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Message started by Bubba on 04/12/10 at 11:09:15

Title: Bleed holes?
Post by Bubba on 04/12/10 at 11:09:15

Just a couple quick questions...how do the bleed holes work on a pilot jet?
My bikes running great these days (except when it's cold) and I'm at a mile high. Jetting actually seems pretty good except I don't have much on the high end of the throttle.
I run - Pretty open pipe, stock jets, air screw out 2 1/4 turns, 1/2 spacer. I purchased Lancer's kit but haven't messed with anything yet. I was thinking of going up on one step on both the pilot and the main. One of the jets Lancer sent has bleed holes...how's that work?

Also, if I buy a Raptor petcock do I just cap the vac port on the carb?

Thanks a bunch

Title: Re: Bleed holes?
Post by Serowbot on 04/12/10 at 11:23:51

Quote:

Also, if I buy a Raptor petcock do I just cap the vac port on the carb?

Yes,.. just cap it... I used a screw, 'cause the rubber caps kept rotting away every couple of months...

...as far as the bleed holes.... I believe they are intended to make something do something better.... :-?...
... don't know if they really do though... ;D...

Title: Re: Bleed holes?
Post by bill67 on 04/12/10 at 11:36:09

744354545707060E05360 wrote:

You need a least a richer high speed jet to get the higher end power even a stock motorcycle needs richer jets than what comes in them.

Title: Re: Bleed holes?
Post by dasch on 04/13/10 at 00:03:09

From my personal experience, .50 idle with bleed holes was WAY too rich. .50 w/o holes is just about right. I am not 100 sure how and why, but they definitely bleed more gas through the jet.

Title: Re: Bleed holes?
Post by jabman on 04/13/10 at 01:42:55

i think we need lancer to clarify this issue :-?

Title: Re: Bleed holes?
Post by NewThumperGuy on 04/13/10 at 04:53:11

The pilot with the bleed holes made my 97 way to rich. Ended up going back to the one without and a 150 main.

Title: Re: Bleed holes?
Post by Routy on 04/13/10 at 05:57:11

At a mile high, you probably don't need any more fuel than what you have now. Jet only the range that needs jettin, if any.

And no matter how you jet, you ain't never goona have good high end power at 1 mile high. There just ain't enough air up there.

Title: Re: Bleed holes?
Post by Bubba on 04/13/10 at 07:41:21

Thanks everyone, I was thinking of leaving the pilot the way it is and maybe just putting in the next size up for the main.
The only reason I figured I'd mess with the pilot is because I'm 2 1/2 out on my air mix screw and I get some SERIOUS pop on shut down.
Funny thing is, if I turn my idle knob WAY down before I shut 'er off then...no pop!

Title: Re: Bleed holes?
Post by Digger on 06/01/10 at 21:43:49

576077777424252D26150 wrote:

......Also, if I buy a Raptor petcock do I just cap the vac port on the carb?.....

Here's another way to skin that cat:

http://i235.photobucket.com/albums/ee201/Digger109/CarbVacuumPortPlugE.jpg

I squirted a bit of RTV into the hose before folding it.

Title: Re: Bleed holes?
Post by LANCER on 06/02/10 at 03:59:44

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: Bleed holes?
Post by Bubba on 06/02/10 at 06:42:54

Thanks Lancer, here is what I have so far...fairly open pipe but it does have some resonator/baffle to create some back pressure, K&N drop in air filter.
I first replaced the stock spacer with a #4 nylon spacer from ACE, that eliminated the midrange surging I was getting when I first bought the bike.
Rode that way for a few months but didn't feel like I had any power on the upper throttle range (which I don't use much!) so I put in a 150 main from Lancer's kit....worked as expected (good!) although I was getting some serious POP on shut down.
Installed the 52.5 w/ bleed holes from Lancer. That seemed to help with some of the low end sputtering I was getting in cooler weather (although I really think that is the vac petcock which I'm replacing with a Raptor arriving tomorrow) and seems to have eliminated the POP on shut down. I also now have the air screw out only 2 turns which is good.
I sometimes get some afterfire when really winding it out between gears but really nothing to write home about.

I just took everyone's advice and went slow to see how the bike would react. So far it's been fun.
I think I'm very happy now!!!! :)

Title: Re: Bleed holes?
Post by LANCER on 06/02/10 at 15:06:40

sounds good; working it one point at a time and working through the issues.

Just as a side note, Mikuni suggests that in an ideal situation, if the pilot jet is the "best" size the screw would end up at about 1-1.5 turns out.
Changing the pilot jet one size should normally change the screw setting by one full turn.

Title: Re: Bleed holes?
Post by ralfyguy on 06/02/10 at 15:36:53

I run the stock 52.5 and I'm at 2 1/4 turns out. I tried a 55 with bleed holes and the screw had to be all the way in and still ran too rich. So I went back to the 52.5.

Title: Re: Bleed holes?
Post by DrunkenDwarf on 06/02/10 at 17:55:01

5558575A5C4B0B0E390 wrote:

Just as a side note, Mikuni suggests that in an ideal situation, if the pilot jet is the "best" size the screw would end up at about 1-1.5 turns out.
Changing the pilot jet one size should normally change the screw setting by one full turn.

Just adding my name to this so I can find this information in the future. I've asked about this before and I'm glad there's an answer!

-D. Dwarf

Title: Re: Bleed holes?
Post by LANCER on 06/03/10 at 03:22:45

495A575D425C4E423B0 wrote:

I run the stock 52.5 and I'm at 2 1/4 turns out. I tried a 55 with bleed holes and the screw had to be all the way in and still ran too rich. So I went back to the 52.5.

that is strange

Title: Re: Bleed holes?
Post by Bubba on 06/03/10 at 06:57:17

I thought about trying the 55 pilot w/ bleed holes but figured I'd be too rich. Since I'm at a mile high I figure 2 turns out is just about right since I will probably only go higher from here.

I could easily gain 5000 ft in a day and my reasoning is that as I go up I'll be going richer. Having 2 turns out on the air screw gives me a little room to adjust as I climb.
Does that sound right????

Title: Re: Bleed holes?
Post by klx650sm2002 on 06/03/10 at 09:58:18

Yes that does sound right. On my FCR there is no choice all pilot jets have air bleed holes. I've gone from a 48 to a 45 and plan on going to a 42 to get the fuel screw in the middle of it's range.(FCR's also have an air screw to play with)
http://i119.photobucket.com/albums/o147/klx650sm2002/FCRpilots.jpg
Clive W :)

Title: Re: Bleed holes?
Post by ralfyguy on 06/04/10 at 10:39:50

2E232C2127307075420 wrote:

[quote author=495A575D425C4E423B0 link=1271095755/0#12 date=1275518213]I run the stock 52.5 and I'm at 2 1/4 turns out. I tried a 55 with bleed holes and the screw had to be all the way in and still ran too rich. So I went back to the 52.5.

that is strange[/quote]
I tried that twice on different days with different conditions, and it didn't work either time. I also swapped the 145 main to a 150 and she ran terrible at full throttle. Cutting out even. That was with a new stock air filter. Other than that she runs great and idles okay. Pulls hard and runs 95 flat out, getting there fairly quick. Idle set to about 1,200. Only strange thing is when I pinch the vac hose, idle goes up about 200. Let go and it goes back to normal. The vac line is new and dry though. Very strange.