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Cyclonecharlie
| Posted on Tuesday, July 17, 2012 - 05:21 pm: |
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I picked up a used 42 carb. and I need a starting point on the jets...etc. It's going on a 2K M2 w/ race exhaust,A/C,X1 cams etc. Any help would be appreciated.![](http://www.badweatherbikers.com/buell/clipart/headscratch.gif) |
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Kilroy
| Posted on Tuesday, July 17, 2012 - 05:54 pm: |
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You have air conditioning? |
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Kilroy
| Posted on Tuesday, July 17, 2012 - 05:55 pm: |
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Seriously -go to Mikuni website and download their tuning manual. |
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Kilroy
| Posted on Tuesday, July 17, 2012 - 06:14 pm: |
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I think the Mikuni comes stock with a 160 main, which is standard jetting for a stock Harley motor. You are at sea level - I would try about a 170 main, needle in the middle and work from there |
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Cyclonecharlie
| Posted on Tuesday, July 17, 2012 - 08:55 pm: |
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Tom, Thanks for the info....what are you using for a pilot jet? |
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Kilroy
| Posted on Wednesday, July 18, 2012 - 02:51 am: |
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I left the factory one in there. If the best idle you can get is with less than one turn on the idle screw, go up a size. If you go more than 2 1/2 turns out and your idle doesn't slow, you need a smaller one. |
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Cyclonecharlie
| Posted on Wednesday, July 18, 2012 - 03:47 am: |
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Thanks Tom, It has a 20 SJ in it. It's a used carb so don't know if that's stock.Don't want to pull the carb anymore than necessary. |
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Kilroy
| Posted on Wednesday, July 18, 2012 - 06:21 am: |
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by the way what did the A/C mean?? |
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Cyclonecharlie
| Posted on Wednesday, July 18, 2012 - 08:00 am: |
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OK, how do you abbreviate air cleaner?LOL![](http://www.badweatherbikers.com/buell/clipart/justride.gif) |
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Jim2
| Posted on Wednesday, July 18, 2012 - 02:00 pm: |
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Add for Mukuni Owners and Tuners Manual. http://sanantonio.craigslist.org/mcy/3097230878.ht ml |
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Kilroy
| Posted on Wednesday, July 18, 2012 - 02:19 pm: |
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or for free: http://www.mikuni.com/pdf/hsr_tuningmanual_021003. pdf |
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Cyclonecharlie
| Posted on Wednesday, July 18, 2012 - 02:50 pm: |
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Jim2, Thanks for the heads up on Craigs List, looks like a good deal. But I've already down loaded the stuff from Mikuni(thanks Tom) I did learn something interesting,The CV choke will fit the Mik. carb., but it doesn't seal according to Mikuni.(have one on order) Now if Tom would just tell me what SJ he's using and save this"Old Man" a lot of extra work, he would be very grateful.LOL |
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Kilroy
| Posted on Wednesday, July 18, 2012 - 03:53 pm: |
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If the tuning manual says what comes in it from the factory , that is what I have in mine. Do the idle screw adjustment process I mentioned earlier to see if you need to change it |
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Buellsrule
| Posted on Wednesday, July 18, 2012 - 08:05 pm: |
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160 main 17.5 SJ A/F screw 2 turns out You'll be real close. |
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Cyclonecharlie
| Posted on Wednesday, July 18, 2012 - 08:42 pm: |
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Thanks Frank...I think I'll go a little richer, you got a fair amount of elevation on me. But I love those mountains. ![](http://www.badweatherbikers.com/buell/clipart/justride.gif) |
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Buellsrule
| Posted on Wednesday, July 18, 2012 - 09:43 pm: |
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Well, we're around 600-1000' around here. |
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Cyclonecharlie
| Posted on Wednesday, July 18, 2012 - 11:19 pm: |
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Take those numbers and change them to inches and would be about right for me.![](http://www.badweatherbikers.com/buell/clipart/justride.gif) |
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Buellsrule
| Posted on Wednesday, July 18, 2012 - 11:40 pm: |
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I've tuned a lot of bikes. Wouldn't be surprised if you ended up at 160/17.5. Good luck. |
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Cyclonecharlie
| Posted on Thursday, July 19, 2012 - 07:45 am: |
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Frank, I wouldn't bet against you.....I'll let ya know, thanks for the info. |
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Cyclonecharlie
| Posted on Thursday, July 26, 2012 - 02:12 pm: |
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Tom & Frank, a little up date: Carb. is on and bike runs good with a 170/20 1 1/2 turns. Haven't done a plug check yet, but it will be close.Had to fab. some cable extenders and some odds and ends,but easy enough. Thanks for the help, Charlie![](http://www.badweatherbikers.com/buell/clipart/justride.gif) |
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Buellsrule
| Posted on Thursday, July 26, 2012 - 05:00 pm: |
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Plugs will probably show rich. |
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