KymcoForum.com

Scooters - 50cc => People 50 => Topic started by: Chachivoodoo on December 07, 2010, 04:09:57 AM

Title: Keihin Main Jets
Post by: Chachivoodoo on December 07, 2010, 04:09:57 AM
Colder weather, and I want to fatten up the Main Jet on my scoot.

Anyone know where to get my hands on a 90 or larger Main Jet for a Keihin for this 2005 People 50cc 2 Stroke?

Thanks-
Title: Re: Keihin Main Jets
Post by: oswaldters on December 07, 2010, 04:11:15 AM
jetsrus.com is a good place.

They have a $7.49 flat shipping rate so you might want to load up on some different size jets in case you want to do some experimenting.
Title: Re: Keihin Main Jets
Post by: Chachivoodoo on December 07, 2010, 06:41:41 PM
My 2005 People 50cc 2 stroke has a Keihin carb.

I pulled the Main and the Pilot jet, and got out the micometer.

According to my measurements these are the series jets that will fit.

MAIN JET
OVERALL LENGTH = 7mm
HEAD DIAMETER = 5mm
THREAD MAJOR DIAMETER = 3.9mm
KEIHIN 99101-116

PILOT JET
OVERALL LENGTH = 28mm
HEAD DIAMETER = 5mm
THREAD DIAMETER = 4.9mm
KEIHIN N424-74C

These are availbale at the following web site.

http://www.jetsrus.com/FAQ_identify_that_jet.htm (http://www.jetsrus.com/FAQ_identify_that_jet.htm)

I hope this helps anyone looking to re-jet your bike!
Title: Re: Keihin Main Jets
Post by: thebatman on December 07, 2010, 10:26:45 PM
IT CAN BE EASIER JUST TO DRILL YOUR OWN JETS ;).......if i can.....anybody can... :D :D ::) ;)
Title: Re: Keihin Main Jets
Post by: oswaldters on December 07, 2010, 10:59:13 PM
Damn, I've gotta rejet too.

This cold air is killing my speed - taking a bunch off the top end.

Time for a bigger jet....
Title: Re: Keihin Main Jets
Post by: thebatman on December 07, 2010, 11:44:23 PM
everybody needs to be sure to do those plug chops... ;).....myself included... ;).. i have seen where in some places, ppl have to DOWNJET instead of upjetting... i dont know but i seen it happen... i, of course, get to up,up,up jet ::) :D... i know i have shot up almost 3 sizes since cooler weather hit...so far.. ;)
Title: Re: Keihin Main Jets
Post by: oswaldters on December 07, 2010, 11:48:08 PM
The real problem is it's too cold outside to work on the scoot!

But yes, I really need to get at it - if it gets any colder I'll be pushing the scoot up the hills.
Title: Re: Keihin Main Jets
Post by: Rianna on December 08, 2010, 01:25:35 AM
23 degrees here today, oswaldters...brrrrr...too cold for outdoors work now! I reckon next year I'll know to get around to it earlier.
Title: Re: Keihin Main Jets
Post by: oswaldters on December 08, 2010, 01:27:59 AM
It's supposed to get into the teens next week. 

This cold has knocked a good 5mph off my top end.  And it's only going to get colder.

Title: Re: Keihin Main Jets
Post by: Rianna on December 08, 2010, 01:33:58 AM
OH, Man...that lost 5mph means you'll be out in the cold longer! You need to get them jets swapped!!

So much for the folks that said we'd have a mild winter on the east coast this year. It's already looking like a bitter one and it's not even officially winter yet! (21 degrees now :'( )

Wow...the teens...I feel for y'all everyday riders in those temps!! Hope Santa brings y'all some extra long johns this year! :D
Title: Re: Keihin Main Jets
Post by: oswaldters on December 08, 2010, 01:38:27 AM
21 degrees now

That doesn't help, nor does the 25mph wind from the north.

I think a bunch of us will be looking at upping the size of our main jets.
Title: Re: Keihin Main Jets
Post by: Rianna on December 08, 2010, 01:48:04 AM
I know that's right!

I reckon I'm just outta luck this year, though. I got sidetracked and didn't get around to it soon enough. There's just no way I can do it outdoors now. Next year I'll plan ahead. I'll have some proper riding gear and some jets ready for my 2nd winter with the scoot...unless I move south before then that is.
Title: Re: Keihin Main Jets
Post by: lankeeyankee on December 08, 2010, 02:34:43 AM
I know that's right!

I reckon I'm just outta luck this year, though. I got sidetracked and didn't get around to it soon enough. There's just no way I can do it outdoors now. Next year I'll plan ahead. I'll have some proper riding gear and some jets ready for my 2nd winter with the scoot...unless I move south before then that is.

No heated garage? Simple, an old blanket roll her up into the living room! Ahhh the smell of fresh gas and coffee in the morning watching the morning news!
Title: Re: Keihin Main Jets
Post by: oswaldters on December 08, 2010, 02:37:53 AM
I like your thinking Yankee -

I'm not allowed to bring the scoot inside (wife doesn't roll that way).

However, if I happen to be off work next Friday and nobody is here....

makes me wonder,iIf a scoot get a bigger jet in the living room and the wife isn't there to see it, does it make a sound?  ;D
Title: Re: Keihin Main Jets
Post by: Rianna on December 08, 2010, 02:43:19 AM
Sh*t, lankeeyankee, you tellin' on me now...you know she's sitting in my living room now on an old corrugated shipping box I cut open! :D

My arthritis don't like this cold weather no way...that's why I plan to move south again this coming year. ;)
Title: Re: Keihin Main Jets
Post by: Rianna on December 08, 2010, 03:13:25 AM
does it make a sound?

Uh-Oh...you and your scoot both gonna be out in the cold if it does!! :D
Title: Re: Keihin Main Jets
Post by: oswaldters on December 08, 2010, 03:16:09 AM
I was going to say 'does it make an oil stain' but with my luck that would happen and I'd be sleeping in the shed for the next month.
Title: Re: Keihin Main Jets
Post by: Rianna on December 08, 2010, 03:21:06 AM
'does it make an oil stain'

Shhhh...don't jinx yourself!

I can see it now...

Next weekend oswaldters gonna be typing like...

Brrrrrrrrrrrrrrrrrrrrrrrrr...it'sssss sooooooo danggggggggggggg colddddd outtttt hereeeee in the doghouseeeeeeeeee, butttttttttttttt theeeeeeeeee scootttttttttttttt isssssss runninggggggggggggggg greatttttttttttttt!!!!!!!!!!

...'cause his frozen fingers are sticking to the keyboard...
Title: Re: Keihin Main Jets
Post by: thebatman on December 08, 2010, 11:50:55 AM
i can feel you there... dont ya know, my scoot been in the living room for a week and a half... :D..... oh its 0 at my house this a.m...13 w/o the windchill....sux asss
Title: Re: Keihin Main Jets
Post by: Rianna on December 08, 2010, 04:08:06 PM
Dang, bat...that's COLD! :o I'm seriously considering moving my old spare washer and dryer out of the laundry room to make more room and rolling the scoot in there away from all the computers. Might could sit on the couch and watch the news again. ::) Could easily run some extra heat in there and get 'er ready to roll. Expecting a warm spell here come Friday (lower 40's...lol :D)...



Title: Re: Keihin Main Jets
Post by: thebatman on December 08, 2010, 04:21:57 PM
you may want to consider that...that way you got heat, tunes, etc.. my scoot likes sleeping inside... :D
Title: Re: Keihin Main Jets
Post by: oswaldters on December 08, 2010, 11:07:30 PM
my scoot likes sleeping inside

I know my scoot would like sleeping inside too...

However, I like sleeping inside even more and if the scoot goes in, I go out! :o

Sorry scoot, banished to the carport for life.
Title: Re: Keihin Main Jets
Post by: oswaldters on December 08, 2010, 11:13:12 PM
Hey Chachivoodoo,

let us know how those jets fit on your scoot.

I think a couple of people have had problems with the Keihin jets fitting on their agility because the threads are different.

May not be an issue for the People though.
Title: Re: Keihin Main Jets
Post by: lankeeyankee on December 08, 2010, 11:27:34 PM


I'm not allowed to bring the scoot inside (wife doesn't roll that way).



Making note to myself 981,912,005 reason not to get married. LOL!!
I use my kitchen oven to powder coat parts, the dishwasher for cleaning engine parts, etc. LOL!

Title: Re: Keihin Main Jets
Post by: oswaldters on December 09, 2010, 12:00:25 AM
And the funny thing is that in the real world, people would think my wife is perfectly reasonable in her demands that I not bring the scoot in the house.   ???
Title: Re: Keihin Main Jets
Post by: Rianna on December 09, 2010, 01:02:50 AM
I use my kitchen oven to powder coat parts, the dishwasher for cleaning engine parts, etc. LOL!

Ha! I thought I was the only one that had a multipurpose dishwasher! Haven't tried that one though...yet. LOL

real world

Whatcha sayin' there, oswaldters?? :D
Title: Re: Keihin Main Jets
Post by: thebatman on December 09, 2010, 03:22:26 AM
And the funny thing is that in the real world, people would think my wife is perfectly reasonable in her demands that I not bring the scoot in the house.   ???
                ;)   you have a point there os, MANY a women won't go for that either.... only reason i can ...is that... i be single ;D  :-\  ???  >:(
Title: Re: Keihin Main Jets
Post by: oswaldters on December 09, 2010, 03:29:58 AM
Shame because it's damn cold out for this time of year and it would be nice to have a warm scoot for the morning so I don't have to spend so much time warming it up.

Not to mention the difficulty in working on the scoot when its below 20 degrees out.

Title: Re: Keihin Main Jets
Post by: Chachivoodoo on December 09, 2010, 01:36:09 PM
Hey oswaldters-

Once I get the jets, I'll go ahead and post my findings about the fit.

I'm almost positive they will fit since I did the micrometer measurements myself.

Either way, I'll let you know.

Cheers-
Title: Re: Keihin Main Jets
Post by: oswaldters on December 09, 2010, 11:03:18 PM
No doubt they'll fit fine.

Maybe Word got the only oddball carb?
Title: Re: Keihin Main Jets
Post by: Rianna on December 10, 2010, 12:54:03 AM
I found a sticker on my scoot with the 'odd' numbers on it,  oswaldters. The sticker wasn't on the carb, though, it had been moved. So I guess I won't know for certain until I take a look at it.
Title: Re: Keihin Main Jets
Post by: oswaldters on December 10, 2010, 12:57:02 AM
Yeah, with my luck I've go the odd carb as well.

I hope to find out in the next couple of weeks when I get around to checking it out.
Title: Re: Keihin Main Jets
Post by: Rianna on December 10, 2010, 01:03:17 AM
You'll probably find out before me, oswaldters. I'm not doing much of anything in this 20 degree weather.
Title: Re: Keihin Main Jets
Post by: oswaldters on December 10, 2010, 01:06:00 AM
Well, if it stays this cold then I'll have to think about changing that pilot jet too.
Title: Re: Keihin Main Jets
Post by: Rianna on December 10, 2010, 01:08:04 AM
Well, if you do that, what would you change it to?
Title: Re: Keihin Main Jets
Post by: oswaldters on December 10, 2010, 01:11:16 AM
That's a good question - I'd have to check the size of it now - I think something like a #35 but I'm totally guessing.
Title: Re: Keihin Main Jets
Post by: Rianna on December 10, 2010, 01:12:25 AM
Yeah, the original slow jet is supposed to be a #35...
Title: Re: Keihin Main Jets
Post by: oswaldters on December 10, 2010, 01:14:13 AM
So I might go up a size on that.

But the main jet is the first thing I have to deal with.
Title: Re: Keihin Main Jets
Post by: Rianna on December 10, 2010, 01:16:44 AM
I see. I don't know about where  you're at but it's "supposed" to be in the 40's here tomorrow. I'm really hoping it does.
Title: Re: Keihin Main Jets
Post by: oswaldters on December 10, 2010, 01:19:41 AM
I think high 30s maybe.  

A veritable heatwave, I may have to wear my shorts to ride in.
Title: Re: Keihin Main Jets
Post by: Rianna on December 10, 2010, 01:22:30 AM
:D Shorts!! Better U than me!! :D
Title: Re: Keihin Main Jets
Post by: Chachivoodoo on December 19, 2010, 10:16:24 PM
I received the Jets, they were correct, and fit.

I installed a 38 Pilot Jet and a 90 Main Jet.

I adjusted the mixture with the air screw after it was warmed up.

Set the air screw at about 1-1/4 out.

Starts much easier now.

There was a little bit of a stumble in the bike in the midrange until it got warmed up.

Runs fine, looks like i'm all set until the summer comes back, then I'll probably drop the main jet to an 85.

We will see.
Title: Re: Keihin Main Jets
Post by: oswaldters on December 20, 2010, 12:21:07 AM
Glad to hear everything worked out.

Thanks for keeping us updated - this info is helpful in my quest to get my carb working better.
Title: Re: Keihin Main Jets
Post by: Rianna on December 20, 2010, 02:32:15 AM
That's great, Chachivoodoo. Now you're ready to roll!

I'm glad they fit for ya!
Title: Re: Keihin Main Jets
Post by: bniesen on March 22, 2011, 03:37:59 PM
Isn't #85 the stock size, at least that what it says in the manual. Has anyone tried restricting the air flow instead of changing out the jets?? In colder weather air is more dense so if the mixture is too lean then couldn't you just restrict the air flow?

Maybe I'm just stupid.