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46 Posts
I'm dumb I suppose, which jets get replaced?
When rejetting to 90/120, which jets get replaced?
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46 Posts
Awesome.I just got her back together after getting rid of that airbox and it runs like crap, rejetting tomorrow.Thanks!
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1,022 Posts
You may need more than a simple rejet. These are CV carbs and rely a lot on the air flow restriction of the air box. I don't even think you hit the main jet until piston is about 3/4 up. So if the vaccuum isn't there to lift the piston a rejet is useless.
Hopefully it works for you. Let us know how it works out. A lot of us run w/out the airbox.
Hopefully it works for you. Let us know how it works out. A lot of us run w/out the airbox.
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37 Posts
Thanks I needed this info to does the higher the number mean bigger hole or opposite? I havent worked on carbs much!
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1,022 Posts
Bigger number = bigger hole = more fuel in.
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37 Posts
whats the odds of putting the jet on a drill press with the correct size bit to make it bigger? Or barely honing it out somehow???
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1,022 Posts
I wouldn't reccommend it.
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37 Posts
Ok
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500 Posts
If you're feeling dangerous,
The main thing is to keep it straight. If you have a good setup/machine shop, you could make a jig to drill jets.
(Width = true hole diameter)
Width------Keihin # -- DynoJets # -- Mikuni #
0.0350---- 92.5--------- 92---------- 86.3
0.0360---- 95----------- 94---------- 88.1
0.0370---- 97.5--------- 96---------- 90.0
0.0380---- 100---------- 98---------- 91.9
0.0390---- 102.5------- 100---------- 93.8
0.0400---- 105--------- 102---------- 95.6
0.0410---- 107.5------- 104---------- 97.5
0.0420---- 110--------- 106---------- 99.4
0.0430---- 112.5------- 108--------- 101.3
0.0440---- 115--------- 110--------- 103.1
0.0450---- 117.5------- 112--------- 105.0
0.0460---- 120--------- 114--------- 106.9
0.0470---- 122.5------- 116--------- 108.8
0.0480---- 125--------- 118--------- 110.6
0.0490---- 127.5------- 120--------- 112.5
0.0500---- 130--------- 122--------- 114.4
0.0510---- 132.5------- 124--------- 116.3
0.0520---- 135--------- 126--------- 118.1
0.0530---- 137.5------- 128--------- 120.0
0.0540---- 140--------- 130--------- 121.9
0.0550---- 142.5------- 132--------- 123.8
0.0560---- 145--------- 134--------- 125.6
0.0570---- 147.5------- 136--------- 127.5
0.0580---- 150--------- 138--------- 129.4
0.0590---- 152.5------- 140--------- 131.3
0.0600---- 155--------- 142--------- 133.1
0.0610---- 157.5------- 144--------- 135.0
0.0620---- 160--------- 146--------- 136.9
0.0630---- 162.5------- 148--------- 138.8
0.0640---- 165--------- 150--------- 140.6
0.0650---- 167.5------- 152--------- 142.5
0.0660---- 170--------- 154--------- 144.4
0.0670---- 172.5------- 156--------- 146.3
0.0680---- 175--------- 158--------- 148.1
0.0690---- 177.5------- 160--------- 150.0
0.0700---- 180--------- 162--------- 151.9
0.0710---- 182.5------- 164--------- 153.8
0.0720---- 185--------- 166--------- 155.6
0.0730---- 187.5------- 168--------- 157.5
0.0740---- 190--------- 170--------- 159.4
0.0750---- 192.5------- 172--------- 161.3
0.0760---- 195--------- 174--------- 163.1
0.0770---- 197.5------- 176--------- 165.0
0.0780---- 200--------- 178--------- 166.9
0.0790---- 202.5------- 180--------- 168.8
0.0800---- 205--------- 182--------- 170.6
0.0810---- 207.5------- 184--------- 172.5
0.0820---- 210--------- 186--------- 174.4
0.0830---- 212.5------- 188--------- 176.3
0.0840---- 215--------- 190--------- 178.1
0.0850---- 217.5------- 192--------- 180.0
0.0860---- 220--------- 194--------- 181.9
0.0870---- 222.5------- 196--------- 183.7
0.0880---- 225--------- 198--------- 185.6
0.0890---- 227.5------- 200--------- 187.5
The main thing is to keep it straight. If you have a good setup/machine shop, you could make a jig to drill jets.
(Width = true hole diameter)
Width------Keihin # -- DynoJets # -- Mikuni #
0.0350---- 92.5--------- 92---------- 86.3
0.0360---- 95----------- 94---------- 88.1
0.0370---- 97.5--------- 96---------- 90.0
0.0380---- 100---------- 98---------- 91.9
0.0390---- 102.5------- 100---------- 93.8
0.0400---- 105--------- 102---------- 95.6
0.0410---- 107.5------- 104---------- 97.5
0.0420---- 110--------- 106---------- 99.4
0.0430---- 112.5------- 108--------- 101.3
0.0440---- 115--------- 110--------- 103.1
0.0450---- 117.5------- 112--------- 105.0
0.0460---- 120--------- 114--------- 106.9
0.0470---- 122.5------- 116--------- 108.8
0.0480---- 125--------- 118--------- 110.6
0.0490---- 127.5------- 120--------- 112.5
0.0500---- 130--------- 122--------- 114.4
0.0510---- 132.5------- 124--------- 116.3
0.0520---- 135--------- 126--------- 118.1
0.0530---- 137.5------- 128--------- 120.0
0.0540---- 140--------- 130--------- 121.9
0.0550---- 142.5------- 132--------- 123.8
0.0560---- 145--------- 134--------- 125.6
0.0570---- 147.5------- 136--------- 127.5
0.0580---- 150--------- 138--------- 129.4
0.0590---- 152.5------- 140--------- 131.3
0.0600---- 155--------- 142--------- 133.1
0.0610---- 157.5------- 144--------- 135.0
0.0620---- 160--------- 146--------- 136.9
0.0630---- 162.5------- 148--------- 138.8
0.0640---- 165--------- 150--------- 140.6
0.0650---- 167.5------- 152--------- 142.5
0.0660---- 170--------- 154--------- 144.4
0.0670---- 172.5------- 156--------- 146.3
0.0680---- 175--------- 158--------- 148.1
0.0690---- 177.5------- 160--------- 150.0
0.0700---- 180--------- 162--------- 151.9
0.0710---- 182.5------- 164--------- 153.8
0.0720---- 185--------- 166--------- 155.6
0.0730---- 187.5------- 168--------- 157.5
0.0740---- 190--------- 170--------- 159.4
0.0750---- 192.5------- 172--------- 161.3
0.0760---- 195--------- 174--------- 163.1
0.0770---- 197.5------- 176--------- 165.0
0.0780---- 200--------- 178--------- 166.9
0.0790---- 202.5------- 180--------- 168.8
0.0800---- 205--------- 182--------- 170.6
0.0810---- 207.5------- 184--------- 172.5
0.0820---- 210--------- 186--------- 174.4
0.0830---- 212.5------- 188--------- 176.3
0.0840---- 215--------- 190--------- 178.1
0.0850---- 217.5------- 192--------- 180.0
0.0860---- 220--------- 194--------- 181.9
0.0870---- 222.5------- 196--------- 183.7
0.0880---- 225--------- 198--------- 185.6
0.0890---- 227.5------- 200--------- 187.5
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10 Posts
Jetsrus.com have these so cheap you would spend more on the drill bit unless you have access to a good machine shop. Plus edge condition of the orifice is so important. I'd really recommend jetsrus.com - no affiliation, just a happy customer.
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46 Posts
So I hooked up the 90/120 jets and slapped on some pods. It's still got the h-box and stock pipes minus the megaphones. It runs pretty stout actually.If the choke is fully open she will stumble slightly, but it goes away after riding for about 30 minutes. I feel like I need to do some more tuning on them but it pulls alot harder now and I love it.Now I need to replace my dying clutch and I'll def. be in business.
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1,022 Posts
Nice. Where you get the jets from? Post a link so we can use it for a reference.
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1,022 Posts
Damn it. Double post.
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46 Posts
I got my jets from a local Honda Store. They had my jets at 5 bucks a piece.I got them for 4.25 a piece since I'm a volunteer fireman(flashed the badge,lol).
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37 Posts
So if i take my pipes off behind the h box it wont damage anything?
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242 Posts
What do you mean by 'damage'? if you mean "require a jetting change" the answer is that it depends on what you replace the stock mufflers with. If the new mufflers flow differently than the old ones did, then a rejet will be required.
Note, also, that everything in the exhaust system rusts together. Removing the pipes without damaging the H box is quite doable, but usually not easy.
Note, also, that everything in the exhaust system rusts together. Removing the pipes without damaging the H box is quite doable, but usually not easy.
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1,022 Posts
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If i wanted to remove my h box what would be required to make it run right?
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133 Posts
Are u goin to just remove the H box? If so ur still goin to have to re jet. You are going to be removing the back pressure. Do u plan on puting any mufflers on?
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