two main jets in grizzly carb????? - Grizzly Riders - Yamaha Grizzly ATV Forum

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post #1 of 22 (permalink) Old 10-18-2010, 06:17 PM Thread Starter
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two main jets in grizzly carb?????

Hello all,

New member here. glad i found you guys. anyway i was cleaning the carb on my 06 grizzly 660 and it looked like there were three jets in the carb. is that so? mine are 40 50 160. dyno jet kit installed in it too.
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post #2 of 22 (permalink) Old 10-18-2010, 06:44 PM
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The evel one

What's up down there in SC Brother....Gonna be in Myrtle Beach Friday Night at the House of Blues....Welcome to the forum....

The three jets are: pilot{idle},,mid-range{that big needle rests in it} and the main{High Speed}........

"07 SIXX SIXXXTY, FULL HMF UTILITY, DYNO-JET KIT, UNI A/F, EHS AIRBOX MOD, DYNATEK IGNITION, BLACK ITP SS 108 WHEELS, 28 ZILLAS, GRUNT CLUTCH KIT W/2MM SHIM, LEED ENGINEERING HITCH
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post #3 of 22 (permalink) Old 10-18-2010, 09:14 PM Thread Starter
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so which one do i need to change with my dj kit? it's been snorkeled and every since then it has been popping and spitting back through the carb right off of idle and seems to rev up slowly. i also have a lrd slip-on.
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post #4 of 22 (permalink) Old 10-18-2010, 09:21 PM
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I will take a stab at this and say you need to change all 3. Pilot probrably is why you are getting the spitting through the carb due to all the extra air from the snorks. The DJ kit doesn't come with a pilot jet so your best bet is to order a few and step up the size. Test until you get the right one and return the others if possible. Do plug chops (low, mid and high) to get the needle and the main right. Pilot- low range, needle- mid range, main- top end. If I am wrong El Dee or someone else will jump all over me for it and give you the right info....lol



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post #5 of 22 (permalink) Old 10-18-2010, 09:50 PM Thread Starter
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where would be a good start? 160 dj main? is that the one the needle goes through? 45 pilot at 2.5 turns out? what is the other jet mine is a 50 i believe.
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post #6 of 22 (permalink) Old 10-18-2010, 10:00 PM
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Okay now you got me confused. ElDee has a 660 so he would be the person to ask which size to start with. My 450 uses smaller jets. The main jet will be the one with the high #. The pilot would be the low # and the needle has the different notches where you place the clip. When you say 2.5 turns that actually is the fuel mix screw and not a jet. Are the jets in there now all stock?



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post #7 of 22 (permalink) Old 10-18-2010, 10:11 PM Thread Starter
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unfortunately no. someone has been monkeying with it. i just went out and looked at it and i have a 40 pilot which seems to be stock. then there appears to be a dyno jet 160 where the needle goes through. then the other jet says 55 and i have no idea what this one is or what it's for.
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post #8 of 22 (permalink) Old 10-18-2010, 10:25 PM
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The evel one

Well if it's popping right off idle start with a 45 pilot and the idle mix screw at 3 turns out. That should get the idle circuit in the ballpark..You can go to 3.5 out on the screw...Needle on mid-range should be on 4th clip with the DJ jet installed...Get it to top speed and let dead off..If it pops any hit it with a 165DJ..As Butcher said a 45 ain't in the kit...neither is a 165...both are available through EHS Racing...The Dealer is gonna give you a dumb look if you ask for a 45...more than happy to sell a pipe though...My mods are listed below...my location is dead center in NC...not sure about elevation...carb specs are 45/DJ mid jet, needle on 4th clip and a DJ 165..As Butch stated plug chops/checks at the three bands are the only way to accurately dial it. Popping is a dead lean give away also and it will be close if it doesn't pop on accel/decelleration...

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post #9 of 22 (permalink) Old 10-18-2010, 10:44 PM Thread Starter
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for the help i'll give that a try tomorrow. i still dont know what the third jet is for though. mine is a 55. i was looking at the parts breakdown and it list the one the needle goes through as the main 153.8 and the other one as the main at 55?
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post #10 of 22 (permalink) Old 10-18-2010, 11:15 PM
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The #55 jet is the "power jet" and effects only the extreme upper end (7/8 throttle to full throttle). Generally, it is not necessary to change this jet unless you are making radical changes (like a big-bore). As El Dee has pointed out before (learned a lot from that guy), each range builds on the one(s) below it...the mid range feeds off the idle/pilot (#40 - 45 Mikuni) circuit and the main (153 - 158 mikuni or 160 - 165 DJ) circuit and the high end feeds of the idle/pilot, main, and power jet circuits. Because the main has such a large influence on the high end, there is rarely a need to change the power jet if your main is correct. Think of the power jet as kind of a "booster" for near WOT, it doesn't have to be spot on, just needs to be in the right area to give the very high end that extra bit of fuel.
The main jet (also known as the needle jet) is the one that mates up with the needle and is dynamic in that the needle moves in and out based on vacuum (RPM/load/throttle position) so that it modifies its effective size based on fuel needs.

EDIT: Hopefully, I was correct in all this If not, the the Carb Master (El Dee) will surely chime in and set me straight (at least, I hope he will).

~~~~~~~~~~~~
Mine: '02 660 now in custom Hammered Copper paint
Mods: Custom air box mod for big-o' clamp-on K&N, Dial-A-Jet, 26" BH 2.0's on ITP SS 106's, SuperTrapp IDSX exhaust, Maier fender flares, black Ricochet skids. Remote res. Works A-T Steelers shocks on all 4.
Hers: '04 660 LE (Ruby red)
Mods: same A/F mod, 1.5" billet spacers with BH 2.0's on stock wheels, Yami aluminum skids.
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