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| jetting a mikuni 36mm carb for a 1974 cr250m https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=1876 |
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| Author: | simiont [ Mon May 26, 2008 3:34 am ] |
| Post subject: | jetting a mikuni 36mm carb for a 1974 cr250m |
My bike seems to run rich I have a 300 main 50 pilot and 2.0 air jet the bike has a mossemberg reed valve and a circle f pipe I dropped the main down to a 290 and it did lean it up but it's not running clean it seems to struggle at low revs then goes ok but doesn't seem to rev out , it also has a pvl ignition can anyone give me their jet settings or any advice . thanks |
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| Author: | simiont [ Mon May 26, 2008 4:04 am ] |
| Post subject: | Re: jetting a mikuni 36mm carb for a 1974 cr250m |
the needle is a 6h4 |
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| Author: | mitchie [ Tue May 27, 2008 1:59 pm ] |
| Post subject: | Re: jetting a mikuni 36mm carb for a 1974 cr250m |
Do you know what needle jet you are running?? |
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| Author: | simiont [ Wed May 28, 2008 9:37 am ] |
| Post subject: | Re: jetting a mikuni 36mm carb for a 1974 cr250m |
if you mean the main jet it's a 300 |
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| Author: | mitchie [ Wed May 28, 2008 7:42 pm ] |
| Post subject: | Re: jetting a mikuni 36mm carb for a 1974 cr250m |
Not the main jet. The needle jet is the brass part the needle goes down into and the main jet screws on the bottom of. For instance, I'm running a 159Q4 needle jet on my 36 Mikuni. I also run a 6f4 needle, 270 main and a 35 pilot. The needle you use will depend largely on what needle jet you use. Every bike is different and With your pipe, I'm guessing you're real close on your main jet. You are going to have to figure out whether you are currently rich or lean on your midrange, though. Once you determine that, try readjusting your needle in the proper direction. If you get to the end of the adjustment and are still rich/lean, you are going to have to change the needle a size. |
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| Author: | redrocket190 [ Wed May 28, 2008 8:03 pm ] |
| Post subject: | Re: jetting a mikuni 36mm carb for a 1974 cr250m |
Go to http://www.sudco.com and download their catalog. It has lists of all the Mikuni parts with their specifications, and some good background on tuning. |
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