AxesOfEvil_96 Posted July 24, 2015 Report Share Posted July 24, 2015 (edited) Hey guys having a hard time getting my new carbs dialed in. With stock carbs I was running 350 mains, 30 pilots, air screw 2 1/4 turns out and it always ran great. Put VForce 4s in and had a bog/hesitation around half throttle. Found a good deal on Keihin 28mm PWKs. Rich off idle and still has the stumble in the midrange. Cleans up great on top no sputtering. Plugs are pretty dark and a little wet. Started with 158 mains went down to 155 and now on 150s and still rich. Running a 45 pilot (only one came with cabrs) air screws 1.5 turns out. Stock needles middle clip position. Mods are - FMF SST HJR Aggressive trail port with boost ports VForce 4 reeds Stock head milled .030 .030 over bore Stock stroke HotRods crank Lightened flywheel Clutch 28mm PWK Pro Design Pro Flow filter kit (investing in pods when I have extra cash) Just under 1000ft sea level here in Ohio Im going on a riding trip in two days and would love to be able to ride my Banshee. I can take my YZ250 as backup but I don't wanna ride a MX bike in trails/hills if I don't have to. Any help is appreciated! Thanks Edited July 24, 2015 by AxesOfEvil_96 Quote Link to comment Share on other sites More sharing options...
Coupelx Posted July 24, 2015 Report Share Posted July 24, 2015 I bet you will end up around a 140-145 main and a 40 pilot. edit: also try a jjh needle. made a world of difference on mine vs the stock (n68a?) needles. Quote Link to comment Share on other sites More sharing options...
AxesOfEvil_96 Posted July 24, 2015 Author Report Share Posted July 24, 2015 Okay I think the smallest main I have is a 148. I thought about trying to change clip position to lean out the midrange some with the stock needles. From what I've read people really seem to like the jjh needles Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted July 24, 2015 Report Share Posted July 24, 2015 I think your main is damn close , def try the jjh needle and bump that pilot up to a 50-52 Quote Link to comment Share on other sites More sharing options...
AxesOfEvil_96 Posted July 24, 2015 Author Report Share Posted July 24, 2015 Bigger pilot? Come to think of it it might have come with a 50 also. I'd have to double check Quote Link to comment Share on other sites More sharing options...
rjayb Posted July 26, 2015 Report Share Posted July 26, 2015 My 421 serval runs 142m 52p needle 4th position 3/4 out on screw with 28s at sea level Sent from my SM-G900V using Tapatalk Quote Link to comment Share on other sites More sharing options...
AxesOfEvil_96 Posted July 28, 2015 Author Report Share Posted July 28, 2015 I ordered the JJH needles , 145 & 140 main. 40 pilot. Should arrive in a few days. Im excited to try them out Quote Link to comment Share on other sites More sharing options...
rjayb Posted July 29, 2015 Report Share Posted July 29, 2015 I'm running the same needles. 40p sounds pretty small. Sent from my SM-G900V using Tapatalk Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted July 29, 2015 Report Share Posted July 29, 2015 If you said it ran good up top with a 158 why would you keep leaning the main out for s midrange problem . My suggestion would be do a proper plug chop and learn what range each adjustment effects Quote Link to comment Share on other sites More sharing options...
AxesOfEvil_96 Posted July 29, 2015 Author Report Share Posted July 29, 2015 The local shop closed up and Im not cutting up a $8 spark plug. Quote Link to comment Share on other sites More sharing options...
Burke Posted July 29, 2015 Report Share Posted July 29, 2015 There ya go... save your plugs, but risk burning down a motor. and aren't plugs like $1.75 each? Edit: even cheaper than that... http://www.iboats.com/Spark-Plug-BR8ES-SOLID-NGK/dm/view_id.197036?cm_mmc=Google_Main-_-Mall+Product+Listings%3AGoogle-_-+%3AMall+Product+Listings%3AGoogle-_-NGK&mkwid=sKGfDMeys&crid=41829038899&mp_kw=&mp_mt=&pdv=c&gclid=Cj0KEQjw8-GtBRCMl7m54PzgjNQBEiQAIZckv00yjRidUpfTQzDFCVb7YSaDCpp7D-lWiOg9pB_pwU8aAhE38P8HAQ Quote Link to comment Share on other sites More sharing options...
AxesOfEvil_96 Posted July 31, 2015 Author Report Share Posted July 31, 2015 Yeah Im gonna burn it up while its too rich. Makes sense Quote Link to comment Share on other sites More sharing options...
Ron Burgandy Posted August 1, 2015 Report Share Posted August 1, 2015 Looks like Burke's a little burnt Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Burke Posted August 1, 2015 Report Share Posted August 1, 2015 You're making big jumps in jetting... It doesn't take long to melt a piston... Have at it Quote Link to comment Share on other sites More sharing options...
Coupelx Posted August 1, 2015 Report Share Posted August 1, 2015 Yeah Im gonna burn it up while its too rich. Makes sense An overly rich mid range can mask a lean top end to an extent. Looks like Burke's a little burnt Sent from my iPhone using Tapatalk Slit your wrists and go the fuck away, seriously. You're making big jumps in jetting... It doesn't take long to melt a piston... Have at it This. 1 Quote Link to comment Share on other sites More sharing options...
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