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| 1973 cr250 jeting for 38mm mikuni https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2047 |
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| Author: | jimg1au [ Tue Oct 14, 2008 8:13 pm ] |
| Post subject: | 1973 cr250 jeting for 38mm mikuni |
hi can anyone help me with jetting specs for the 38mm mikuni carb for my 1973 cr250m. it also has a read valve set up from mx360 yamaha fitted. cheers jim |
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| Author: | mrmikkelsen [ Tue Oct 14, 2008 9:56 pm ] |
| Post subject: | Re: 1973 cr250 jeting for 38mm mikuni |
I pulled a 38mm Mikuni off a well-sorted 74 recently and jotted down the jetting specs. Main 320; pilot 60; Slide 2.5; Jet needle 6DP7 middle groove. The bike had a DG head, race pipe, and was ported and it ran really well. And the bike is for for sale with a stock head and with a stock Keihin carb if anybody needs an Elsinore. |
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| Author: | mitchie [ Wed Oct 15, 2008 8:17 pm ] |
| Post subject: | Re: 1973 cr250 jeting for 38mm mikuni |
mrmikkelsen: out of curiousity and the never ending quest for knowledge to make assorted parts sometimes work correctly, did you notice what needle jet was in the carb body?? Thanks, -Mitch |
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| Author: | mrmikkelsen [ Wed Oct 15, 2008 9:44 pm ] |
| Post subject: | Re: 1973 cr250 jeting for 38mm mikuni |
Aargh! No, I sure didn't look, or at least I didn't write it down. Given time, I'll be back into the bike again, but that won't be right away. Hopefully somebody else can do better? |
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| Author: | frohrs [ Fri Oct 17, 2008 12:35 am ] |
| Post subject: | Re: 1973 cr250 jeting for 38mm mikuni |
Here is what I use and I am in California. My 73 CR250 has a 38mm Mikuni Roundslide. 300 mj, 25p, q-6 nj, 6DH7 #3 N, 2.5 slide. 3rd over on the top end & a circle -F pipe at the time. frohrs1 |
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| Author: | jimg1au [ Mon Oct 20, 2008 12:52 am ] |
| Post subject: | Re: 1973 cr250 jeting for 38mm mikuni |
thanks guys for the help will report back with results. also might post a progress pic cheers jim |
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