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help with carb problem?
Posted: 02:28 pm Feb 28 2017
by nate9521
I have a quarter to half throttle bog. if I don't get off it will shut off. but half to full throttle is strong. At first I had a 48 pilot jet and the bog was bad. Went up to 52 and the only difference I could tell was when the air screw was an 8th out. but it still bogged. but not quite as bad. I am right in saying that it still needs to be richer? should I try a 60 pilot?
Also someone mentioned something about the stator timing. If the timing was too advanced or retarded would it have this problem of quarter to half throttle?
Re: help with carb problem?
Posted: 04:17 pm Feb 28 2017
by bufftester
Re: help with carb problem?
Posted: 04:51 pm Feb 28 2017
by nate9521
Well it seems obvious that I need a new pilot. But what size? It's confusing because I read most guys use 42-48 and I'm still too lean at 52. Should I do 60?
Re: help with carb problem?
Posted: 06:03 pm Feb 28 2017
by KDXGarage
Which EXACT KDX is this????
Re: help with carb problem?
Posted: 06:05 pm Feb 28 2017
by nate9521
Jason wrote:Which EXACT KDX is this????
1993 kdx 200
Re: help with carb problem?
Posted: 06:32 pm Feb 28 2017
by KDXGarage
Elevation?
Humidity?
Temperature?
Any bikes mods?
Are you running oxygenated racing fuel or something standard?
If the bike is mechanically sound, then it should be somewhere around 45 or 48, unless you have some super oddball setup or conditions.
Re: help with carb problem?
Posted: 06:55 pm Feb 28 2017
by bufftester
Jason wrote:...If the bike is mechanically sound, then it should be somewhere around 45 or 48, unless you have some super oddball setup or conditions.
Thats the kicker. First thing is to make sure everything else is good, any air leaks, etc and you'll never get it jetted correctly. regardless of what is happening at quarter or half or full throttle it doesn't matter. Your pilot is determined by your airscrew setting. The key to jetting is to follow the process without skipping around or trying a bunch of things at once. One change at a time, following the process. I have literally seen hundreds of "need help jetting" threads over the years that end with "I finally followed the process and everything works now" type comments. Yes it takes time and patience, but it does work.
Re: help with carb problem?
Posted: 07:09 pm Feb 28 2017
by nate9521
Jason wrote:Elevation?
Humidity?
Temperature?
Any bikes mods?
Are you running oxygenated racing fuel or something standard?
If the bike is mechanically sound, then it should be somewhere around 45 or 48, unless you have some super oddball setup or conditions.
Sea level, normal humidity and temp. No mods. I just thought of something though. It smokes white really bad. I think somehow I'm getting gearbox oil in the combustion chamber and it's leaning the mixture. Maybe cranks ealing. My sprocket seal leaks bad but it wouldn't get in the cylinder. It just drains out
Re: help with carb problem?
Posted: 07:24 pm Feb 28 2017
by bufftester
bufftester wrote:Jason wrote:...If the bike is mechanically sound...
...Thats the kicker. First thing is to make sure everything else is good...
Re: help with carb problem?
Posted: 07:56 pm Feb 28 2017
by nate9521
Well I don't have time to split the case now so ima just put a 60 in it and keep polluting. As keep oil in it
Re: help with carb problem?
Posted: 09:46 pm Feb 28 2017
by KDXGarage
Normal temp for Antarctica?
Where are you??
Jerry Maguire, help me help you.
If it was leaking transmission oil into the combustion area, it would be black. White equals coolant. Check your coolant level. Many threads on here about E series coolant pump seals.
Pilot should be around 45 for most locations and around 70 degrees
Re: help with carb problem?
Posted: 08:43 am Mar 01 2017
by nate9521
Jason wrote:Normal temp for Antarctica?
Where are you??
Jerry Maguire, help me help you.
If it was leaking transmission oil into the combustion area, it would be black. White equals coolant. Check your coolant level. Many threads on here about E series coolant pump seals.
Pilot should be around 45 for most locations and around 70 degrees
Coolant hasn't been dropping. My dad put regular Trans oil in it and not 10w30 like the manual says. Would it smoke white? Ima put 10w30 in it and see if the smoke changes color
Re: help with carb problem?
Posted: 08:44 am Mar 01 2017
by nate9521
nate9521 wrote:Jason wrote:Normal temp for Antarctica?
Where are you??
Jerry Maguire, help me help you.
If it was leaking transmission oil into the combustion area, it would be black. White equals coolant. Check your coolant level. Many threads on here about E series coolant pump seals.
Pilot should be around 45 for most locations and around 70 degrees
Coolant hasn't been dropping. My dad put regular Trans oil in it and not 10w30 like the manual says. Would it smoke white? Ima put 10w30 in it and see if the smoke changes color
And since 10w30 is Thicker than the Trans oil in it right now would that make it leak slower?
Re: help with carb problem?
Posted: 03:17 pm Mar 01 2017
by KDXGarage
Is the transmission oil level going down?
Re: help with carb problem?
Posted: 05:28 pm Mar 01 2017
by bufftester
nate9521 wrote:Well I don't have time to split the case now so ima just put a 60 in it and keep polluting. As keep oil in it
What in "Follow the jetting guide" leads you to think you need to split the cases? You're just randomly trying things with no luck while folks with LOTS of years and experience on these bikes are telling you what you need to do, but you refuse to listen. Good luck with it....