After I did these mods,

Big gun full exhaust
dynojet kit
K&N filter

My raptor will stall when I have to stop quickly.

If I am running hard and then stomp the brakes for whatever reason, the bike will die, but if I keep the throttle on a little it is ok, I am thinking that maybe the fuel is sloshing in the bowl and starving the bike for a minute.

What do you think?

Any input is appreciated
Bat

 

check these three things,
1-Easiest is to make sure your idle screw is high enough, I read online somewhere that increasing your idle screw will prevent a backfire from the head into your carb, resulting in the cracking of the carb boot,
2-make sure your jets didn't fall out. my buddy has the same jet kit and the jets came loose twice.
3-check the carborator and boots to make sure the carbs aren't off set and the boots aren't broken. besides that, I would say you did all the proper mods, especially puttin the exhaust on with the jet kit, good luck.

 

you may be lean on the low end, check plug, I am running a 25 pilot at 7000' altitude and I notice a lot of folks go to a 27.5 with big gun/air filter combo at sea level

 

Mine does the same thing too since adding pipe, Dynojet and Pro-flow. I usually feather the throttle when slowing down abruptly. My idle is high enough and it still does it.

 

your low and midrange may be rich from the Dynojet (thinner needles and 3 turns out on the screws) and you flood when you stop abbruptly. maybe?

 

mine was stalling as well. my problem was my choke cable. i know your problem was when you stopped. mine was when i turned the handlebars while stopping or slowing. may not have anything to do with your problem but it may help someone. you should have a little play on the lever. turn the handlebars all the way in one direction or the other and then check it. but check both turns because mine was only tight when turned to the left.

 

Thanks for the replies, I will be checking it out on Thursday. You know tommorow is Halloween and got to go trick or treating with the son.

I am running a little on the rich side, I went with the dynojet 144/146 jets and am at 6000 ft altitude. I did this because I ride anywhere between 3500-7000 ft. It runs good and strong, but that stalling is bugging me.

I don't have too much trouble with it, I just feather the throttle when stopping, but my wife will just kill it everytime. I need to get her, her own bike.

Does any one know what the stock pilot is?

Thanks for your info
Bat

 

Oh, also, I pulled the plug the other day, this was after riding several different types of terrain and not a plug test. This plug was also in for probably like 6 hours of riding. I put it in after doing my mods.

The plug was white on one side, and the other side was dark brown to blackish. The side electrode was dark brown also.

If that gives anyone a clue let me know. I will do a plug test as soon as possible.

Bat

 

If it stalls it is usually due to being to rich, to lean generally causes the rpm's to hang a bit before finally dropping to an idle. I'd try to lean down the mixture screws 1/4 turn at a time...

JPBRaptor

 

<< if I am running hard and then stomp the brakes for whatever reason, the bike will die, but if I keep the throttle on a little it is ok, I am thinking that maybe the fuel is sloshing in the bowl and starving the bike for a minute >>



I assume you are not locking the rear brakes up when slowing down. If this is not happenning ANY OTHER TIME, it's clearly a idle circuit problem or a small vacuum leak somewhere that only pops up when intake velocities are low (did this just happen after installing the jet kit?). Check all intake boots for cracks and too make sure they are mounted correctly....especially check the 2 &quot;cylinder head side&quot; clamps to boot connections...you could have overtightened the clamps. If the vacuum problem is non-existant, then it's either too rich or too lean on the idle circuit. Probably too lean if you have never messed with adjusting the mixture screws. Stock pilots is 22.5 for both sides. Don't change them until you wind up having to back the mixture screws out more than 3.5-4 turns. Keep us posted.