I'm replacing the stock air filter with a Uni and removing the snorkle cover. No other mods for now. Will this make enough of a difference to require a rejet? Also, what's the stock main jet size? I'm thinking I may want to go up 1 size.

 

When I talked to Trinity they told me that you could take off the lid and not have to re-jet, they said that the Zuki was jetted pretty rich and that it would be ok without a re-jet. I have heard people say that they needed to re-jet it after removing the cover. Sounds like you just need to try it to see what is best for you.

Balzak

 

i think they actually come jetting too lean. you should check your plug to after you do the mods to see if your lean or rich. i got a pipe, filter, airbox mods and am at 152.5 and am still too lean. 130 is stock.

 

I hate to disagree with my comrads at Trinity, but when we took off just the snorkle it made a big difference on the dyno. It ran like **** but this was also with the test pipe. You are on your own for this one.

 

I'm @ 5500ft and when I picked up mine at the dealer you could tell it was defintely rich, but the dealer said to try it out and bring it back if I needed a re-jet. I took it back and they jetted me to a 120 main. What a difference! It really hits now, but I would like to run without the airbox lid but I can't because as soon as I remove it and get on the gas it cuts out. Do you think the dealer went too lean? These jets come in increments of .25, so he stepped me down a total of 4 jet sizes.
Any thoughts?

 

Sounds to me they jetted you correctly. The stock exhaust and intake are very restrictive so when you start changing things it makes a big difference. Most people with a slip-on and snorkle removed are going from a 130 to a 152.5. Thats shows a big change.

 

I installed an Hmf slip on and the alba air filter with six 1" holes in the air box lid and put a 152.5 main jet in and after riding today I checked the plug and the electrode insulator was white so now I am going to try a 157.5 and see what happens hopefully I do not have to go much bigger as the 160 is as big a jet that I have right now. Does anybody know were to get the larger jets at as my dealer only had upto the 160.

Dads400

 

Any reputable shop will be able to order you one. If not just call any high performance shop or Mikuni direct and they should be able to assist you.

 

I tried removing the airbox lid last night and my Z cuts out and refuses to do anything it with it off. The only other thing I've done is I took the end cap off and increased the size of the hole in the baffle. Then I replaced the endcap and spark arrestor. I ride in the national forest and they write tickets around here. I think I'm going to go with the Alba airbox kit with the K&N and the yellow outerwear along with an HMF slip-on that includes the spark arrestor. Hopefully a 157 or 160 jet will work for me.

 

Dads400, What jetting did you end up with? I think I may need to go bigger on mine too.