Planet Minis

Wraith · 10-09-2008, 03:16 PM

i just put that FMF 4.1 pipe on my bike and i need to jet it. the bottom end is super rich. the bottom of the plug is black too. i pulled the main and pilot jet (mikuni 24mm) and the main is a 95 and the pilot is a 15. so what should i do???? also, were do i get these type of main and pilot jets?? the local motorsports shop doesnt carry them. let me know everyone. thanks

yellowrider · 10-09-2008, 04:37 PM

pilot = Idle/low speed
Main = high speed

By putting on a aftermarket pipe it would generally lean things out, not rich. If your bottom end is rich then try to make the adjustments from your air/fuel mixture screw, or may possibly have to go down on the pilot. Maybe include few details on your motor.

Wraith · 10-09-2008, 04:53 PM

well i could be wrong about the richness. i will tell you that the bike idles great, but when i start to rev just a little, it hasatates really bad. where can i get some jets???

MXkid714 · 10-09-2008, 05:23 PM

If it seems the bog/hesitate, its probably lean. Does it pop on decel? hard to start? those are all signs of a lean condition

bat999 · 10-09-2008, 06:00 PM

I think his bog is coming from richness.......like if you're at idle and go WOT it kills the bike by flooding it..... try a 90 and a 12 with needle clip in the middle.......you're plug should be tan or close to white...both in the threads and on the tip.....

APtech77 · 10-09-2008, 07:40 PM

Bog=rich
Whine=lean
You most likely will have to jet up with a new pipe install.
pilot jet= low end
Main= 1/2 to 3/4 throttle
Need= WOT

You want your plug tan to brown. Better a little rich than lean. Lean= hot hot hot, not good for air cooled engines.

MXkid714 · 10-10-2008, 10:50 AM

What exactly do you mean by whine?

I know before i rejetted my crf150, it was lean and if I quickly wacked the throttle it would bog

Modded · 10-11-2008, 02:51 AM

Quote:

Originally Posted by APtech77

Main= 1/2 to 3/4 throttle
Need= WOT

Needle Jet= 1/4-3/4
Main Jet= 3/4-WOT

Try adjusting your fuel screw, if it's more than 2 or 2 1/2 turns out then you need a richer pilot, if it is less than 1 turn out then you need a leaner pilot. you want to be between 1 and 2-2 1/2 turns out.

APtech77 · 10-11-2008, 12:18 PM

Sorry, I had that flipped. Thanks for the fix.

TheCRKid · 10-11-2008, 01:03 PM

dude i told u i have jets sitting here

my gut says since you put on a better pipe your flow is increased ,so try lowering the needle clip to raise the needle first if you cant get
try go up one on the main

there quite a few different motorcycling sites that explain the whole jetting process

Wraith · 10-11-2008, 11:13 PM

i finally came across some main and pilot jets. i started with a 15 pilot jet and went to a 20 and adjusted the air screw. this thing runs like a champ NOw. thanks everyone! now i can try to install the IRK. itried before but it didint work. ill try one last time before sending it back

10-09-2008, 03:16 PM	#1 (permalink)
Wraith 1st Gear Member Join Date: Aug 2008 Location: rio rancho , NM Posts: 130	the main jets or the pilot jets, that is the question i just put that FMF 4.1 pipe on my bike and i need to jet it. the bottom end is super rich. the bottom of the plug is black too. i pulled the main and pilot jet (mikuni 24mm) and the main is a 95 and the pilot is a 15. so what should i do???? also, were do i get these type of main and pilot jets?? the local motorsports shop doesnt carry them. let me know everyone. thanks

10-09-2008, 04:37 PM	#2 (permalink)
yellowrider 1st Gear Member Join Date: Apr 2007 Location: Frozen in Time MN Posts: 235	Re: the main jets or the pilot jets, that is the question pilot = Idle/low speed Main = high speed By putting on a aftermarket pipe it would generally lean things out, not rich. If your bottom end is rich then try to make the adjustments from your air/fuel mixture screw, or may possibly have to go down on the pilot. Maybe include few details on your motor.

10-09-2008, 04:53 PM	#3 (permalink)
Wraith 1st Gear Member Join Date: Aug 2008 Location: rio rancho , NM Posts: 130	Re: the main jets or the pilot jets, that is the question well i could be wrong about the richness. i will tell you that the bike idles great, but when i start to rev just a little, it hasatates really bad. where can i get some jets??? Last edited by Wraith; 10-09-2008 at 05:13 PM.

10-09-2008, 05:23 PM	#4 (permalink)
MXkid714 PM Newbie Join Date: Oct 2008 Location: New York Posts: 40	Re: the main jets or the pilot jets, that is the question If it seems the bog/hesitate, its probably lean. Does it pop on decel? hard to start? those are all signs of a lean condition

10-09-2008, 06:00 PM	#5 (permalink)
bat999 2nd Gear Member Join Date: Dec 2006 Location: Greensboro, NC Posts: 372	Re: the main jets or the pilot jets, that is the question I think his bog is coming from richness.......like if you're at idle and go WOT it kills the bike by flooding it..... try a 90 and a 12 with needle clip in the middle.......you're plug should be tan or close to white...both in the threads and on the tip.....

10-09-2008, 07:40 PM	#6 (permalink)
APtech77 PM Newbie Join Date: Sep 2008 Posts: 53	Re: the main jets or the pilot jets, that is the question Bog=rich Whine=lean You most likely will have to jet up with a new pipe install. pilot jet= low end Main= 1/2 to 3/4 throttle Need= WOT You want your plug tan to brown. Better a little rich than lean. Lean= hot hot hot, not good for air cooled engines.

10-10-2008, 10:50 AM	#7 (permalink)
MXkid714 PM Newbie Join Date: Oct 2008 Location: New York Posts: 40	Re: the main jets or the pilot jets, that is the question What exactly do you mean by whine? I know before i rejetted my crf150, it was lean and if I quickly wacked the throttle it would bog

10-11-2008, 12:18 PM	#9 (permalink)
APtech77 PM Newbie Join Date: Sep 2008 Posts: 53	Re: the main jets or the pilot jets, that is the question Sorry, I had that flipped. Thanks for the fix.

10-11-2008, 01:03 PM	#10 (permalink)
TheCRKid Advertiser Join Date: Jan 2005 Posts: 3,770	Re: the main jets or the pilot jets, that is the question dude i told u i have jets sitting here my gut says since you put on a better pipe your flow is increased ,so try lowering the needle clip to raise the needle first if you cant get try go up one on the main there quite a few different motorcycling sites that explain the whole jetting process __________________ T Bolt USA ALL top Pitbikes ,Engines and Parts for Pitbikes & Minis Website Contact THECRKID@TBOLTUSA.COM or Call 215-630-3554

10-11-2008, 11:13 PM	#11 (permalink)
Wraith 1st Gear Member Join Date: Aug 2008 Location: rio rancho , NM Posts: 130	Re: the main jets or the pilot jets, that is the question i finally came across some main and pilot jets. i started with a 15 pilot jet and went to a 20 and adjusted the air screw. this thing runs like a champ NOw. thanks everyone! now i can try to install the IRK. itried before but it didint work. ill try one last time before sending it back

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