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When you adjusted the Needle clip, do you remeber what slot it ended up in? Do you know what style/brand of jets the new carb uses? |
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I have quite a carb collection going lol. |
[QUOTE=When you adjusted the Needle clip, do you remeber what slot it ended up in? Do you know what style/brand of jets the new carb uses?[/QUOT]
So we don't get mixed up in which direction: http://www.chinariders.net/picture.p...pictureid=1313 I had originally ordered a jet kit from 6sigma. You tell them what you have and any modifications you have done. They send you a kit to optimize your carb. I never installed it in the original carb so I just used the main jet for this pumper carb. The other jet was made a little different so I didnt change it. Took a chance ***got in a hurry to try it***. |
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Megadan: I bought a Keihin Brand PZ30 pump carb. How close do you think the jetting will be on the Mikuni vs the Keihin as far as fuel supply go? I have a 30/120 in the Mikuni, should I just buy the equivalent sizes in the Keihin brand? I would plan on buying a few different sizes. |
Using the VM26 jetting as a starting point isn't entirely a bad idea, but you will likely have to tweak the jetting a tiny bit to run better with the pumper.
In this case, the keihin pilot jet size will likely be around a 40 (38, 40, 42). The main jet, if we are comparing genuine jets, would be around a 138 - A mikuni 120 orifice size and a Keihin 138 are the closest equivalents to one another. Wether this holds true with the jets from other companies is a different question. |
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http://www.chinariders.net/picture.p...pictureid=1314 Like I said, I just used the 115 main jet from the kit that was for my original stock carb. The pumper carb had an adjustable needle already so didn't need the shims. The pilot jet was made different so I didn't change it. I could not tell what it was either. If there was a mark on it, I could not see it. |
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Douglass |
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A Metric measurement will be equivalent to a Mikuni jet (eg. #38 = 0.38mm). Once you know that number, you can cross-reference to a Keihin chart. The index will come with a pin vise, which allows you to chuck the bit and drill a jet. I've drilled several slow jets that way with good results. Here's one: https://www.ebay.com/itm/17pc-Fine-T...UAAOSwR2RaJ9~m |
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Beware that a cheap numbered index between 61-80 has a high likelihood of being a jumbled mess. I took the time to measure all of the bits and arrange them; there are duplicates and triplicates of some and zero of others. At that price, it doesn't bother me at all.
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The more I ride with this new carb the more impressed I am.
One thing that is baffling me. Vibration. Lack of vibration I should say. On the dirt I can't tell that much. On pavement it is just amazing how much smother it is. I have been racking my brain trying to make sense of this.:hmm: How can changing a carburetor make an engine vibrate less? I did get quite a tingle on the pavement in the pegs, seat, and grips with it stock. I did change the steel gas tank to a plastic one when I changed the carb. I wonder if that has anything to do with it? |
I would be willing to bet the Gas tank made the improvement. I bet the plastic absorbs some vibration, vs the metal. Being that it connects to the seat it makes sense.
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You could always put the metal gas tank back on for testing.
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Well, you convinced me enough to try a pumper carb... on my CR125 Zong powered bike. It has great torque, but is not snappy. You have to get on the throttle waaay ahead of time to get a reaction from the motor.
Hoping this gives it a little more snap. |
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