Rejetting CVK30s where 2&3 mains are > 1&4
- pyxen
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Rejetting CVK30s where 2&3 mains are > 1&4
23 Dec 2009 09:17
Hi,
So I've got my ZR550 carbs sitting split open on my bench in the basement, and before I put them back on the bike I want to rejet to increase my main size.
Right now it's jetted to (1-4) 108, 110, 110, 108, to account for hotter middle cylinders. If I get 5 115s from Z1, would I be messing with it too much? It's got a 4 into 1 stock exhaust on it, but I'm looking at putting pods on.
I taped up about a 3rd of the air filter for the latter half of the season and had great tan plugs, but no power.. so I figure an unobstructed air filter and larger mains will be really sweet..
So - 115s all across, or should I just go 112/115/115/112?
As soon as I can get this buttoned up, I can start on my KZ550 again!
So I've got my ZR550 carbs sitting split open on my bench in the basement, and before I put them back on the bike I want to rejet to increase my main size.
Right now it's jetted to (1-4) 108, 110, 110, 108, to account for hotter middle cylinders. If I get 5 115s from Z1, would I be messing with it too much? It's got a 4 into 1 stock exhaust on it, but I'm looking at putting pods on.
I taped up about a 3rd of the air filter for the latter half of the season and had great tan plugs, but no power.. so I figure an unobstructed air filter and larger mains will be really sweet..
So - 115s all across, or should I just go 112/115/115/112?
As soon as I can get this buttoned up, I can start on my KZ550 again!

84 KZ550-F2 LTD
93 ZR550-B4
93 ZR550-B4
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- Nebr_Rex
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Re: Rejetting CVK30s where 2&3 mains are > 1&4
23 Dec 2009 11:28
My ZRX came stock with staggard(?) jetting,now it is jetted the same across from 1 thru 4 and runs fine.
2002 ZRX1200R
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected
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81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected
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- pyxen
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Re: Rejetting CVK30s where 2&3 mains are > 1&4
23 Dec 2009 13:31
Okay.. so now the question of size remains.
Is 108 to 115 too big of a jump, or should I go up to 112 on all 4? Z1E doesn't stock 112s, which is why I'm leaning to 115s, and it seems that going up by 5 is the norm...
Is 108 to 115 too big of a jump, or should I go up to 112 on all 4? Z1E doesn't stock 112s, which is why I'm leaning to 115s, and it seems that going up by 5 is the norm...
84 KZ550-F2 LTD
93 ZR550-B4
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- Nebr_Rex
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Re: Rejetting CVK30s where 2&3 mains are > 1&4
23 Dec 2009 14:25
try 110,raise the needle one groove,if no grooves one washer about 1/16 in.
2002 ZRX1200R
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected
www.dotheton.com/forum/index.php?topic=39120.0
.
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected
www.dotheton.com/forum/index.php?topic=39120.0
.
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- timebomb33
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Re: Rejetting CVK30s where 2&3 mains are > 1&4
23 Dec 2009 15:23
if you had to tape up the intake to get a decent burn then i'd want to make a major step in oppisite direction at least 2 or 3 sizes go for the 115's, 110's would be just taking baby steps that is clearly not what you need to do in this situation.
1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
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- pyxen
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Re: Rejetting CVK30s where 2&3 mains are > 1&4
24 Dec 2009 06:31
The middle two cylinders are already 110s, so I think 112 at the least. I'll order 4 115s from Z1E and see what happens (can't really ride it now anyways, since winter is in full effect up here.)
To be clear: I didn't tape up the intake, I taped the actual filter. I reduced the perforated surface area using duct tape.
To be clear: I didn't tape up the intake, I taped the actual filter. I reduced the perforated surface area using duct tape.
84 KZ550-F2 LTD
93 ZR550-B4
93 ZR550-B4
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