After drilling eight 1/2" holes in the exhaust, rejetting to 132/136 mains with the DG snorkle and TwinAir filter the 650 ran like a champ. Went for a ride on Saturday and after riding through some water and then stopping, she began to idle poorly and stalled twice (this happened until the steam that was coming off the headpipe stopped). Also, since riding on Saturday the 650 has a very slight hesitation at initial stab of the throttle again (it happened last fall and I took the mains out and cleaned/blew them out with compressed air and it was all good afterwards). I haven't touched the idle mixture screws since I originally installed the 128/132 mains after installing the DG snorkle/TwinAir filter last year but before the exhaust mod. I also still have the needle on the 4th notch (I can't remember if it was 4th or 5th but am sure it was one notch different than dynojet recommended, as Nyroc mentioned).

I remember reading on here about quads doing this if too lean or too rich or something...does this sound like the symptoms? Should I change the needle and/or the mixture screws?

...as always, the help is most appreciated.

 

You air screws are too rich. Also, the 5th notch may be slightly rich for you machine, and the 4th notch may be slightly lean.

You can do halfway in between by using the shims that dynojet gave you (or not using them).

My exhaust mod will also fix this, but you may have to richen the mains one size.

 

Nyroc, I did the exhaust mod and bumped the mains up to 132/136...think I need to go bigger?

Where do you think I should start, the air mixture screws or move the washer up on the needle (to the 5th notch)?

Since it's got the slight hesitation the first 0.5 sec after you stab the throttle, think it is the needle that needs adjusting?

It runs great (except for the hesitation) and only idles poorly after going through water. I remember someone posting on this before. Any info would be great.

 

Oops, my bad. You are rich enuff. I read that too fast.

Your needles sound a tad rich. I hate to tell you to go back, because you may start coughing. See if you can arrange the shims so you are only a little leaner.

 

Leaner...do you mean moving the shim to the 5th notch?

Will I accomplish anything (making it more lean) by adjusting the air mixture screws?

 

Leaning the air screws are only going to help prevent stalling out at idle.

If you bog at part throttle stabs, you need to adjust the needles so they protrude back into the bore more. You could move a clip to another notch position, or you could see if moving those shims that came with the kit in front of or behind the clip will get you halfway between clip positions.

 

Nyroc...I get what your saying somewhat, but you lost me on the last post. I think I'm going to move the washer to the 5th notch and see how it goes.

Anyone else ever have anything similar with their 650???

 

what nyroc is trying to say is that there were 4 tiny washers provided with the jet kit, along with the circlip and needle, the tiny washers are to fine tune the needle, if you are on the 4th notch and you feel that it is running a tiny bit lean but does not warrant moving the circlip to the 5th notch you can take the tiny washers and place them in front of the circlip on the needle, this would back the needle up out of the bore somewhat, but not as much as moving the circlip to the 5th notch, basically placing the tiny washers in front of or behind the circlip is enableing half sizes.

hope this helps, good luck

my settings are 132 136, 5th notch, one washer behind circlip, im under 1000 ft sea level

 

If I move the needle to the 5th notch from the 4th or use washers to go in between the 4th-5th, will it make it richer or leaner? From what I described, does it sound like I need to go a full notch up or half? The bike runs fine, just a slight hesitation. thanks...this is killing me.

 

Parker 650,

Believe me, I know what your going through, I have been into the carbs at least 10 times, and I think I will always look for something to be wrong, even if it isnt. Anyhow, moving the circlip forward towards the needle tip will richen your mixture because it is shortening the needle and moving it back out of the bore allowing more fuel in. Moving the circlip back away from the tip towards the base of the needle will lean the mixture because this lengthens the needle pushing the tip further into the bore.

My settings are 132 f 136 r, On the needle I am on the 5th Notch with one tiny washer behind the circlip towards the base of the needle, Even though the circlip is on the 5th notch placing the washer behind the circlip will lengthen the needle making the mixture a little leaner. The little washers are there to help fine tune and put your mixture right on. You have to experiment and see what your machine runs best at. If your a little rich I would suggest using the washers (shims) provided to fine tune, If your alot rich then moving the circlip would be what you could do. The 4th position on the needle is leaner than the 5th but you can use the shims to get in the middle by moving to the 5th notch and then placing the shims behind the circlip.

Good Luck, hope this helps