev over about 2000rpm. the whole electrical system (stator, coil and cdi) r all sweet. I have tried 2 new mikuni carbies on it and there is no difference. it has the right amount of oil, the clearences r set properly the valves r seating right and the...

make sure the case breather pipe isnt still cable tied up. I have seen this happen heaps..

they use the same frames as what pitt boss empire used to be flogging off for around $800. so the frame and swing arm are good. everything else on it is ok as well. fair bike for the money.

was just wondering if anyone has ever fitted a 3 valve head to a 125 or 140 size bore? the 3 valve has 2 mounts from the head to the bore on one side, rather than the regular 1 on the regular heads. im in the process of making the raddest motor ever and just wondering if any one else has tried.

slugger, if u r not getting any resistance between the wires then your stator is rooted. and btw i got the resistances around the wrong way. so it should be vice versa. and yeah the kill switch is Normaly Open when the engine is running.

don't bother checking for voltage coming out of the magneto..... pull the plug from the motor out of the cdi. check the resistance between the green and black/red wire coming from the motor. the resistance should b around 350 ohms. then check the resistance between green and blue/white, it...

i have the same bike. i changed the order of the springs/washers in the 3 shoe clutch and it does make it grab a little lower in the rev range. These bikes really arnt designed for kids that are just going to be putting around on them. I never had any problems with my bike, and for the size of...

by the sounds of what you r saying i would think u have broken a tooth of your second gear. if you have i would probably have a spare gear that would fix your problem. Easiest and first thing you should do is check the internal oil filter because broken teeth usually end up in there.

make sure ya breather isnt blocked, cos if it is it causes pressure to build up in the case which can pop seals out of their seats and push oil up and into places it shouldnt be (like into the bore) i had this happen on a few bikes that came into work

HA thats the biggest crock of shit iv ever seen. it may give u a little more power somewhere through your rev range, but generally it will just make ur bike run like shit.

if u did want to get better seals that are actually capable of keeping the grease in and the dirt out try any bearing shop, because they are a standard size.

that sounds about right. Pretty much the only advantage u will get from a 200 or a 250 is that they have a 5th gear. going against a mate that had one i kept up to him on my 125 right untill he got to 5th gear.

its the one that comes off the throttle and goes into the top of the carby.

if it went for 600 or less it would b alright just becase the frame/swingarm is a copy of a good bike. the forks its running are really shit tho.