Carburetor Jet Tuning - Updates on 1st Post

[roboto65]

Had a friend when I was a kid he was from there ..

[TLRam1]

I took mine to Colorado last July, the bike lost it's pep and I was in the 7000 -12,000 range. I didn't know how much until I came back down to a lower level. 

It's great to be talking to people in different country's.

[Chad in Michigan]

Found this article, it may help why changing the pilot works. It is geared for a harley, but they still use a kehin cv carb, similar in design to ours.

http://www.trak-tek.com/products/airCleaners/ramFlo/installation/cvCarbJetting.html

[roboto65]

Very interesting shows people how the slow and main work at idle and full throttle Cool!!!!!

[Justin]

Yah Awesome post, really helps to clarify how the CV carbs work.

[Magnatic]

I am a little confused again. I thought the pilot jet was next to the main jet and it does not "adjust" by
turning it in or out, it simply screws in like a main jet. The d-head fuel mixture screw is what you adjust,
is that not correct? Is it the mixture screw that some are changing out for a larger (42 or 45) size, or
is it the pilot jet that is being swapped and then re-adjusting the fuel mixture screw? Or am I just confused
about the terms being used? I want to be straight on all this before I try to get my bike running correctly
this weekend. Thanks again.//Matt

[TLRam1]

Matt,

It is the Pilot Jet being changed #42 or #45 and the fuel screw "D" shape is being adjusted. The Pilot Jet screws in and is non-adjustable other than changing to a different size.

[Magnatic]

OK, thanks for that Terry. I am ready to go with 110 and 112 mains and 42 and 45 pilots to
experiment with. I'll report back.

[TLRam1]

OK, thanks for that Terry. I am ready to go with 110 and 112 mains and 42 and 45 pilots to
experiment with. I'll report back.

Please do, anxiously waiting your report. 

[L J VFR]

Terry, Greg... do you guys think adding 105 mains to my bike will help it?  If it is a midrange issue it won't purtain to wide open throttle right??    Lance

[TLRam1]

Lance this is you correct?
___________________________________________________________________

Lance

K & N

Stock exhaust

Shims - 2 additional

Pilots screws out 2 3/4 turns

This helped my bike quite a bit, hardly any drop or stumble now at all.


Thanks Lance for your input.
_________________________________________________________________

I didn't understand your last question. Main Jets will help mid-range some as your Needle Jet (on some carbs) goes through and works from your Main Jet. Thus a larger main will allow more fuel to flow around your Needle Jet. I don't know how far down the Needle goes into these carbs.

Depends where your issue is?

[L J VFR]

It runs fine.  Just wondering if putting the 105 mains in would be worth the time of pulling carbs, and make it run even better.. ..Lance

[TLRam1]

I hear ya,

If it were me I would eventually do it but I am performance driven.    It did help the top end on mine. You could wait until a wrench session.

[lragan]

To each his own, of course, but I am of the school that "If it ain't broke, don't fix it!"

[Chad in Michigan]

It ain't broke, but can you make it better? That's my philosophy  I've got a soon to be fired co-worker that strictly follows that old addage. Doesn't fly in my line of work. 
105 Jets are not going to hurt top end, they will make it better in his case. Those jets came stock for the European bikes.

FYI, When you add pipes / air filter you should rejet, even if you think it's running correctly, or you're going to end up owning a Hardley Dependable bike one day after you burn a hole in the piston from running too lean.