hp2000 Posted July 9, 2011 Report Share Posted July 9, 2011 So I live at around sea level in California and want to go ride in Gorman (hungry valley) and was wondering how much my jetting needs to change. As of now this ia how it sits: Single 38mm pwm 200 main 58 pilot Neddle in middle 3rd don't remember needle type Timing +5 Stock cdi Race ported Cool head 19cc domes on 370 long rod kit. Compression at 175 T5 pipes. Any info to make this easier would help thank you. Quote Link to comment Share on other sites More sharing options...
soccer4orlife Posted July 10, 2011 Report Share Posted July 10, 2011 So I live at around sea level in California and want to go ride in Gorman (hungry valley) and was wondering how much my jetting needs to change. As of now this ia how it sits: Single 38mm pwm 200 main 58 pilot Neddle in middle 3rd don't remember needle type Timing +5 Stock cdi Race ported Cool head 19cc domes on 370 long rod kit. Compression at 175 T5 pipes. Any info to make this easier would help thank you. i read in the jetting forum, go up a full jet size every 500ft. example i was givin (500ft-160 main)(1000ft-170 main) hope that helps Quote Link to comment Share on other sites More sharing options...
hp2000 Posted July 10, 2011 Author Report Share Posted July 10, 2011 So the higher you go the richer it needs to be? Quote Link to comment Share on other sites More sharing options...
soccer4orlife Posted July 10, 2011 Report Share Posted July 10, 2011 yes. dont forget if your riding with paddles the paddles will lean it out. Quote Link to comment Share on other sites More sharing options...
soccer4orlife Posted July 10, 2011 Report Share Posted July 10, 2011 i mean u always want it to be a little rich, its safer that way. but when u go up in elevation the air density changes, so the the fuel. so be prepared to play with jetting and the air mixture screws. Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted July 10, 2011 Report Share Posted July 10, 2011 The above is misinformation. The air gets thinner when you go up in elevation, so you have to lean it out! I have a mostly stock bike except for my Trinity Racing 2 into 1 34mm PJ Keihin, K&N pod filter and my Paul Turner mids. My bike did well with a 182 Main at Pismo, (sea level). Went to Sand Mountain, NV (4000 ft) and I couldn't pull 4th gear up the mountain where the peak is ~4500 ft. Dropped down to a 175 Main and I was able to pull 4th no problem. 2 weeks later I was back down at Pismo bike was an absolute beast. It would pull the front tires up rolling the throttle on in 3rd. I ripped on it pretty hard and never got above 160*F. Do your research. IIRC, for every 1700ft up in elevation you go you're supposed to go down 1 Main Jet size, example, 182 to 180. Is your bike dyno tuned at sea level? Quote Link to comment Share on other sites More sharing options...
soccer4orlife Posted July 10, 2011 Report Share Posted July 10, 2011 well if thats true then my bike and my builder must be fucked up cause when i go from my house to the dunes i follow the guidline i gave and go up with the elevation and the performance gets better. just say. now the elevation change isnt as drastic as whats being described but there is a difference so i guess its all prefference Quote Link to comment Share on other sites More sharing options...
hp2000 Posted July 10, 2011 Author Report Share Posted July 10, 2011 I've been researching also and it seems leaning out is the way from sea level to higher elevation. Anyone else has anymore info? Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted July 10, 2011 Report Share Posted July 10, 2011 (edited) well if thats true then my bike and my builder must be fucked up cause when i go from my house to the dunes i follow the guidline i gave and go up with the elevation and the performance gets better. just say. now the elevation change isnt as drastic as whats being described but there is a difference so i guess its all prefference http://www.google.com/#q=two+stroke+jetting+and+elevation Think about it man, air gets thinner with altitude so less oxygen is available, so less fuel is required so leaner jetting is required. This thread should put any questions you or your engine should have about jetting and elevation. http://www.horizonsunlimited.com/hubb/suzuki-tech/high-altitude-carb-jetting-8431 Edited July 10, 2011 by Strm Trpr Quote Link to comment Share on other sites More sharing options...
soccer4orlife Posted July 11, 2011 Report Share Posted July 11, 2011 http://www.google.com/#q=two+stroke+jetting+and+elevation Think about it man, air gets thinner with altitude so less oxygen is available, so less fuel is required so leaner jetting is required. This thread should put any questions you or your engine should have about jetting and elevation. http://www.horizonsunlimited.com/hubb/suzuki-tech/high-altitude-carb-jetting-8431 srem trpr is correct. i taled to my guy again and read up some more info. and they were baising it off of humidity as well and the elevation change from chicago to silver lake isnt that much of a difference. my bad Quote Link to comment Share on other sites More sharing options...
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