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Message started by Bear on 02/24/09 at 16:50:46

Title: pilot jet
Post by Bear on 02/24/09 at 16:50:46

I changed the main and pilot jets in the carb today. Went from stock 145 main to 150. Changed pilot from 42.5 to 45.
Question - the stock pilot jet had no holes in the side. The replacement 45 has holes in the side. Does this make any difference? I put it in anyway. Looks the same except for the holes.

Title: Re: pilot jet
Post by diamond jim on 02/24/09 at 16:57:26

27372A312D2037450 wrote:

... the stock pilot jet had no holes in the side. The replacement 45 has holes in the side. Does this make any difference? I put it in anyway. Looks the same except for the holes.

Sounds like the brass bugs must have gotten into the bag and ate little holes in it. It should still work, though. ;D

That's exactly how it should be.

Title: Re: pilot jet
Post by Sandy Koocanusa on 02/24/09 at 17:18:57

It does make a difference. I put a "bleed" type pilot in mine (with the holes in it) and it ran way too rich. The same size non-bleed shaped things right up.

Just run it and see, but if you can't lean it down enough, that's a good place to start looking.

Title: Re: pilot jet
Post by dasch on 02/25/09 at 04:40:56

same thing happened to me. With holes - way to rich. No holes - just right.

Title: Re: pilot jet
Post by Bear on 02/26/09 at 16:07:01

I can't believe that 82 people read this post and nobody found my mistake. The stock pilot jet is 52.5 NOT 42.5. It took a bigger magnifiying glass and my reading glasses to read the tiny stamp on the jet. So I get to dismantle the carb again - this time I ordered a 55 pilot jet without holes in the side (some catalogs call them bleed holes others call them emulsion holes - whatever you call them, that is NOT the jet you want). You want the plain barrelled version.
I ordered mine thru motorcyclecarbs.com - no local dealer had any.
My local ACE hardware had replacement metric allen bolts for the float bowl and vacuum diaphram top. I wish they had been plated, they were just black steel. There were 3 on the top that took a LIGHT tap with an impact driver to get loose. The allen heads will solve that problem. I had a bigger problem with the needle retention screws to change out the famous white spacer. They are SOFT. Stripped the Phillips head off one, ordered new ones. Yes, I tired hard - was careful - used new sharp screwdriver - stripped anyway

Title: Re: pilot jet
Post by T Mack 1 on 02/26/09 at 18:30:40

20302D362A2730420 wrote:

Title: Re: pilot jet
Post by diamond jim on 02/26/09 at 18:30:44

Yep, we all caught it. We were just waiting to see what you'd do. :D

Title: Re: pilot jet
Post by Bear on 02/26/09 at 19:22:16

0C7515393B3369580 wrote:

[quote author=20302D362A2730420 link=1235523046/0#4 date=1235693221]I can't believe that 82 people read this post and nobody found my mistake. The stock pilot jet is 52.5 NOT 42.5. It took a bigger magnifiying glass and my reading glasses to read the tiny stamp on the jet. ........

We were waiting to see if you had more problems or if you were going to spend more money.

Soooooo...... Why are you changing the pilot jet????? You don't say what other MOD's you did.

I found that the larger jet was too much. I have the stock 52.5 but it's at the limit. The larger pilot was turned all the way in ..... I'm running a Harley Clone Screaming Eagle turn-out (Screaming Chicken???) that was too loud so it is now baffled down a bit. And stock air box. At approx 500 ft elevation (east-side PA).

Should we tell you that Lancer sells a full jet kit for less than $20. [/quote]

Stock 2008 S40 except for Harley Dyna muffler. After installing Dyna, it seemed to have low speed stumble a little until fully warmed up. Elevation 1300ft. Also plug was whitish and at full throttle, seemed to not have the same "pull". Plan to change the needle spacer to about half thickness. motorcyclecarbs.com has a set of washers for $6,

Title: Re: pilot jet
Post by Gamma742 on 02/26/09 at 20:42:27

Wow! I got the nylon washers at the local hardware store for .10 cents a washer. The ones I got from Lancer's Jet Set were metal :-/

Title: Re: pilot jet
Post by dasch on 02/27/09 at 00:58:17

Hm...stock on mine was 42.5, though.

Title: Re: pilot jet
Post by Bear on 02/27/09 at 14:39:56

515446565D350 wrote:

Hm...stock on mine was 42.5, though.

That is where I got confused. I read 42.5 in some manual and assumed that was what I had. When I took the actual stock jet out of my 2008 it was 52.5. Of course I bought one size bigger than 42.5 for the replacement and assumed I had the right thing. Wrong.
Lesson learned - before you go buying jets, know what you have to start with - READ THE STAMP WITH A BIG MAGNIFYING GLASS. If you buy a used bike - good luck - your carb may not be a virgin.