hawk 250 with vm26 jet size

jatgm1 · 05-02-2017, 10:04 AM

hey, with a hawk 250 that has an opened up air box and stock exhaust with a mukini vm26 carb what size jets do you use? just so i have somewhere to start. also whats the best carb for this bike? im in upstate ny. heard altitude messes with jetting.

Weldangrind · 05-02-2017, 01:30 PM

I don't have a hawk, but I've messed with several motors just like it. With a 30mm Mikuni, I'd start with a 30 slow jet and a 110-115 main jet (my quad is currently at 110) at sea level. Ride it, do a few plug chops and see what it tells you. As you increase in elevation, lean it out. As it gets colder, fatten it up.

old kid · 05-02-2017, 01:41 PM

the 110 to 115 will be a good place to start, the carb you have is fine, you might want to consider modifying the exhaust also, i cut the cat. converter out and removed the spark screen and drilled additional 1/2" holes in the baffles to allow more flow, i run a 125 main jet with a 25 pilot jet it seems to like it, no issues with it.
i took a ride thru the mountains last week i didnt notice any difference in it.

enforcer89 · 05-02-2017, 02:07 PM

I was getting ready to order one for my hawk I'm running stock carb now and it isn't reliable:( . I didn't wanna have to change jets I was hoping it would be good to go without messing with it . Having second thoughts now . Maybe cheaper to just change the jets in my stock carb

Megadan · 05-02-2017, 03:53 PM

Quote:

Originally Posted by enforcer89

I was getting ready to order one for my hawk I'm running stock carb now and it isn't reliable:( . I didn't wanna have to change jets I was hoping it would be good to go without messing with it . Having second thoughts now . Maybe cheaper to just change the jets in my stock carb

Welcome to the world of carburetors. Once you have it setup well for where you live, it should do ok most of the time, but a drastic enough change in the climate and it will start to misbehave - I.E. If you set it up on a 90 degree day and a few months later you go to ride on a 40 degree day, it may act a bit lean and vice versa. This is why it's recommended to have an assortment of jets on hand.

Once you figure out the right combo, usually you can get by without tinkering too much, but it is just the nature of the beast. Don't let it discourage you too much though. These carbs are easy to access, and even easier to swap jets on

jatgm12 · 07-22-2024, 12:17 PM

Quote:

Originally Posted by Megadan

Welcome to the world of carburetors. Once you have it setup well for where you live, it should do ok most of the time, but a drastic enough change in the climate and it will start to misbehave - I.E. If you set it up on a 90 degree day and a few months later you go to ride on a 40 degree day, it may act a bit lean and vice versa. This is why it's recommended to have an assortment of jets on hand.

Once you figure out the right combo, usually you can get by without tinkering too much, but it is just the nature of the beast. Don't let it discourage you too much though. These carbs are easy to access, and even easier to swap jets on

Hey, old thread, but where should I start with the slow jet? I got a jet kit but the stock jet has no indication of what size it is so idk. The main is a 117.5.
I have an exhaust with no restrictions just a baffle. Cat is gone. The intake is just a clamp on filter too.

Weldangrind · 05-03-2017, 12:58 PM

To add to that, the 30mm Mikuni that is so prevalent on eBay is very easy (and cheap) to find jets for. If you really want to get into it, you can drill jets out to just about whatever you wish. I use a numbered drill bit set that goes as small as #60 for the main jet, but the slow jet requires an even smaller set that goes down to #80.

jatgm1 · 05-04-2017, 04:24 PM

Quote:

Originally Posted by Weldangrind

To add to that, the 30mm Mikuni that is so prevalent on eBay is very easy (and cheap) to find jets for. If you really want to get into it, you can drill jets out to just about whatever you wish. I use a numbered drill bit set that goes as small as #60 for the main jet, but the slow jet requires an even smaller set that goes down to #80.

where can i find a kit of pilot jets for the vm26?
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
this is the carb i got, and i cant seem to find slow jets just what are called main jets, idk of their any different other than jet size. the kit i got for the carb come with jets that are too big for using as an idle i think
#88 x 1
#90 x 1
#95 x 1
#98 x 1
#100 x 1
#105 x 1
#110 x 1
#115 x 1
#120 x 1
#125 x 1

Kipper1012 · 05-04-2017, 04:50 PM

Did you try jetsrus.com ?

https://www.jetsrus.com/carburetor/c...iew_parts.html

da4design · 05-04-2017, 05:22 PM

Quote:

Originally Posted by Kipper1012

Did you try jetsrus.com ?

https://www.jetsrus.com/carburetor/c...iew_parts.html

thats where i ordered mine, find your jet by pic here
https://www.jetsrus.com/a_jets_by_ca..._selection.htm

Megadan · 05-04-2017, 05:37 PM

The pilot on the Mikuni clones should be the VM28/428, but as da4design suggested, remove yours and check before ordering to make sure.

Forgiven1 · 12-07-2018, 04:49 PM

I have the 2019 Tao Motor TBR7 250 which is basically another version ofthe Hawk. Factory carb ran ok, but sputtered pretty hard at 3/4 to Full throttle. Installed Mikuni carb 110 jet, fuel screw out 2 turns from tight, needle jet set one click down from the top (how it was in the box). Air box and exhaust are factory. This eliminated all of the sputter, and gave the bike overall a much zippyier feel to it. Only other adjustment I had to make was the idle screw maybe 1/8" turn if that. I'm at around 900' elevation. Awesome!

05-02-2017, 01:30 PM	#2
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I don't have a hawk, but I've messed with several motors just like it. With a 30mm Mikuni, I'd start with a 30 slow jet and a 110-115 main jet (my quad is currently at 110) at sea level. Ride it, do a few plug chops and see what it tells you. As you increase in elevation, lean it out. As it gets colder, fatten it up. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	1

05-03-2017, 12:58 PM	#7
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	To add to that, the 30mm Mikuni that is so prevalent on eBay is very easy (and cheap) to find jets for. If you really want to get into it, you can drill jets out to just about whatever you wish. I use a numbered drill bit set that goes as small as #60 for the main jet, but the slow jet requires an even smaller set that goes down to #80. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

05-02-2017, 10:04 AM	#1
jatgm1 Join Date: Apr 2017 Posts: 147	hawk 250 with vm26 jet size hey, with a hawk 250 that has an opened up air box and stock exhaust with a mukini vm26 carb what size jets do you use? just so i have somewhere to start. also whats the best carb for this bike? im in upstate ny. heard altitude messes with jetting.
	0

05-02-2017, 01:41 PM	#3
old kid Join Date: Feb 2017 Location: NY Posts: 170	the 110 to 115 will be a good place to start, the carb you have is fine, you might want to consider modifying the exhaust also, i cut the cat. converter out and removed the spark screen and drilled additional 1/2" holes in the baffles to allow more flow, i run a 125 main jet with a 25 pilot jet it seems to like it, no issues with it. i took a ride thru the mountains last week i didnt notice any difference in it.
	1

05-02-2017, 02:07 PM	#4
enforcer89 Join Date: Apr 2017 Location: Ca Posts: 32	I was getting ready to order one for my hawk I'm running stock carb now and it isn't reliable:( . I didn't wanna have to change jets I was hoping it would be good to go without messing with it . Having second thoughts now . Maybe cheaper to just change the jets in my stock carb
	1

05-04-2017, 04:50 PM	#9
Kipper1012 Join Date: Mar 2017 Location: Florida Posts: 198	Did you try jetsrus.com ? https://www.jetsrus.com/carburetor/c...iew_parts.html __________________ 2016 Green Bashan Brozz.
	0

05-04-2017, 05:37 PM	#11
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	The pilot on the Mikuni clones should be the VM28/428, but as da4design suggested, remove yours and check before ordering to make sure.
	0

12-07-2018, 04:49 PM	#12
Forgiven1 Join Date: Dec 2018 Location: Hollister, MO Posts: 13	I have the 2019 Tao Motor TBR7 250 which is basically another version ofthe Hawk. Factory carb ran ok, but sputtered pretty hard at 3/4 to Full throttle. Installed Mikuni carb 110 jet, fuel screw out 2 turns from tight, needle jet set one click down from the top (how it was in the box). Air box and exhaust are factory. This eliminated all of the sputter, and gave the bike overall a much zippyier feel to it. Only other adjustment I had to make was the idle screw maybe 1/8" turn if that. I'm at around 900' elevation. Awesome!
	0