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| Need a new carb - 79 CR250 https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2900 |
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| Author: | osu_cowboy [ Thu Dec 09, 2010 10:59 pm ] |
| Post subject: | Need a new carb - 79 CR250 |
Tired of messing around with the Keihin. No rebuild kits available so I think I'm going to throw a Mik on it. Any suggestions on which model/jetting and best source? I'm at sea level and temps are moderate year round. |
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| Author: | osu_cowboy [ Sat Dec 11, 2010 1:23 pm ] |
| Post subject: | Re: Need a new carb - 79 CR250 |
^ ^ ^ bump to see if anyone has replaced the stock Keihin with a Mikuni and if so, which one and what jetting? |
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| Author: | vonspor [ Sat Dec 11, 2010 2:49 pm ] |
| Post subject: | Re: Need a new carb - 79 CR250 |
I have a Mikuni with stock pipe on my 79 cr250. I also am using a twin air filter and 32 to 1 BelRay MC1. Boyesen Reeds 400 main, needle fill rich, 70 pilot. I may try a little richer on the pilot like a 75 I started a little leaner on the needle and then changed one slot at a time at a practice track 
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| Author: | osu_cowboy [ Sat Dec 11, 2010 6:43 pm ] |
| Post subject: | Re: Need a new carb - 79 CR250 |
Thanks Vonspor! I have a stock pipe w/DG silencer. Boyesen reeds. Dumonde Tech Castor oils @ 32:1. Which Mikuni are you running? |
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| Author: | vonspor [ Sun Dec 12, 2010 11:23 am ] | ||
| Post subject: | Re: Need a new carb - 79 CR250 | ||
I also have a DG Silencer. I couldn't get the bike to work with a DG Pipe. These setting are pretty close to what Thor Lawson is also running. The Mikuni is a 36. I also use a B9ES. With each needle change I made, the plug got a little darker. We will see how a 75 pilot does. The plug is not quite chocolate colored with the 70 pilot. The tracks I run on have a lot of low speed corners. The original carbs. are getting pretty worn out and going to a Mikuni has worked well for me. Also, I don't use any exotic fuel blends - just 93 octane Sunoco Premium. I also have two Maicos (76 and 81). They run on the same fuel and oil mix. I have never owned a Honda before and after a season of racing, I am very impressed with how it works for me.
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| Author: | redrocket190 [ Mon Dec 13, 2010 12:26 am ] |
| Post subject: | Re: Need a new carb - 79 CR250 |
Mikuni VM36 Round Slide Pilot 35 Air screw 1.75 out Slide 2.5 Needle Jet 159-P8 Needle 6FJ6 Clip #2 Main 360-380 Float height 19mm ProForm pipe and silencer Moto Tassarini V-Force reed valve 40:1 Maxima |
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| Author: | osu_cowboy [ Mon Dec 13, 2010 8:02 pm ] |
| Post subject: | Re: Need a new carb - 79 CR250 |
Thanks for the replies guys. Exactly what I needed. I will look for a 36 Mik and start with the recommended jetting and let you know what happens. Happy Holidays, sj |
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