Kz750 VM28ss

Hello everyone, my project is now done. Ready for this summer. I would like to know what jet I should put in my VM28ss from Z1r in my KZ750 . Now I have 107.5 main and 15 pilot(vm28ss carb). Carburetor are freshly rebuilt, adjusted on point!! My Motor has a 0.5mm oversize, small porting, milled 0.006’’, pod filters, exhaust 4-1 w/o baffle !! Im located to Canada, quebec. My altidude is 400 meter..  I see some of you start with 117.5 main and 17 pilot, but I don’t know the altitude for these set up… ?!! 
Thank you so mich

You might want to contact member Zed, for some air correction jets.  That will make a huge improvement.   Also, make sure your pods are real deal K&N, or similar.  Cheap china pods sometimes lead to tuning problems.

Just to confirm the carbs in the included photo are not VM carbs. They are BS, vacuum slides. Completely different. Are you identifying your carb rack correctly?

Ok I will try to find these air corrector jet on ebay.. and what size of these one a need to put first ?! And Yes for the picture it was last year with The CV34mm !!

Maxbou92 wrote:

Ok I will try to find these air corrector jet on ebay.. and what size of these one a need to put first ?! And Yes for the picture it was last year with The CV34mm !!

www.kzrider.com/forum/forum-index/23-for...-round-slide-mikunis

Maxbou92 wrote:

Ok I will try to find these air corrector jet on ebay.. and what size of these one a need to put first ?! And Yes for the picture it was last year with The CV34mm !!

Post a current picture I’m sure the group would like to see the transformation. 

Thank you, do you think that the bike will be more powerful with these carbs and run better? The CV one was very hard to tune and I was not happy at all to ride it.. 

Maxbou92 wrote:

Thank you, do you think that the bike will be more powerful with these carbs and run better? The CV one was very hard to tune and I was not happy at all to ride it.. 

 

Switching from the CV34's to VM28's will probably not give you a performance increase. I guess it depends on how badly it was running with those CV carbs.

VM28's are not a "performance" carb like a smooth bore or a flat slide which do have a "bolt on" HP increase associated.

Most times poor performance may be due to other engine issues (no valve clearance, low compression, etc) but owners always assume it to be a carb issue.

A 110 main and a 15/17.5 pilot sounds about right for pods/pipe on a 750, but 117.5 is way too big for a stock 750.

There are jetting recommendations for altitude but generally that only applies if you go past 1000 feet (300M) in elevation gain so you could stick to a stock setting.

My engine is brand new!! Valves are in specs and 150psi on each cylinders!! Thank you!! I have a 17.5 pilot now and 117.5 for starting

With pods the aircorrected jets was spot on for me!

Can you tell me how to install these jets and what kind I need ?! If I put on dyno, does the guys need it for a good tune ?

Maxbou92 wrote:

Can you tell me how to install these jets and what kind I need ?

A link to the person selling the Air Correction jets was already provided to you in this thread...