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jetting questions

bruteornothin2010-08-11 15:11:36 +0000 #1
Got a 2007 650 carburated brute with utility series exhaust dynatek cdi, different clutch springs, and so on! It runs great from 0-about 30 mph but from 30-50 it tends to bog down after running at a steady speed of like 35 for instance! If i run at a constant 35 mph and then hammer it, it bogs way down and i need to pump the throttle to keep er goin! It runs great from 50 mph and up! I need to check and see what jets are in it but is this what the problem is??? If that is the problem, are there any how to diagrams on jetting??
RDs Neighbor2010-08-11 15:25:53 +0000 #2
That sounds to be midrange throttle position. it will most probably be the needle.

2 questions:

1 is your bike snorkeled, and did you snorkel it at the same time you installed your HMF Utility?

2 have you installed a jet kit? I am not that familiar with the 650's, but, if they are like the 750 your needles will be non adjustable. You can richen the bike by shimming your needle, but you cannot lean it by lowering it(not that I know of).

Just so you know, that surge you are feeling can go either way. I would guess you are lean, if you just installed the HMF without snorkels and with the CDI. If that is the case, shim your needles with a #4 brass washer, that should get you close. Do you know how to read spark plugs? If not search it here. There is a pictorial somewhere

If not, you may need to purchase a jet kit.

Good Luck
bruteornothin2010-08-11 15:50:30 +0000 #3
yeah, i do have a dynajet kit. I had the dealer in town install the jetting that he felt was correct but that was when it was about 30 degrees cooler! It ran like a champ in the cooler weather but now being close to 80 and humid it has changed! I started out putting exhaust on right when i bought the machine and put bigger tires on, then came the CDI and then the different clutch springs! No snorkels on the machine as of right now and no i have not messed with jetting before!
RDs Neighbor2010-08-11 15:25:11 +0000 #4
Move the e clip down on space. (resulting in raising the needle or richening the machine). If it worsens lower the needle 2 grooves resluring in leaning the machine. Go with the position that works best.

It is difficult to determine exactly whether it is rich or lean without reading the plug.

You should download the dynojet jet kit instructions for a pictorial of the Carb if you are not familiar with it

Good Luck
bruteornothin2010-08-11 16:40:44 +0000 #5
So i checked out the diagram


Is the part number of the needle....16187?? and what is the number of the clip that you are refering to??? Sorry for being a pain, just want to make sure i know what i am going after before digging in!! Thanks for the help!
bruteornothin2010-08-11 15:39:30 +0000 #6
ok so i ripped it apart today to find that they had installed a 132 and 136 jet and had the e clip on the very first notch towards the center of the needle! So i moved the clip two notches out from that spot! Wasn't able to take it for a ride but did fire it up and it idled fine but when i held it at half throttle it ran rough! Do i need to go a step up on the jets??
GREEN_SUBMARINE2010-08-11 16:52:37 +0000 #7
sorry this is off subject i bought a hmf pipe an optimizer i look around on here but cant find a digram or instructions to wire the optimizer in on my 09 750 does n e one know where i could look?



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