i found this earlier on my bike, a hole underneath where the crankcases meet as it looks like its been cut out,is it ment be there?

http://s1079.photobu.../w508/matyboy1/

if i am honest with you i have no idea but aslong as it isnt leaking then i wouldnt be too botherd about it, hows your bike running, good or bad?

_{its not leaking,i had a look on the net at some engines and it was there so nothing to worry about i hope.as for running still same problem still wont rev up to 12000rpm,reving to about 9000 since ive cleaned the carb,better that 6500 i supose}

when you get to the maximun revs does it sound like its bogging and losing power, about to die?

its got power ,if you hold it there it will splutter let go of the throttle and it will pick up again untill it gets to that point

yeah it seems to me to be somthing with your carb, do you know if the main jet is the right one? have a read through this mate,

OR it could be that you have mixed too much 2 stroke oil with petrol, do you mix it yourself then add it to your tank or does your model have separate 2stroke tank??

im unsure what size jets in it at the mo mate ill check standard jet is a 210 going by that thread,the bike has a big one exhaust on it so i dont no if id have to upjet or not.as for the oil it a seperate tank

Yes,the hole in bottom of engine is meant to be there.

If your bike is a DTR then you have a 210 main jet.

If you have a standard exhaust (not silencer) then 9000 rpm is good and probably max you can get.

The engine is boging out at 9000 rpm because it has reached its full breathing capassity,,,,,,air in and exhaust out.

The red line starts at 10500 rpm BUT,,,,, and this is a biggy,,,,, if you hold your bike up at these revs for long periods of time then you are going to kill your engine,,,,,, so 9000rpm is good and your engine will last longer.

ive been told its either a 210 or 240 main jet if its an import or something,my clocks are in kph does that mean its an import?

yes it does of course, wanna buy a kph to mph converter i have a new one for sale...pm me if youre interested

my import had a 240 and i fitted a 250 with a non standard carb and airbox