no only to see what do with not filter.. i have filter always..

I've got the air filter out and it goes faster...that's mean that i need a bigger jet right??

this is what i do.. the exhaust has 4-5 holes very small... i will clean the carb.. now with 150 main jet i put out the filter and it is gone better.. i think that the main jet needs more than 150..

I have good news! :D I tried my friend's carb and exhaust and now mine reach top speed at 350m and stumbles only at 5th or 6th gear a little bit... Should i change to lower or higher jet...??

no only the jet i clean..thanks for all.. i will try and i will post again to say..

I had jet 145 and it was white so i changed...Now i have 160 with the needle up cause at middle stumbles and cant work at all...I wait 158 to arrive and i will try mixing at tank to check if oil pump works well.

Hmm nope :/... piston is at very good condition...I have never "opened" the hole engine only cylinder to check piston cylinder conrod and cranksaft and they are ok.Reed and intake also ok.I have cleaned the jet and i ordered a new one 158 and waiting to arive to try it.

1) What do u mean??A different gearbox?? 2) We've checked this :) 3) Chain and sprockets are ok!How can i check gearbox?? 4)I've tried 150 jet but then it goes worst :/ i'll try 158. 5)New and clean! :) 6)How can i check this..? 7)We've checked it and seems ok. 8)I have fmf power core 2 and my frien...

Hello. I have a crm mk3 motard. 160 jet 14-42 with fmf gold series. At 1st-2nd-3rd gear it goes really fast and good but at 4th-5th-6th slows down a little bit and stumbles. A friend has mk3 motard with 150 jet fmf gold series and goes really good at all gears. I tried his jet but then mine goes wor...