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Next: Trident shock
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External
Since: Sep 25, 2005
Posts: 5
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(Msg. 1) Posted: Sun Sep 25, 2005 11:41 am
Post subject: Help! Jetting for '02 CR125
Archived from groups: rec>motorcycles>dirt (more info?)
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I have new fairly new 2002 cr125 about 30hrs on it.
All was ok but now I ride in Gorman, CA which is about 4,000ft ASL.
Now the bike feels rich. it hesitates off idle.
Changed the Main Jet from 400 to 380, Air Screw turned from 2 1/8 to 2
1/2 (according to table in honda manual).
Now engine bogs or almost dies off idle (at about 1/4 to 1/2 or 3/4)
throttle. From what I understand needle is lean but plugs are still so
wet and soot black!!!
WHen I say bogs, off idle from standstill, when I throttle to about 1/4
to 1/2 engine goes 'booowwwwwww' almost dies, then I release the
throttle, idles nice again. WHen I richen the air screw the bogging
lessens (but richen the mixture more).
Bike idles perfectly though, at full throttle it feels rich.
I followed the manual suggested jets but still feels rich but bogs at
1/4 to 3/4.
SHould I change the pilot jet? (air filters are clean and no air leaks). |
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External
Since: Mar 07, 2005
Posts: 28
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(Msg. 2) Posted: Sun Sep 25, 2005 8:12 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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<tabbyf.TakeThisOut@hotmail.com> wrote in message
news:1127673716.461245.215390@f14g2000cwb.googlegroups.com...
>I have new fairly new 2002 cr125 about 30hrs on it.
>
> All was ok but now I ride in Gorman, CA which is about 4,000ft ASL.
> Now the bike feels rich. it hesitates off idle.
> Changed the Main Jet from 400 to 380, Air Screw turned from 2 1/8 to 2
> 1/2 (according to table in honda manual).
>
> Now engine bogs or almost dies off idle (at about 1/4 to 1/2 or 3/4)
> throttle. From what I understand needle is lean but plugs are still so
> wet and soot black!!!
> WHen I say bogs, off idle from standstill, when I throttle to about 1/4
> to 1/2 engine goes 'booowwwwwww' almost dies, then I release the
> throttle, idles nice again. WHen I richen the air screw the bogging
> lessens (but richen the mixture more).
>
> Bike idles perfectly though, at full throttle it feels rich.
>
> I followed the manual suggested jets but still feels rich but bogs at
> 1/4 to 3/4.
>
> SHould I change the pilot jet? (air filters are clean and no air leaks).
Yes.
Tim H |
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External
Since: Mar 30, 2005
Posts: 494
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(Msg. 3) Posted: Sun Sep 25, 2005 8:59 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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External
Since: Mar 07, 2005
Posts: 375
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(Msg. 4) Posted: Mon Sep 26, 2005 6:15 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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External
Since: Sep 25, 2005
Posts: 5
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(Msg. 5) Posted: Wed Sep 28, 2005 10:56 am
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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Thanks for the replies.
Right now the pilot jet is stock (#32.5). I'll buy and try out #30 this
weekend.
Oh! I forgot to mention, I installed an FMF Q (spark
arrester+silencer). With this muffler does it rich/lean the mixture? I
assume it richens the mixture as this is not as free flowing as the
stock muffler.
MX Tuner wrote:
> On 25 Sep 2005 20:59:19 -0700, "oldfart" <adavidg.TakeThisOut@peoplepc.com>
> blathered:
>
> >Go down on the main one more size.
>
> I wouldn't do that until he gets the pilot circuit straightened out.
>
> MX Tuner >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Sep 25, 2005
Posts: 5
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(Msg. 6) Posted: Wed Sep 28, 2005 11:02 am
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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One more thing, I was thinking of inspecting the float level and
condition of the reeds but the bike is almost new (30 hrs on it). So
I'll skip that. Any tips on making this bike run great is greatly
appreciated! Thanks. >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Mar 07, 2005
Posts: 375
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(Msg. 7) Posted: Wed Sep 28, 2005 5:42 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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On 28 Sep 2005 11:02:24 -0700, tabbyf DeleteThis @hotmail.com blathered:
>One more thing, I was thinking of inspecting the float level and
>condition of the reeds but the bike is almost new (30 hrs on it). So
>I'll skip that. Any tips on making this bike run great is greatly
>appreciated! Thanks.
You may end up going a lot leaner than a 30 pilot.
THe Mikuni's are sensitive to the float level being set right and it
takes a special tool that screws in the bottom of the bowl. I bought
mine from Yamaha.
MX Tuner >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Sep 25, 2005
Posts: 5
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(Msg. 8) Posted: Fri Sep 30, 2005 11:55 am
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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When the place where you ride goes higher the mixture goes Richer then
why does my bike goes 'booooowaaaaang'? This happens when I whip the
throttle from idle to about 1/2.
Is that 'boooowaaaang' a sign of lean mixture? I'm asking this because
since my altitude increased that shouldn't go 'booowaang' but just
crackle due to the rich mixture?
I was thinking of getting a leaner needle jet but it costs about $12
per jet. >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Oct 09, 2005
Posts: 2
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(Msg. 9) Posted: Sun Oct 09, 2005 10:31 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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I installed the the #30 jet. It runs better now.
Looking at the original #32.5 jet and comparing it with the #30, the
#30 seems to have bigger holes??
Going down a number in the pilot jet means going leaner right? I hope I
was imagining things. >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Mar 07, 2005
Posts: 375
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(Msg. 10) Posted: Mon Oct 10, 2005 5:36 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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On 9 Oct 2005 22:31:25 -0700, "Tabby Francisco" <tabbyf.TakeThisOut@gmail.com>
blathered:
>I installed the the #30 jet. It runs better now.
>Looking at the original #32.5 jet and comparing it with the #30, the
>#30 seems to have bigger holes??
The only hole that matters is the one that runs down the center, not
the ones along the sides.
>Going down a number in the pilot jet means going leaner right?
Yup.
MX Tuner >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Oct 09, 2005
Posts: 2
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(Msg. 11) Posted: Sun Nov 06, 2005 3:37 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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After installing the #30 pilot jet the '02 CR125r is still bogging
down.
Bogging: At standstill, when I throttle up at 1st gear, when the bike
starts to move, the engine almost dies when I give it load. My solution
is rev it up to about 4k and feather the clutch to get is moving.
This even becomes a bigger problem when i'm on a uphill trail starting
from standstill. It's impossible!
I marked the throttle grip and it indicates the bogging occurs before
1/4 throttle.
Does the bogging is caused by too lean or too rich of a pilot jet (or
airscrew)?
MX Tuner wrote:
> On 9 Oct 2005 22:31:25 -0700, "Tabby Francisco" <tabbyf RemoveThis @gmail.com>
> blathered:
>
> >I installed the the #30 jet. It runs better now.
> >Looking at the original #32.5 jet and comparing it with the #30, the
> >#30 seems to have bigger holes??
>
> The only hole that matters is the one that runs down the center, not
> the ones along the sides.
>
> >Going down a number in the pilot jet means going leaner right?
>
> Yup.
>
> MX Tuner >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Mar 30, 2004
Posts: 754
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(Msg. 12) Posted: Mon Nov 07, 2005 12:55 am
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Most likely, if compression is good, the condition is caused by a lean
condition. If the pilot jet is large enough, then try running it after
moving the needle clip down one groove.
Jim
Smackover Racing
Gas Gas DE300
Team LAGNAF
www.smackovermotorsports.com
>On 6 Nov 2005 15:37:11 -0800, "Tabby Francisco" <tabbyf.TakeThisOut@gmail.com> wrote:
>After installing the #30 pilot jet the '02 CR125r is still bogging
>down.
>Bogging: At standstill, when I throttle up at 1st gear, when the bike
>starts to move, the engine almost dies when I give it load. My solution
>is rev it up to about 4k and feather the clutch to get is moving.
>
>This even becomes a bigger problem when i'm on a uphill trail starting
>from standstill. It's impossible!
>
>I marked the throttle grip and it indicates the bogging occurs before
>1/4 throttle.
>
>Does the bogging is caused by too lean or too rich of a pilot jet (or
>airscrew)?
>
>
>MX Tuner wrote:
>> On 9 Oct 2005 22:31:25 -0700, "Tabby Francisco" <tabbyf.TakeThisOut@gmail.com>
>> blathered:
>>
>> >I installed the the #30 jet. It runs better now.
>> >Looking at the original #32.5 jet and comparing it with the #30, the
>> >#30 seems to have bigger holes??
>>
>> The only hole that matters is the one that runs down the center, not
>> the ones along the sides.
>>
>> >Going down a number in the pilot jet means going leaner right?
>>
>> Yup.
>>
>> MX Tuner >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Mar 07, 2005
Posts: 375
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(Msg. 13) Posted: Tue Nov 08, 2005 5:57 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Mon, 07 Nov 2005 04:33:10 GMT, Wudsracer
<dirtbike52RemovE DeleteThis @sbcglobal.net> blathered:
>Most likely, if compression is good, the condition is caused by a lean
>condition. If the pilot jet is large enough, then try running it after
>moving the needle clip down one groove.
I'm beginning to wonder if it is bogging or just being a 125. The CR
is the slowest 125 made of that era. It won't have much hill climbing
power below about 8,000 rpms.
MX Tuner >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Sep 25, 2005
Posts: 5
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(Msg. 14) Posted: Mon Nov 21, 2005 5:20 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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Finally the CR125R is running like it should. The problem is I've done
two things to the bike & I don't know what eliminated the bogging.
1. Top-end rebuild. I replaced the piston, ring, pin, needle bearing
and gaskets. Decarbonized the exhaust valves.
2. Installed back the original pilot jet of #32.5
Found out also that the reeds are still in new condition (carbon
fiber).
What I've read is that when the engine loses compression, the engine
lose low-end power (aka bog down) and takes time to hit its top end.
The old piston still looks fine, no blowby below the rings, no scuff
marks on the cylinder.
My new concern now is that the one of the cylinder bolt/stud and its
dowel is rusted. I had to shake the cylinder like crazy to lift it out.
How do you remove those bolt/stud? Do you just unscrew them
counter-clockwise (with a vise-grip i suppose)? >> Stay informed about: Help! Jetting for '02 CR125 |
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External
Since: Mar 07, 2005
Posts: 375
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(Msg. 15) Posted: Tue Nov 22, 2005 5:42 pm
Post subject: Re: Help! Jetting for '02 CR125 [Login to view extended thread Info.]
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On 21 Nov 2005 17:20:48 -0800, tabbyf.TakeThisOut@hotmail.com blathered:
>My new concern now is that the one of the cylinder bolt/stud and its
>dowel is rusted. I had to shake the cylinder like crazy to lift it out.
>How do you remove those bolt/stud? Do you just unscrew them
>counter-clockwise (with a vise-grip i suppose)?
That is known as dissimilar metal electrolysis. Applying a small
amount of grease or anti-seize will reduce/eliminate it without
replacing any parts. It is very common.
MX Tuner >> Stay informed about: Help! Jetting for '02 CR125 |
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