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General Category >> Rubber Side Down! >> Pilotjet with and whitout holes??
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Message started by Henrik on 04/15/14 at 13:45:12

Title: Pilotjet with and whitout holes??
Post by Henrik on 04/15/14 at 13:45:12

Went away to the local dealer to get a new pilotjet (size 50). He gave me the one with the holes at the picture. (The one whitout is a stock 47,5).
The guy is an auctorised Suzuki mechanic, and he ensured me that it should fit anyway. Still i do not feel realy good about this. Is there anyone how knows that i would work?? (I trust this forum more than i trust the dealer guys.)
I have a 55 pilotjet at the moment and it is to rich so i really want to try to back down two steps.

Title: Re: Pilotjet with and whitout holes??
Post by Coaxial on 04/15/14 at 13:55:54

7479767B7D6A2A2F180 wrote:

You can interchange them, the ones with the holes give a little better performance in the lower rpm ranges...at least I think so.
The stock pilot , without bleed holes, are Mikuni # N151.067
The others, with bleed holes, are Mikuni #BS30/96

The numbers for either type are the same ... size 50=size 50

7B76797472652520170 wrote:

The pilot jets with and without the bleed holes flow the same amount of fuel.
Same size hole in the base of the jet = same amount of fuel flow.
The difference is that the bleed hole design is supposed to allow for a better transition from low to midrange throttle settings.
Some like it, others don't feel a difference.
I felt like I could feel a difference in throttle reponse and so I use them.
Strangely enough, the non-bleed jets cost almost 2x the bleed type.
Not sure why, but they do.

bleed: $3.68
non-bleed: $5.78

Title: Re: Pilotjet with and whitout holes??
Post by Dave on 04/15/14 at 13:59:35

The bleed holes don't make any diffence on the Savage carb.....it will work the same. The CV carb on the Savage has an idle fuel screw and the bleed holes are not connected to anything.

The bleed holes are used on some carbs for adjusting the idle air mixture. The Mikuni roundslide carbs have idle air screws.....and when you are adjusting the idle air it changes how much air comes through the bleed holes and mixes with the fuel that is being metered through the pilot jet.

The easy way to tell the diffence between an idle fuel mix screw and an idle air mix screw.....is that if the screw is on the engine side of the slide (vacuum) it controls fuel flow - if the screw is on the air cleaner (inlet) side of the slide it controls air flow.

So.......the long answer is.....go ahead and use the pilot jet with the metering holes as the Savage carb doesn't care.

Title: Re: Pilotjet with and whitout holes??
Post by Henrik on 04/15/14 at 14:02:39

I will try it out, thanks!

Title: Re: Pilotjet with and whitout holes??
Post by Dave on 04/15/14 at 14:19:24

And if you want to see how the air holes are used...click on this link and notice on the 3rd page. The mixture screw is called an "air screw", and if you follow the route of the air to the cross secition on the right side of the page you will see the air enters the bleed holes in the side of the pilot jet...while the fuel is being pulled up into the bottom of the jet.
http://www.mikuni.com/pdf/vmmanual.pdf

The CV carb doesn't work that way. The fuel is pulled up through the bottom of the piot jet, and the screw adust the fuel rate that will flow out the tiny hole on the engine side of the butterfly throttle plate.

Title: Re: Pilotjet with and whitout holes??
Post by verslagen1 on 04/15/14 at 14:30:22

according to some, the bleed holes make the jet slightly richer.

Title: Re: Pilotjet with and whitout holes??
Post by Dave on 04/15/14 at 15:08:57

796A7D7C636E686A613E0F0 wrote:

according to some, the bleed holes make the jet slightly richer.

I don't know how that is possible....the holes don't connect to anything when the pilot jet is on the CV carb. The carb casting is just a round smooth barrel around the pilot jet, and the fuel flows up through the bottom of the pilot jet, and the metering portion is at the top.

On the VM carb that area around the pilot jet has an air channel connected to the air screw....and air is metered into those holes.

When I had the O2 sensor on my bike I tried a pilot jet with and without bleed holes....and I could not see any difference.

I might see if I can find someone at Mikuni to straighten this out for us, as I have seen lots of other forums where the bleed holes are a source of controversy.

Title: Re: Pilotjet with and whitout holes??
Post by verslagen1 on 04/15/14 at 15:22:37

Just reporting what others have said.

Title: Re: Pilotjet with and whitout holes??
Post by Serowbot on 04/15/14 at 16:07:48

584B5C5D424F494B401F2E0 wrote:

Just reporting what others have said.

... chrome makes my bike faster.... ;D...

Title: Re: Pilotjet with and whitout holes??
Post by Steve H on 04/16/14 at 04:13:46

Chrome makes everything faster ;D