Rejetting CVK30s where 2&3 mains are > 1&4

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23 Dec 2009 09:17 #340401 by pyxen
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! :)

84 KZ550-F2 LTD
93 ZR550-B4

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23 Dec 2009 11:28 #340409 by Nebr_Rex
Replied by Nebr_Rex on topic Rejetting CVK30s where 2&3 mains are > 1&4
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

www.dotheton.com/forum/index.php?topic=39120.0


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23 Dec 2009 13:31 #340419 by pyxen
Replied by pyxen on topic Rejetting CVK30s where 2&3 mains are > 1&4
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...

84 KZ550-F2 LTD
93 ZR550-B4

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23 Dec 2009 14:25 #340420 by Nebr_Rex
Replied by Nebr_Rex on topic Rejetting CVK30s where 2&3 mains are > 1&4
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


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23 Dec 2009 15:23 #340425 by timebomb33
Replied by timebomb33 on topic Rejetting CVK30s where 2&3 mains are > 1&4
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
I THINK MY POWERBAND BROKE

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24 Dec 2009 06:31 #340513 by pyxen
Replied by pyxen on topic Rejetting CVK30s where 2&3 mains are > 1&4
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.

84 KZ550-F2 LTD
93 ZR550-B4

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