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Cyclonecharlie
Posted on Tuesday, July 17, 2012 - 05:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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.
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Kilroy
Posted on Tuesday, July 17, 2012 - 05:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You have air conditioning?
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Kilroy
Posted on Tuesday, July 17, 2012 - 05:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Seriously -go to Mikuni website and download their tuning manual.
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Kilroy
Posted on Tuesday, July 17, 2012 - 06:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

by the way what did the A/C mean??
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Cyclonecharlie
Posted on Wednesday, July 18, 2012 - 08:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

OK, how do you abbreviate air cleaner?LOL
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Jim2
Posted on Wednesday, July 18, 2012 - 02:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks Frank...I think I'll go a little richer, you got a fair amount of elevation on me. But I love those mountains.
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Buellsrule
Posted on Wednesday, July 18, 2012 - 09:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, we're around 600-1000' around here.
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Cyclonecharlie
Posted on Wednesday, July 18, 2012 - 11:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Take those numbers and change them to inches and would be about right for me.
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Buellsrule
Posted on Wednesday, July 18, 2012 - 11:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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
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Buellsrule
Posted on Thursday, July 26, 2012 - 05:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Plugs will probably show rich.
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