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Discussion Starter · #1 ·
I am currently at F182/R185----Checked plugs after 125 miles of off/on in the dunes---Front looks good but the rear is a little more burnt/carboned---Plus the rear exhaust has some black soot---So apparently the 185 is a little rich, but there is no 183 or 184 so then 182, (same as front would be the only other alternative)---Just curious if there is a 183-4 that I am missing---I oiled the TwinAir filter for the first time before leaving and think I over oiled it some---But that would make both cylinders rich--not just one???

This is list of sizes that I found

Keihin Round 99101-393 Main Jet
8mm in length with a 6mm Round Head

Kawasaki ATV, Street and Offroad models with CVK, ATV’s with CVKR-D (V-Twin ATV)
Suzuki ATV with CVK, Twin Peaks 700 with CVKR-D (V-Twin ATV).


JET SIZES AVAILABLE
60 62 65 68 70 72 75 78 80 82 85 88 90 92 95 98 100 102 105 108 110 112 115 118 120 122 125 128 130 132 135 138 140 142 145 148 150 152 155 158 160 162 165 168 170 172 175 178 180 182 185 188 190 192 195 198 200
Keihin Round 99101-393 Main Jet

Kenny
 

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Discussion Starter · #3 ·

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another option if you have needle drills is to check the drill size of the 182 & 185...
there will be drill sizes in between...
take smaller 140 or so...whatever you have & don't use...
and drill it out to one drill size over the 182...
install it and run it...
if it's lean do it again...etc..etc..
 

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Speed is correct. Plus going from 185 to 184 isnt going to change the your a/f ratio but maybe by .05 if even that.
 

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Good info to know:D
 

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Here is a general statement... Since i have a machine shop and i have # drill bits (i tunned mine to the tee, well pretty darn close). Anyway while tunning i noticed that going from a .067 dia to a .070 dia gave me a .5 difference on my A/F meter. Hope this helps.

I dont know what that converts to in jet sizes but there is a lil diameter difference that made a decent change.
 

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Its very hard to jet by reading the plugs. I always had mine a nice tan, when I put the a/f meter on it it was way to rich in the mid and then very lean on the top end. According to the plugs I thought it was perfect but in reality it was way off.
 

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Discussion Starter · #12 ·
Its very hard to jet by reading the plugs. I always had mine a nice tan, when I put the a/f meter on it it was way to rich in the mid and then very lean on the top end. According to the plugs I thought it was perfect but in reality it was way off.
How in the world would you correct that scenario--Rich mid/Lean top---Smaller pilot and bigger mains???

Kenny
 

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Discussion Starter · #14 ·
Prior to this trip I ran the same 182/185 and no soot in the exhaust and plugs both identical---I'll bet it is the over oiled air filter blocking some of the air and making that rear burn over rich---Are any of you using the TwinAir's own filter oil---It's dark,(real dark) blue---It's so thick that it's real hard to get a thin coat on---As expensive as it is, I think I'll try something else.

Kenny
 

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Kenny, don't waste your time ordering more jets. That is very common and isn't making hardly any difference in your A/F.
True, you would be lucky to even measure the ratio difference between 1/2 sized jets.
 

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Discussion Starter · #16 ·
Is anyone else who has the Twin Air Power kit using Twin Air oil---It's called Liquid Power in a biue quart can and again really thick dark blue stuff insde---If so any problems with it-----The stuff they used on the pre-oiled filter was great and worked good---No carbon with that at all.

Kenny
 

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Hey Kenny I use the twin air oil. It is thick, I cover it with oil, work it all in real good then wring the living crap out of it. The I hang it on a hanger for it to tack up. I dump the excess back into the quart can. I normally have a little film in the bottom of the air box. But never loose oil at the bottom.
 

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Discussion Starter · #18 ·
Man you really soaked yours---probably more oil in yours than mine---I took an ounce or 2 and put it in a little spray bottle---Sprayed small area on outer foam and with plastic gloves on, worked it as far as it would go and did this over and over til the entire outer foam was dark blue---none on the inside at all---Then I sqeezed whatever excess there was out and even rubbed outer surface real well with a rag---No film at bottom at all---125 miles later, (2 weeks) and I could still run my finger on the outer surface and get blue oil on my finger?????

Kenny
 

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Hey Kenny I use the twin air oil. It is thick, I cover it with oil, work it all in real good then wring the living crap out of it. The I hang it on a hanger for it to tack up. I dump the excess back into the quart can. I normally have a little film in the bottom of the air box. But never loose oil at the bottom.
I do mine similar to your's:
Thoroughly soak the filter to make sure the oil gets completely through the foam and coats every cell, squeeze out the excess and pour it back in the bottle. I have a 2002 flat filter, so my last step is to lay the filter between two rags and step on it to remove any more excess oil. It's left with just the right amount of oil, w/o any dripping.
 

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It's not uncommon for the rear cylinder on some machines to want a leaner jet. I've seen this on many duals with both stock and built motors. You give them what they want and the power goes up. being the yoshi has the crossover pipe that could affect the rear jetting as well. the carbs are just mass produced pieces. you can have a slide that doesn't go down 1mm as far as the other slide does. so that's like you have the needle shimmed when you actually don't.

but reading the plugs is fairly hard to do. as you can't tell where you are rich or lean at. I always recomend testing with the a/f sensor. it's not that hard to do and it makes it run better.

John
 
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