 Jet modification
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Joined: Apr 2007
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OP
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What do the numbers refer to for the main and idle jets? I recently replaced the stock with 160'S. Seems rich. As a machinist I was wondering if it is something I can modify at work on the stock wich if I am correct are 120,s.
My mind and body are still out of tune
I hope they run into each other real soon "
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 Re: Jet modification
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Joined: Jan 2005
Posts: 438
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If 160's are too rich, you can drill out your stock 120's to something in between.
Not you fat Jesus!
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Re: Jet modification
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
Not sure your elevation or set up all I can say is I am running 155 and 48 seems a good mix.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Jet modification
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
You could drill them out, but there are such small differences in actual size, that you'd have to have a real good chart somewhere! Does the 155 refer to mm? Or is it a random sizeing system?
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Jet modification
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
A friend if mine drilled his pilot to get what he wanted. I am not sure I would want to drill jets if it isn't perfect it may not supply the right amount of gas or might not enter the carb correctly and give you a problem with how well it burns.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Jet modification
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Joined: Jan 2005
Posts: 4,931 Likes: 1
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 4,931 Likes: 1 |
they arent that expensive...buy a set so you know it will be right.
we should do this every weekend!
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Re: Jet modification
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Joined: Aug 2006
Posts: 2,555
Loquacious
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Loquacious
Joined: Aug 2006
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I remeber sombody here saying they drilled their jets.
I think like benny said, youd have to break the "code".
What dose 160 and 120 mean? is it like saying size j or k drill? or is it the actual diameter like 1.6 mm.
Measure one of each split the differenc and spin down a reamer.
Better yet buy some new ones.
The percentage you're paying is too high-priced
While you're living beyond all your means
And the man in the suit has just bought a new car
From the profit he's made on your dreams
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Re: Jet modification
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
pry the $3ea. out of your wallet and buy them. 
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Jet modification
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Joined: Jan 2005
Posts: 4,931 Likes: 1
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 4,931 Likes: 1 |
post on the classifieds. someone might have a set.
we should do this every weekend!
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Re: Jet modification
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Joined: Jul 2006
Posts: 1,337
Learned Hand
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Learned Hand
Joined: Jul 2006
Posts: 1,337 |
The internal shape of a jet is not a straight cylinder bore- it is hourglass shaped to promote dispersion of the liquid particles. The 160/ 120/whatever is a flow rate, not a really hole size. Of course there is a size associated to it as a certain size die is needed to make it, but again, you will only ruin the jet if you drill it.
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...
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Re: Jet modification
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Joined: Jan 2005
Posts: 2,664
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 2,664 |
Thanks, Cowboy - that needed to be clarified.
You know, "cowboy" is politically incorrect. I'll continue to call you Cowboy, but the others can refer to you as a "Bovine Organizational Technician" BOT - that'll work.
It's all about the ride!
Ride Safe,
Dennis
Triumph, it's how I live and what I ride.
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Re: Jet modification
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Joined: Jan 2005
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The size 120, is a bore size. It is 1.2mm in bore size. it's THAT SIMPLE. A 135 jet has a 1.35mm bore etc. The 42 pilot is a 0.42mm bore. Remember these are japanes carbs - metric!!
I bought a 1.4mm bit and drilled my 120 main jet to 140. No problem. Yes I could buy some - I'd just have to wait a month! Our dealer has jets for the Harleys (same carbys) and the lowest he could get me was 165.
Drilling is NO PROBLEM - just do it carefully.
Aussies have got.....BUNDY RUM!!
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Re: Jet modification
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
Thats odd you couldn't find jets. Any dealer or cycle repair shop Yamaha , Kawi,Honda, Hardley,Triumph , etc who use the same carbs should have jets. Just a matter of size.Hardley I have found sometimes don't have jets small enough since they run 1 carb not 2. Some still do though.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Jet modification
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Joined: Feb 2006
Posts: 3,017
Loquacious
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Loquacious
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when I was looking for jets in NJ, I called and/or visited at least a dozen shops and nobody...NOBODY had 150s or 155s.
Mark
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Re: Jet modification
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
I think I have some 150s but I used my 155s
Edit: I was going to offer up my 150s but since I am going to try TBS needles I changed my mind until I know the out come of that.
Last edited by The_Dog33; 05/24/2007 2:35 PM.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Jet modification
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Joined: Feb 2006
Posts: 3,017
Loquacious
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Loquacious
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Hear ya...I'm running dynojet needles and 160's and am still a bit lean, put in thrux needles and was so rich the bike wouldn't run. May just order some 162.5s and 165s and see if that helps.
Mark
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Re: Jet modification
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
careful you might not be lean... I've seen where the plugs looked lean, but ran crappy cause it was right, ya know?
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Jet modification
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Jet modification
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Joined: Apr 2007
Posts: 248
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OP
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 Its not the price I know they are cheap enough. My local dealer only has 152.5's in stock. I was only wondering in case I wanted to try and drop from the 160's this weekend. Heck the jets will be the cheapest thing I've bought so far.  I work in a shop so hopefully they might have a 1.5mm reamer. Gonna grab the 152.5's anyway and also 42's for the pilot(yes cause it's the only ones in stock).See how it goes and order if need be. Thanks everyone for your help.
My mind and body are still out of tune
I hope they run into each other real soon "
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Re: Jet modification
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Joined: Mar 2007
Posts: 151
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Posts: 151 |
Quote:
The size 120, is a bore size. It is 1.2mm in bore size. it's THAT SIMPLE. A 135 jet has a 1.35mm bore etc. The 42 pilot is a 0.42mm bore. Remember these are japanes carbs - metric!!
I bought a 1.4mm bit and drilled my 120 main jet to 140. No problem. Yes I could buy some - I'd just have to wait a month! Our dealer has jets for the Harleys (same carbys) and the lowest he could get me was 165.
Drilling is NO PROBLEM - just do it carefully.
Drilling is not a good idea, however sometimes I also drill and use them, but only when I don't find a new one of the desired size.
Because jets are not only drilled. They are drilled and flowed.
Sometimes a 132 is not a 1,32mm, sometimes is a 134 that flows like a 132.
You can't know your drilled 140 flow like a 135 in the right cylinder and a drilled 140 flow right like a 140 on the left cylinder of your bike.
Also the conicity is important. The cone shape inside the jet is made to let the carburant flow have the right acceleration. Drilling the jet the conicity ends at a different point.
And about the Harley jets, NOPE you can't use main jets, only pilot jets are the same.
After 1994-96 Keihin has changed main jet dimension making the same as Mikuni. Before 1994-96 they were bigger in external and thread size. Harley maintained the previous size.
You can find plenty of jets from a Kawasaki reseller and service, because Kawa has always used Keihin in various sizes. CVK32-40 are on ZRX1100/1200, GPZ900, ZX10/11, ER5, KLR, VN800/1500 and many others.
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Re: Jet modification
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
Sorry Machano you are wrong on the hardley bit. They used 3 different threads in those carbs. One of them is the same as ours. It depends on the year of manufacture. I just purchased Hardley jets last week for Wendys bike and they are in there and working great.Plus I got them for $3 form him and Triumph jets were $8 for the same darn jet made by the same co.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: Jet modification
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
You might find the 152s to be good. I dropped down to 155 from 160, plus TBS needles.
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Jet modification
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Joined: Mar 2007
Posts: 151
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Maybe US models. On italian/euopean models I never saw an Harley jet for CV40 equal to a jet for CVK.
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Re: Jet modification
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Joined: Jul 2006
Posts: 1,337
Learned Hand
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Learned Hand
Joined: Jul 2006
Posts: 1,337 |
Quote:
The size 120, is a bore size. It is 1.2mm in bore size. it's THAT SIMPLE. A 135 jet has a 1.35mm bore etc. The 42 pilot is a 0.42mm bore. Remember these are japanes carbs - metric!!
I bought a 1.4mm bit and drilled my 120 main jet to 140. No problem. Yes I could buy some - I'd just have to wait a month! Our dealer has jets for the Harleys (same carbys) and the lowest he could get me was 165.
Drilling is NO PROBLEM - just do it carefully.
Sorry, but that isn't right and please don't shout.
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...
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Re: Jet modification
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Joined: Jan 2005
Posts: 9,223
Big Bore
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Big Bore
Joined: Jan 2005
Posts: 9,223 |
Gee, kinda looks like a V..... as in venturi. As in, increasing the atomization of the fuel.
"Never underestimate the power of human stupidity" - Robert Heinlein
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Re: Jet modification
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Joined: Jul 2006
Posts: 1,337
Learned Hand
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Learned Hand
Joined: Jul 2006
Posts: 1,337 |
Quote:
Gee, kinda looks like a V..... as in venturi. As in, increasing the atomization of the fuel.
I think I've heard that somewhere before... 
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...
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Re: Jet modification
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Joined: Jan 2005
Posts: 2,664
Loquacious
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Loquacious
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Quote:
increasing the atomization of the fuel.
I think the fuel is actually nebulized with the venturi effect. Atomization would break down the molecules to the point where they may not ignite. 
Ride Safe,
Dennis
Triumph, it's how I live and what I ride.
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Re: Jet modification
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Joined: Jan 2005
Posts: 9,223
Big Bore
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Big Bore
Joined: Jan 2005
Posts: 9,223 |
You'd better duck and hide Dennis!!  neb·u·lize (nby-lz) tr.v. neb·u·lized, neb·u·liz·ing, neb·u·liz·es 1. To convert (a liquid) to a fine spray; atomize.
"Never underestimate the power of human stupidity" - Robert Heinlein
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Re: Jet modification
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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