ported srx and jetting questions

YA*AM*A*HEAD

YA*AM*A*HEAD

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ok i have a 98 srx 700 ...i was told it was ported ...how do i tell what kind of porting has been done ?the reason i am asking is cause i opened the carbs and it has 150.0all the way across..47.5..all the way ...and two turns out on screws...and the clip position i dont know were or how to check them....it is a 700 ported? with maxx performance mega power head ...not sure what domes are in it or how to tell ....and i am gonna run aaen tripple pipes on it ...i plan on running a tempa flow or a vari flow ...i got both but dont know which is the better on to run ....also i have the 600 cdi and have been told it has more timming than 700 cdi ....just wondering if i should start with this jetting and put carbs on or if i should change it now before i but carbs on .....also i removed the oil tank when i put it back on i need to bleed it? open the brass screw on the hose that is bolted to the middle carb on the bottom left?? remove it and fill tank and wait for oil to come from hose ?? or do i got to turn the motor over til it come out ? thanks again guys
 
yeah, just open the bleeder screw thats by the middle cylinder rubber intake boot. keep it open till all the air bubbles in the line are gone. i wouldn't run the aaen pipes for the 700 srx. i was always told/heard that the stock yamaha pipes for the 700 srx were hard to beat. unsure of the cdi thing with timing. seems to be jetted quite fat on the bottom end and not so much on top.
 
I'll second staying with the stock pipes instead of running the aaens. My cousin put aaens on his 98, he feels like he actually lost a little bit of performance. There's certainly no "seat of the pants" noticeable improvement. Save your $$. Ofcourse, he gave away the stock pipes several years ago, and now wishes he could try them on it again.
 
the pipes are what is on it so that is what i have ....i was wondering how to tell if my jetting base line is too high for the motor i have .it was from a mountain srx from denver colorado so i was wondering if jetting was for the mountains or can i run with jets that are already in it ...and how to tell if it is ported ......
 
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that sounds close to what i have for jetting but mine is differnt in the differnt cylinders. i think i even have 47.5 piolets and up too 157.5 mains.
 
well i have looked in the tech pages and the stock jetting says 146.3 3-148.8.....and a 42.5 pilot......so i am jettet too rich for stock ......just wondering if with the trail porting ,maxx head and pipes ..how close to stock i need to be ? any one got any suggestions?
 
I can't tell you exactly what my cousin is running in his with aaen pipes and port and polish, but I think it's around stock in all three ranges. He is also running a cold air intake from the dash and foam seal around the air box, everything else on the motor is stock. We normally ride around 5000-6000 ft. elevation, but his dad's cabin is at about 4000-4500 so that's what we have both jetted for as we ride there a few times a year, temp is around 0 to 20 F. He gets away with close to stock jetting due to the higher altitude. He runs his leaner than I would care to have my sled, a long hill climb would make me really nervous. He is more of a drag racer-boondocker though, and doesn't make long climbs. I could find out what he's running if you want, but you guys have some different mods from each other. What elevation/temps do you normally ride? Do you know what elevation the previous owner rode, or were the mods not done to it when he had it? As far as checking your clip position on the needles, go down to the "tech FAQ" and look at the thread on "carb cleaning 101" by MrViper. You'll see how to access the needles.

If nothing else, this site is extremely slow right now but will increase dramatically this fall. You could hold off on the jetting until this fall, you will probably get tons of responses then. I wouldn't doubt that you could probably find a couple people running close to your exact set-up.
 
the motor had all the mods on it while the previous owner owned it ....it was from colorado ....and had a tempa flow on it ....i have a tempa flow and a vari flow....i can install ...i ride here in indiana in the fresh powder ....and usually a trip or 2 up to the irons mi area ..not sure of the elevation here or there.....i have the sled in parts and want to get it back together before it gets cold ,cause i have no heat in the garage lol....i am just wondering if i should run the 150`s or go a little smaller ,,,i just dont want to have to take the carbs off more than i need to
 
You're going to have to jet it in the conditions you ride it. Anything else is just a guess. Some guys are obviously better at guessing than others, but it's still your sled thus you have to be able to fine tune it unless you just want it to run ok. Depending on the porting and the pipes, it may or may not need more fuel in spots. If it were mine with the aftermarket pipes I would start out with about 155 mains, needles in the 4th with both washers over the clip. Pilots I'd leave whats in it and set the fuel screws at 1.75 turns. Then you need it to snow so you can run it and see what each carb circut tells you. You want to start out fat and lean it down to where you are comfortable with it. Once you've had the carbs out a few times there is nothing to it.
 
I agree with Ryan, I don't think there's any way that your not going to have to pull the carbs a few times to get it "perfect". Pulling the air box gives you quite a bit of room, and after having them off a couple of times you'll get pretty fast at it. I also was thinking that the mains are small if anything, especially if the previous owner was riding a very high elevation in Colorado and assuming that your riding at a fairly low elevation. Like I said, my cousin rides mainly between 4000-6000ft, huge difference from the lower elevations that most on here ride. For example, you'll see most on here running Vipers with pipes on them talk about having around 165 mains. I'm running the stock 156.3's in mine and am still a tad rich even with the Flo-rites in the dash. Definitely find out what elevation your going to be riding at, along with average temps (theres a big difference between 30 F and -20 F), that helps a lot in getting a starting point. Do several plug/piston wash checks on the bottom, mid, and top end. Plan your first couple of rides with the mind set of all your going to get to do is tune on the sled. Bring everything with you to be able to pull the carbs, change jetting, and re-test. You may also have to play with the fuel screws' setting if you have a lean bog when first hitting the throttle. If you get them up to 2-1/4 turns I would go up a size on the pilots and start at 1-3/4 again. On the needles, raising the needle/lowering the clip makes it richer, lowering the needle/raising the clip makes it leaner. I would make the first ride and see where the jetting is at and then go order some jets if need be. Order two or three sizes of mains going in whatever direction you need to go, throw the set in that's your best guess on being right, and then test and go from there. It's better to sacrifice a couple of the first rides doing this than to ride it blindly and end up burning it down (read about people doing that quite frequently). I actually enjoy tuning on the jetting and clutching, the first rides usually don't have good snow to really play on anyway, just enough to ride the trail. I used to not have a heated shop either (still don't, but my uncle does now) to work in, just get a small heater to warm your hands so you can feel them again, lol, a real PIA. Cold hands + gas = really cold hands! lol Ofcourse, be careful about putting gas soaked hands in front of a propane heater.
 
ya i opened the orgional carbs from the sled ...600 motor and it has 155 mains and 47.5 poilts in it so i figure ill throw them in ...but i cant find the section about adjusting the clip position ....anyone got a link ?
 
Aaens are 25 pounds weight savings over stock SRX 700 pipes though , i read you wont lose any power with them but stock SRX were good pipes for sure on the triples, mine came with Aaens never ran it with stock pipes.
 
yamahead,
if its any help to you my 00 srx 700, stock motor with cold air kit, run between 0-30f, around 2000ft, mains 152.5 pto, 150 mid and mag, needles #3 with both shims under, pilots 42.5 across the board, idle mixtures 2 out
 
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