🚀 go-pugleaf

DUH!   Forgot to mention...   My bike is a 1998 YZ 250


"BadCRC" <BadCRC@bbbbrrrrRrrRrrRraaapppPPP.com> wrote in message
news:3f037787@shknews01...
> Hello all!  I'm looking for some help...  I'm fouling plugs due to rich
> jetting.
>
> Long story short....   I have a PC pipe and silencer ("Factory Sound"),
> Boyesen power reeds, and use No-Toil filters and oil, other than that, the
> engine is stock.  I am running MX2T premix at 32:1 with pump swill.  Temp
is
> around 80, elev. 5000.
>
> My question is this...  When I got the bike it had a 55! pilot (who knows
> why), 172 main, clip 2nd from top.  The stock settings are 48 pilot, 172
> main and 2nd clip from top.  I changed it to (stock) 48 pilot, 170 main,
2nd
> clip (left the same).  Before I changed anything it fouled like CRAZY!
Now
> it is still fouling but not as often.
>
> My question is this...  It seems like I foul when first getting going, and
> my plugs are always black (no matter if I foul them right away or after
> riding for an hour).  Would I be okay to go to a 45 pilot without worrying
> too bad about being too lean?  Seeing as how 48 is stock.
>
> Anyway, I know there is a lot to getting it to run just right, I just want
> to know if you guys/gals think I will be running the risk of damaging
> anything by going 3 sizes smaller on my pilot.  (45 is the next lowest my
> dealer had, and I'm going out this weekend.)
>
>
> Thanks in advance!!  You guys are great!
>
>
> BadCRC
>
>

In article <3f037787@shknews01>, "BadCRC"
<BadCRC@bbbbrrrrRrrRrrRraaapppPPP.com> wrote:

> Hello all!  I'm looking for some help...  I'm fouling plugs due to rich
> jetting.
>
> Long story short....   I have a PC pipe and silencer ("Factory Sound"),
> Boyesen power reeds, and use No-Toil filters and oil, other than that, the
> engine is stock.  I am running MX2T premix at 32:1 with pump swill.  Temp is
> around 80, elev. 5000.
>
> My question is this...  When I got the bike it had a 55! pilot (who knows
> why), 172 main, clip 2nd from top.  The stock settings are 48 pilot, 172
> main and 2nd clip from top.  I changed it to (stock) 48 pilot, 170 main, 2nd
> clip (left the same).  Before I changed anything it fouled like CRAZY!  Now
> it is still fouling but not as often.
>
> My question is this...  It seems like I foul when first getting going, and
> my plugs are always black (no matter if I foul them right away or after
> riding for an hour).  Would I be okay to go to a 45 pilot without worrying
> too bad about being too lean?  Seeing as how 48 is stock.
>
> Anyway, I know there is a lot to getting it to run just right, I just want
> to know if you guys/gals think I will be running the risk of damaging
> anything by going 3 sizes smaller on my pilot.  (45 is the next lowest my
> dealer had, and I'm going out this weekend.)
>

Just to compare, my '99 YZ250 is currently running:
45 pilot (std. is 50)
170 main (std. is 172)
N4DF jet needle @ 1st clip (this needle is one step leaner than std.; as near as
                            I can tell, it is .5 step leaner than running the
                            std. jet needle at the first clip)

Its using an FMF pipe/Turbine Core II sa/silencer, No-Toil filter oil, and
Boyesen power reeds, with Yamalube-2R at 36:1, Chevron 91 gas. Pretty
similar to yours.

I took it up to Foresthill, CA a couple weeks ago during a hot spell.
Elev. about 4500 feet, maybe less, temp around 85. Ran richer than
Saddam's closet. I'm a little surprised that it is still too rich, and
it's caused me to wonder whether I've got a transmission seal leak. I
built a crankcase pressure test system last week, and the crankcase never
leaked  even .1 psi during 2 tests, but now I've got to rule out a vacuum
leak. Other than that, I can only keep going leaner with jetting.

I'm sure others here with a lot more experience will check in (I hope),
but I don't think you should worry at all about going to a 45 pilot. Most
of the advice I've gotten here is to start with the pilot circuit, then go
to the jet needle, and then last fiddle with the main; Boyesen recommends
the opposite. There's been quite a bit on this newsgroup about jetting,
try a google groups search to catch up a bit.

--
Charles
'99 YZF600R
'99 YZ250

On Wed, 2 Jul 2003 18:23:02 -0600, "BadCRC"
<BadCRC@bbbbrrrrRrrRrrRraaapppPPP.com> spewed forth:

>My question is this...  It seems like I foul when first getting going, and
>my plugs are always black (no matter if I foul them right away or after
>riding for an hour).  Would I be okay to go to a 45 pilot without worrying
>too bad about being too lean?  Seeing as how 48 is stock.

>Anyway, I know there is a lot to getting it to run just right, I just want
>to know if you guys/gals think I will be running the risk of damaging
>anything by going 3 sizes smaller on my pilot.  (45 is the next lowest my
>dealer had, and I'm going out this weekend.)

#1 Don't use plug color as an indicator for jetting.

#2 A 45 pilot is *one* step leaner than a 48. The next leaner is a 42.

#3 You won't do any engine damage going too lean on the pilot jet.

MX Tuner

In article <chNOstem-0207032121360001@user-38ldukf.dialup.mindspring.com>,
chNOstem@mindSPAMspring.com (Charles Stembridge) wrote:

> In article <3f037787@shknews01>, "BadCRC"
> <BadCRC@bbbbrrrrRrrRrrRraaapppPPP.com> wrote:
>
> > Hello all!  I'm looking for some help...  I'm fouling plugs due to rich
> > jetting.
> >
> > Long story short....   I have a PC pipe and silencer ("Factory Sound"),
> > Boyesen power reeds, and use No-Toil filters and oil, other than that, the
> > engine is stock.  I am running MX2T premix at 32:1 with pump swill.  Temp is
> > around 80, elev. 5000.
> >
> > My question is this...  When I got the bike it had a 55! pilot (who knows
> > why), 172 main, clip 2nd from top.  The stock settings are 48 pilot, 172
> > main and 2nd clip from top.  I changed it to (stock) 48 pilot, 170 main, 2nd
> > clip (left the same).  Before I changed anything it fouled like CRAZY!  Now
> > it is still fouling but not as often.
> >
> > My question is this...  It seems like I foul when first getting going, and
> > my plugs are always black (no matter if I foul them right away or after
> > riding for an hour).  Would I be okay to go to a 45 pilot without worrying
> > too bad about being too lean?  Seeing as how 48 is stock.
> >

>
> Just to compare, my '99 YZ250 is currently running:
> 45 pilot (std. is 50)
> 170 main (std. is 172)
> N4DF jet needle @ 1st clip (this needle is one step leaner than std.)
>
> Its using an FMF pipe/Turbine Core II sa/silencer, No-Toil filter oil, and
> Boyesen power reeds, with Yamalube-2R at 36:1, Chevron 91 gas. Pretty
> similar to yours.
>
> I took it up to Foresthill, CA a couple weeks ago during a hot spell.
> Elev. about 4500 feet, maybe less, temp around 85. Ran richer than
> Saddam's closet. I'm a little surprised that it is still too rich, and
> it's caused me to wonder whether I've got a transmission seal leak. I
> built a crankcase pressure test system last week, and the crankcase never
> leaked  even .1 psi during 2 tests, but now I've got to rule out a vacuum
> leak. Other than that, I can only keep going leaner with jetting.

Vacuum test ruled out a seal leak. I'm gonna keep going leaner.

--
Charles
'99 YZF600R
'99 YZ250

Thanks for your input, I appreciate it.  I'll give it a shot and see
how it goes.

I think I can afford to go leaner anyway, plus I will be putting on a
spark arrestor as soon as it arrives in the mail.  From what I've
read, an arrestor will make it run a LOT richer.

That's cool about the home made leak-down tester...  Was it hard to
make?


BadCRC




On Sat, 05 Jul 2003 17:01:08 -0800, chNOstem@mindSPAMspring.com
(Charles Stembridge) wrote:

>In article <chNOstem-0207032121360001@user-38ldukf.dialup.mindspring.com>,
>chNOstem@mindSPAMspring.com (Charles Stembridge) wrote:
>>
>> Just to compare, my '99 YZ250 is currently running:
>> 45 pilot (std. is 50)
>> 170 main (std. is 172)
>> N4DF jet needle @ 1st clip (this needle is one step leaner than std.)
>>
>> Its using an FMF pipe/Turbine Core II sa/silencer, No-Toil filter oil, and
>> Boyesen power reeds, with Yamalube-2R at 36:1, Chevron 91 gas. Pretty
>> similar to yours.
>>
>> I took it up to Foresthill, CA a couple weeks ago during a hot spell.
>> Elev. about 4500 feet, maybe less, temp around 85. Ran richer than
>> Saddam's closet. I'm a little surprised that it is still too rich, and
>> it's caused me to wonder whether I've got a transmission seal leak. I
>> built a crankcase pressure test system last week, and the crankcase never
>> leaked  even .1 psi during 2 tests, but now I've got to rule out a vacuum
>> leak. Other than that, I can only keep going leaner with jetting.
>
>Vacuum test ruled out a seal leak. I'm gonna keep going leaner.

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Thanks for your input, I appreciate it.  I'll give it a shot and see
how it goes.

I think I can afford to go leaner anyway, plus I will be putting on a
spark arrestor as soon as it arrives in the mail.  From what I've
read, an arrestor will make it run a LOT richer.

That's cool about the home made leak-down tester...  Was it hard to
make?


BadCRC



On Sat, 05 Jul 2003 17:01:08 -0800, chNOstem@mindSPAMspring.com
(Charles Stembridge) wrote:

>In article <chNOstem-0207032121360001@user-38ldukf.dialup.mindspring.com>,
>chNOstem@mindSPAMspring.com (Charles Stembridge) wrote:
>>
>> Just to compare, my '99 YZ250 is currently running:
>> 45 pilot (std. is 50)
>> 170 main (std. is 172)
>> N4DF jet needle @ 1st clip (this needle is one step leaner than std.)
>>
>> Its using an FMF pipe/Turbine Core II sa/silencer, No-Toil filter oil, and
>> Boyesen power reeds, with Yamalube-2R at 36:1, Chevron 91 gas. Pretty
>> similar to yours.
>>
>> I took it up to Foresthill, CA a couple weeks ago during a hot spell.
>> Elev. about 4500 feet, maybe less, temp around 85. Ran richer than
>> Saddam's closet. I'm a little surprised that it is still too rich, and
>> it's caused me to wonder whether I've got a transmission seal leak. I
>> built a crankcase pressure test system last week, and the crankcase never
>> leaked  even .1 psi during 2 tests, but now I've got to rule out a vacuum
>> leak. Other than that, I can only keep going leaner with jetting.
>
>Vacuum test ruled out a seal leak. I'm gonna keep going leaner.

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In article <59mjgv08g94r550qh8c4aj1c9a6dms4fmm@4ax.com>, BadCRC
<BadCRC@bbBBrrRRrrRRaaAAAPPPPPP.com> wrote:

>
> Thanks for your input, I appreciate it.  I'll give it a shot and see
> how it goes.
>
> I think I can afford to go leaner anyway, plus I will be putting on a
> spark arrestor as soon as it arrives in the mail.  From what I've
> read, an arrestor will make it run a LOT richer.
>
> That's cool about the home made leak-down tester...  Was it hard to
> make?

Nope, pretty easy, hardest part was driving to the plumbing supply and
auto parts stores. I posted my how-to-do-it here on rmd a week or so ago.

--
Charles
'99 YZF600R
'99 YZ250