bigborebanshee Posted May 4, 2010 Report Share Posted May 4, 2010 maybe someone with some jetting experience can chime in. I recently changed from Gnarlys to T-5s on my 421(non cub).I run the 30mm oko with a pro flow K&N and a K&N powerlid. The Gnarlys were good on at 150-152 main 52-55 pilot stock oko needle middle clip.(depending on the season) When i changed over to T-5 i found the 152-155 main 50-52 pilot and oko needle on the middle clip. to be the best(depending on the season) I ran the exact same airbox configuration and carbs on a ported 350 i had with Pro circuit pipes.It ran best with 150-152 main and 50-52 pilot,oko needle in stock position. How can 3 different engine with 3 different style pipes be so close in jetting?..can it be because I ran the exact same airbox configurations? I ran a low-mid,mid and mid top pipe and the only had to move 1 jet size? Quote Link to comment Share on other sites More sharing options...
okbeast Posted May 4, 2010 Report Share Posted May 4, 2010 Pro Circuits and T-5's are fairly similar pipes I believe. And yes the air intake being the same would have something to do with it. Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted May 4, 2010 Report Share Posted May 4, 2010 Pro circuits are nothing like T5's. I imagine its the same because of the amount of fuel and air your moving through the motor (airbox inlet cfm amount). I imagine the mid-top pipes were the ones that just needed 1 size larger compared to the low-mids. Quote Link to comment Share on other sites More sharing options...
okbeast Posted May 5, 2010 Report Share Posted May 5, 2010 Word, I stand corrected. Was thinking of somethin else i guess Quote Link to comment Share on other sites More sharing options...
bigborebanshee Posted May 5, 2010 Author Report Share Posted May 5, 2010 Pro circuits are nothing like T5's. I imagine its the same because of the amount of fuel and air your moving through the motor (airbox inlet cfm amount). I imagine the mid-top pipes were the ones that just needed 1 size larger compared to the low-mids. Yes,the T-5s like a 155.I have not done a plug chop yet ,but it pulls violently on the pipe I just thought there would be more of a difference between pipes and even porting,but it does not appear so unless major airflow changes are made. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted May 5, 2010 Report Share Posted May 5, 2010 i have run keihin pwk 33, 35 and 39 over the years on 4mm stock cylinder motors, 4mm cubs, 10mm cub and now my 18mm DM and the jetting has always been 45 or 48 pilot and 160 or 162 main. Quote Link to comment Share on other sites More sharing options...
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