monster_energy06 Posted May 4, 2009 Report Posted May 4, 2009 ok .. last summer i semi blew my motor , the water jacket plug popped out on the pto side, overheated and i melted one ring on that piston. bike still had decent power, compression was down 160mag one side 100pto,... bottom line bike still ran good enough to whoop a 700 raptor... tore it down. put on a set of .040 over proted cylinders. i have no clue who proted these or what port work it has. they came out of a good strong running shee, that changed over to trinity stage 5 cylinders... compression was 150 both sides. bike started right up . i took her out for a quick boot to the end of my drive way and back. had good snappy power shifted 3 quick gears. parked it and called it a night. next day i take her out again.. starts right up.. go down the road up to 4th gear and droped the hammer. it pulled a bit and then started missing out on power more like popping soundon top end. took her back.did some jetting. went from 240 mains to 270.. went again. ran a lil better, but was still popping and missing out power. jetted 270 to 300 same thing again. tried lookin around found noting...... im gessing i need bigger carbs.. and that my float bowls empty out to fast..... i did try mikuni 30 mm i had kickin around with 25 pilote and 300 mains.. seemed too rich , but no miss on the power or popping. but i didnt have the right cable and carbs only opened maybe 3/4 way.. anyways ill start workin on her again, soon. any suggestions of what could be problem....?? like i said im gessing not enough gas flowing to the carb... Quote
xXBlessedWithDeathXx Posted May 4, 2009 Report Posted May 4, 2009 I would go bigger on the mains. Quote
monster_energy06 Posted May 4, 2009 Author Report Posted May 4, 2009 I would go bigger on the mains. i went up 6 sizes... 240 to 300... even tried 340's ran worst and still missed out on top. Quote
Rodneya Posted May 4, 2009 Report Posted May 4, 2009 Check the screen on your fuel valve. Sometimes they get full of crap. Also check that your gas cap is breathing right. Either of these will cut down fuel flow to the carbs. With porting and the CPIs, VF3s and pods in your profile, 340 jets may be a bit small. Quote
dragbanshee Posted May 4, 2009 Report Posted May 4, 2009 Hey energy, I was wondering what had happened to ya, hows it going? Quote
AKheathen Posted May 4, 2009 Report Posted May 4, 2009 you may also be getting weak spark. check the gap on your pickup, and the gap on the plugs, and make sure it's getting good blue spark. then do a plug chop to check the jetting Quote
monster_energy06 Posted May 4, 2009 Author Report Posted May 4, 2009 (edited) Check the screen on your fuel valve. Sometimes they get full of crap. Also check that your gas cap is breathing right. Either of these will cut down fuel flow to the carbs. did that twice .. seems to flow nice.. might need a pingle tho. With porting and the CPIs, VF3s and pods in your profile, 340 jets may be a bit small. im running pro circuit pipes . also reed spacers, cool head 21cc domes, 3* key(took it out and still the same ) been running 240's since day one with these mods, never had a problem with stock jugs stock carbs. plug chop was perfect... Hey energy, I was wondering what had happened to ya, hows it going? not to bad, tx. been really busy over the winter with my sled, and also workin on my new f150 to get more juice out of it. also work and all that crap lol but im back and tryin to get her ripping again you may also be getting weak spark. check the gap on your pickup, and the gap on the plugs, and make sure it's getting good blue spark. then do a plug chop to check the jetting did that also even replaced the caps , mag and pick up is good , i did switch over to diff electrical ... still nothing there... soo im stumped Edited May 4, 2009 by monster_energy06 Quote
toolucky Posted May 4, 2009 Report Posted May 4, 2009 im running pro circuit pipes . also reed spacers, cool head 21cc domes, 3* key(took it out and still the same ) been running 240's since day one with these mods, never had a problem with stock jugs stock carbs. plug chop was perfect... not to bad, tx. been really busy over the winter with my sled, and also workin on my new f150 to get more juice out of it. also work and all that crap lol but im back and tryin to get her ripping again did that also even replaced the caps , mag and pick up is good , i did switch over to diff electrical ... still nothing there... soo im stumped do a leak down test Quote
AKheathen Posted May 4, 2009 Report Posted May 4, 2009 did you do a leak down and retorque the head yet? which side are the reed spacers on? Quote
monster_energy06 Posted May 5, 2009 Author Report Posted May 5, 2009 do a leak down test yaa ill try that wen i get back did you do a leak down and retorque the head yet? which side are the reed spacers on? head was re-torqued, spacer in-between reed cage and cylinder Quote
mopar1rules Posted May 5, 2009 Report Posted May 5, 2009 i had a similar issue when i tried running reed spacers. it killed my top end. it would gurgle/stumble and such. removed reed spacers and then it ran great. i hate reed spacers. try taking them out and see what happens. Quote
AKheathen Posted May 6, 2009 Report Posted May 6, 2009 reed spacers on the cylinder side baisically short circut the transfers at higher rpm's. you want as little airspace as possible between the reeds and transfers. Quote
extreem9 Posted May 7, 2009 Report Posted May 7, 2009 reed spacers on the cylinder side baisically short circut the transfers at higher rpm's. you want as little airspace as possible between the reeds and transfers. Is that so? wow I just put in reed spacers I guess i will be taking them back out, has everybody had this problem with reed spacers. i have never heard of that. I havent taken it out yet so i havent noticed anything(yet) Quote
monster_energy06 Posted May 8, 2009 Author Report Posted May 8, 2009 (edited) i had a similar issue when i tried running reed spacers. it killed my top end. it would gurgle/stumble and such. removed reed spacers and then it ran great. i hate reed spacers. try taking them out and see what happens. yaa ill try it and see maybe its acting up with the porting but highly dought it... never herd of this befor.. unless gaskets werent used reed spacers on the cylinder side baisically short circut the transfers at higher rpm's. you want as little airspace as possible between the reeds and transfers. thought they were made for more velocity befor air gas mix enter the tranfers..... haha also to clear bigger carbs Edited May 8, 2009 by monster_energy06 Quote
dajogejr Posted May 8, 2009 Report Posted May 8, 2009 Leak down test as said, then start looking electrical. Quote
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