Getting ready to drop kick the KDX. I'm wearing out the carb I've had it off and on so many times. Can't get rid of the bog when I snap the throttle on in 3rd or 4th. 3rd gear roll on is OK, good power, pulls hard. I had a bog before the carb work but I'm focusing on it now. I've had the bike for a year. Was "supposed" to have low hours on a complete rebuild when I bought it. That's all I know about it's history.
Specs: (now) 152/42, CEK-5, 40:1 mix, float level -1mm from mating carb point
I installed Boyeson reeds
RB carb mod w/ long mixture screw about 2 5/16 out.
Stock gearing 13/47. Maybe I should go to 13/49?
I've checked compression. It's consistently 145lbs.
I'm not using any tranny oil, so it doesn't seem like crank seals are bad.
Bought the float tool so I could set float precisely. I have read confusing remarks on float height. I haven't changed this since I set it.
Carb boots are tight.
I'm in the NW, temps are low 40's to low 50's.
Tried every combo of jets from 40/150 to 45/155 and CEK,DEK -3,4,5.
Leaner jets and needle settings made the bog worse.
I've adjusted the mixture screw till I'm blue in the face. Spent hours riding on dirt roads fine tuning it by 1/16 increments +- from 2 1/2 turns out to try to get rid of the bog. Seems the best performance I can get is: the bike will just rip thru the gears, front tire coming up, with me holding on tight, very good lugging too, just walking up hills and then it will accelerate. Sounds great right?
In normal woods riding this would get me by in very good fashion. The only time the bogging shows up is on road riding. I have been trying to dial in the SSS and that's how I noticed the bog. I seem to be in the SSS judging by the roll on and low end performance, but on the road when I stab it in 3rd going up a slight hill it bogs. Someone else said "not like a small engine bog but a BoooWAH bog" if that makes sense. It bogs and eventually when it hits the Kips it takes off.
I appreciate your well thought out responses. This is dead serious to me and the fate of the KDX rests on it. She's shaking in her boots after that comment, :yikes: but seriously this is getting ridiculous. I've never had this much trouble jetting a bike. I'm desperate or I wouldn't be writing this! Maybe this is the best she can be, or there is something mechanically wrong, but judging by what I've read there's room for improvement. Most of you say you have NO hesitation/bogging. This could be due to more mods or not. There are so many posts that are not finished or the info is confused but I thought I would give this a try. I'm sure there's something I haven't tried or left out.
Thanks guys,
Doug
Specs: (now) 152/42, CEK-5, 40:1 mix, float level -1mm from mating carb point
I installed Boyeson reeds
RB carb mod w/ long mixture screw about 2 5/16 out.
Stock gearing 13/47. Maybe I should go to 13/49?
I've checked compression. It's consistently 145lbs.
I'm not using any tranny oil, so it doesn't seem like crank seals are bad.
Bought the float tool so I could set float precisely. I have read confusing remarks on float height. I haven't changed this since I set it.
Carb boots are tight.
I'm in the NW, temps are low 40's to low 50's.
Tried every combo of jets from 40/150 to 45/155 and CEK,DEK -3,4,5.
Leaner jets and needle settings made the bog worse.
I've adjusted the mixture screw till I'm blue in the face. Spent hours riding on dirt roads fine tuning it by 1/16 increments +- from 2 1/2 turns out to try to get rid of the bog. Seems the best performance I can get is: the bike will just rip thru the gears, front tire coming up, with me holding on tight, very good lugging too, just walking up hills and then it will accelerate. Sounds great right?
In normal woods riding this would get me by in very good fashion. The only time the bogging shows up is on road riding. I have been trying to dial in the SSS and that's how I noticed the bog. I seem to be in the SSS judging by the roll on and low end performance, but on the road when I stab it in 3rd going up a slight hill it bogs. Someone else said "not like a small engine bog but a BoooWAH bog" if that makes sense. It bogs and eventually when it hits the Kips it takes off.
I appreciate your well thought out responses. This is dead serious to me and the fate of the KDX rests on it. She's shaking in her boots after that comment, :yikes: but seriously this is getting ridiculous. I've never had this much trouble jetting a bike. I'm desperate or I wouldn't be writing this! Maybe this is the best she can be, or there is something mechanically wrong, but judging by what I've read there's room for improvement. Most of you say you have NO hesitation/bogging. This could be due to more mods or not. There are so many posts that are not finished or the info is confused but I thought I would give this a try. I'm sure there's something I haven't tried or left out.
Thanks guys,
Doug