05-16-2021, 12:59 AM | #1 |
Join Date: May 2021
Posts: 1
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Another Mikuni Carb jetting question
Hi all!
I have had a hawk 250 for about a year and have not really touched it in a while due to being at school. I bought a mikuni carb for it after I got it because it wasnt running great at all, but never got the chance to install it or rejet it. I have seen a million posts on this and have found it is generally recommended that you do a pilot jet of 25,27.5, or 30 depending on elevation and a main jet of 105-115 depending on elevation. I was wondering before I just make a guess based on that information what someone with experience with rejetting carbs thinks I should do. I live at about 500 feet above sea level and my bike is fully stock. I was thinking based on everything I have read I was thinking 27.5 and 110 maybe? Does that sound about right? I am going to mess with it but as I have no experience with carbs I want to start as best I can so I do not have to change as much. Thanks for any help! |
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05-16-2021, 01:15 AM | #2 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Fully stock at 1100ft I found a 25 pilot, 105 main, and needle in the 4th notch down and the idle mixture about 1 3/4 turns out to work very well for me in the hotter months.
A 110 may work better for you, or maybe even a 107.5 if you really want to get into fine tuning. Only way to know for sure is with a proper plug chop.
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08-11-2021, 03:29 PM | #3 |
Join Date: Aug 2021
Location: Richmond, VA
Posts: 2
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Looking for guidance here too
So,
I ordered a Vitacci Raven 250. Due in about a week. I wanted to do some of the simple mods right out of the box during assembly. One of which is to upgrade the carb. My intention was to do a drop in replacement of the stock carb with one that is higher quality and more tunable but to make my best starting guess here. What I think I hear is this, will you guys please confirm so I order the right parts? I'll spend my riding life at 200 ft, down to sea level but up to 3700 ft in the National Forests. I think this is an elaboration of this thread, so I'm posting here... PWK Carburetor 28MM 115 30 1.5 turns out. (Note: I'm not gutting the airbox. I plan to ride through dirt, mud and creeks with the thing. I need the carb to connect to the stock airbox.) |
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08-11-2021, 03:48 PM | #4 |
Join Date: Dec 2018
Location: PNW
Posts: 983
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If your post is correct, that being a PWK 28 is what you are installing---- that is a whole different animal and probably should be set in its own post otherwise it will confuse Mikuni carburetor tuners.
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08-11-2021, 04:04 PM | #5 |
Join Date: Oct 2020
Posts: 130
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I also have a minkuni. At sea level, I am using a 110 main, 27.5 pilot and 1.5 turns out on the fuel/air screw on the bottom middle. I left the needle alone.
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08-17-2021, 09:21 AM | #6 |
Join Date: Aug 2021
Location: Richmond, VA
Posts: 2
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Looking for guidance here 2
Hey, Thanks Jersey, I'll start where you are. China Rider, you are probably right. I'll refrain from further posts here.
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08-17-2021, 03:48 PM | #7 |
Join Date: Jun 2021
Posts: 110
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Hey.. same carb as the TBR7.. we've started compiling a chart on the website, scroll to the bottom: https://tbr7.com/upgrades/fuel-system/
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