lewis cosgrove Posted February 2, 2013 Report Share Posted February 2, 2013 Hi, just wonder what would give the best running. Bike - Sherco 2009 290 Pilot Jet - 35 Main Jet - 122 (Use to be 33, 118) Quote Link to comment Share on other sites More sharing options...
copemech Posted February 3, 2013 Report Share Posted February 3, 2013 The question itself is too general. Things do vary a bit carb to carb and bike to bike, then you add dirrerent fuels, and then personal prefs and expectations. Then throw in cold or hot temps and such. Long story made short, if it runs fine at your current settings and you are able to set the fuel trim screw to a decent response, then you do not have a problem. I can tell you you are in the window it seems, now if you have a problem say revving out cleanly and quickly, you may want to go back to the 118 main jet. Call Splatshop Chris for further generalities! Quote Link to comment Share on other sites More sharing options...
paul w Posted February 3, 2013 Report Share Posted February 3, 2013 your riding it, you tell us! Quote Link to comment Share on other sites More sharing options...
lewis cosgrove Posted February 3, 2013 Author Report Share Posted February 3, 2013 Thanks for the help! Bike runs and idles fine. Just wondering if 35 122 was rich for my height and what others ran at a similar height. Can someone explain what a rich bog is? If the standard is 33 120 for seal-level should i not really go down in numbers as there's less air Quote Link to comment Share on other sites More sharing options...
paul w Posted February 3, 2013 Report Share Posted February 3, 2013 A rich bog is where Richard Branson dumps...................... Colder air is denser , more oxygen, leaner mixture. Your right altitude means thinner air. If your bike feels like the choke is on its too rich, if you open the throttle and it makes induction noise but loses power this is usually over lean, in this case putting the choke on makes it better. Jetting is a dark art, and nigh on impossible to over the internet. 1 Quote Link to comment Share on other sites More sharing options...
copemech Posted February 4, 2013 Report Share Posted February 4, 2013 Your altitude above sea level is a non factor really. The temps and baro effect more change than your altitude where you are. If you want to see these changes, plug your numbers into a "density altitude calculator" google it! Quote Link to comment Share on other sites More sharing options...
lineaway Posted February 4, 2013 Report Share Posted February 4, 2013 If the standard is 33 120 for seal-level should i not really go down in numbers as there's less air? All the bikes come lean from the factory. Quote Link to comment Share on other sites More sharing options...
neo Posted February 6, 2013 Report Share Posted February 6, 2013 A 604 Ft long jet would be perfect!! ... sorry I couldn't resist Quote Link to comment Share on other sites More sharing options...
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