Hi all!

One of the many benefits of living in Newfoundland where I do is a totally limitless supply of performance parts .. NOT!!

I've been calling all the dealers in my area to try and get some larger jets for my Warrior and of course the first thing any of the non-yamaha dealers say is "you'll have to call Yamaha for that" they all seem to think that Yamaha makes the carbs [img]i/expressions/face-icon-small-confused.gif[/img] and that nobody else carries parts for them ..

Anyway, one dealer of 2nd hand atv's asked if I had considered boring the main Jet? Has anyone else done this? Also, what size denominations do the jets come in? The stock is 145, is there a 146? I know someone mentioned 148 to me before. I'm under 1000' elevation .. what size (approximately) would I need with my uni-filter and an airbox mod?? I know dyno jet recommends a 155 main jet for what they call the "Stage 2" modification (pipe, filter, airbox mod). Is that the size I should be looking for?

Sorry for the profusion of questions, but my local dealers are as useless as t!t's on a bull!!!

 

for the sake of $3 - $4 find a dealer that will ship it over. Check the net if you know the make and type of carb you should have no problem at all finding a replacement.

 

i agree you should be able to find a dealer on the net that can ship it to you for a nominal fee. While you are at it get a few since you are paying the shipping anyway. You will prob need the 155 but be safe and for 2-3 bucks each get a couple sizes around it. I don't know about DJ but Mikuni comes in 2.5 increments ie. 155 then 157.5 150 etc. for your elevation I would recommend 152.5, 155, and 157.5 if DJ makes them in the same intervals, just to be safe and to only pay shipping once instead of getting one finding out it's wrong then paying shipping again for the right one. I would advise against trying to bore it yourself. Have you seen how small that hole is? Most likely you would end up ruining your stock jet anyway and end up worse off than you are now. besides evenif you find the exact drill bit size it would probably be more expensive than just buying the right jet off the internet. Good luck.

 

Take a look at this DYNO JET. They will UPS right to your house and yes they will sell direct to you. good luck. Jim

 

Well, as an update, I've found a local supplier who actually knows what a carb jet is and that Yamaha and Honda don't make carbs for their quads [img]i/expressions/face-icon-small-confused.gif[/img]

Right now I have a 150 installed with the air/fuel screw turned out 3.5, not sure of the needle position, if it didn't move when I took the carb apart then it's still in the stock position, whatever that is.

I'm presuming right now that the more turns out on the mixing screw the more fuel you get. I've posted a couple of times the condition I have right now, but here it is again since nobody responded to my other posts ...

idling is fine, when I punch the throttle fast off idle, it dies

if I ramp up slowly it's fine

if I'm cruzing in 3rd and punch the throttle the machine responds quickly and hard!! Love it!

if I hold the throttle wide open the machine sputters, like it's missing or something

I've also got on order a 152.5 and a 155, perhaps I should call them back and order the 157.5 too ... something to think on anyway

I haven't check my plug properly yet, but could someone also answer me this .. is there more than just the pilot and main jet in the Warrior carb? Where does each one kick in and out. As far as I understand the pilot operates from idle to 1/8 or 1/4 and the main takes over from there ... is that correct?

Over this weekend I hope to check those things out .. and can you tell me one more thing .. is this method correct ...

To check pilot operation and sizing/adjustment ...

1. warm the bike up on the old plug, change out for a new one, start the bike and start running right away without letting the bike idle. Don't go over the operation change point (1/8 or 1/4 what ever it is)
2. go for a short ride in 2nd or 3rd and then haul in the clutch and kill the bike while holding the throttle in the same position.
3. Check the plug color (ash lean, tan good, black rich) adjust accordingly and retest till it's right ...

To check main jet operation and sizing/adjustment
1. have bike warmed on the old plug, change out for a new one. Start the bike, don't let it idle and go wot into 3rd and travel at speed for a bit at wide open ..
2. haul in the clutch and kill the engine with the throttle held open
3. check plug color as above and adjust/retest until it's running good.

Is that correct? Is there any merit in performing a check at 1/2 throttle as well? If there's only the pilot and main, then the main is running at WOT, and if it's good there (tan) then it should be fine at 1/2 as well right?

Thanks for your replies guys .. Oh .. and I'm not using dyno jets, I'm using mikuni's ...

Thanks again

Trev

 

that sounds like a reasonable method for checking your plug...but it doesent have to be that exacting. as long as you dont let the quad sit there and idle before you check the plug, youll get an accurate reading. as for the condition you describe, it sounds like it running lean.....pull the plug and check it. a 155 main might cure your problem, but if it doesent, go up another size....us lowlanders often have to use pretty rich jets due to our thicker air down here (im at about 800-900ft). its really not a good idea to bore a jet, because the difference between a 155 and like a 180 is probly less than a mm. its just not possible to be exact enough by hand......not that someone hasnt gotten lucky before and hit the right size.......good luck....

 

Yeah, I agree it seems to be running lean. The funny thing is, with the 145 stock main jet I didn't have the sputtering problem. But after changing the jet I do have the trouble. At the very least I think I need to give the carb a really good cleaning.

The recommendation for under 3000 feet with an open airbox is 155, so I figured I would be save with the 150 since my airbox is closed. Does 3.5 turns out sound like too much on the air/fuel mix screw? She seems to run fine like that in regards of idling.

I've checked the plug after holding wide open and it's dry as a bone, but the color on it is good, mainly I guess from my previous setup. I need to get a set of clean plugs and do this properly. My bigger jets won't be in until next week [img]i/expressions/face-icon-small-sad.gif[/img] So hopefully I can get a happy medium this weekend with the 150, and when the 155 comes in then I'll install it and look at opening my air box a bit .. remove the snorkel or something like that ..

Thanks for all your help guys.

 

NLWarrior01, your on the right track with the jetting, keep working with it, you will get it the way you want with time. Good luck...Jim

 

Well I finally got to test my jetting ..

Setup is currently: stock pilot, 150 main, mix screw 2.5 out, airbox stock

From idle to 1/4 the setup is lean .. I've been advised against going more than 2.5 turns out as the mix screw can come loose and fall out .. that would $uck .. so I guess I'm going up to the next larger pilot

Wide Open ... way lean ... the plug is ashy grey white, so hopefully my 155 jet is in today. I'm also hoping that the parts dealer has a couple sizes larger. That uni filter certainly flows some big air!!! I don't know what the flow difference is going from a 150 to a 155, but I'm hopeing it's enough to be able to remove the snorkel at least .. I'm thinking right now that it won't be though . [img]i/expressions/face-icon-small-sad.gif[/img] We shall see. I'll keep you guys posted on my findings ..

Thanks again for all of your help!!

 

Are you running race gas or pump gas?