Where are you at in Michigan?
We really need to take a few (maybe alot) steps back on this before you blow this quad up.
- What Model and Year Quad is this?
- Can you tell us what model carb is on it? Brand and any markings?
- What has been done to the this quad? Is it stock? Does it have a OEM airbox and filter? Can you post some pictures of this thing?
Nevermind - you said there is a filter right off the carb. Please confirm what carb and model is on this bike.
I'm in White Lake about 40 minutes north of Detroit.
It's a 1990 lt250r
Has a fmf pipe with a fmf turbine core silencer.
Only other mod is the k@n off the carb and no air box.
Engine is now .60 over and the head was milled down a bit to fix the scratches and stuff.
Compression was just over 130 when I tested it yesterday.
I will attach some pictures of the carb cause I have no clue where these markings are. Also I will attach pictures of a new plug and after winding the quad up and then killing it right away.
Appears to be a stock carb. Like the looks of that intake too,,,, If you can, take and cut the threads away from the spark plug so you can see down to the bottom of the insulator in the pics please good sir.
Can anyone chime in with the stock size pilot, needle setting, and main are for a 1990 LT250R?
I think the open clamp on filter will bump up the main jet pretty good.
37.5 pilot 240 main and needle in 3 rd clip. Stock. I ran on fmf boyesen rad kn filter head shaved 195 main 35 pilot needle 4th clip. 210 main 40 pilot needle 4 th clip in winter.
I made a mistake in an earlier post when I said that a 280 main jet is too lean. I thought that you had a LT 500.
I made a mistake in an earlier post when I said that a 280 main jet is too lean. I thought that you had a LT 500.
Hahaha, good cause I thought you were crazy when I read that!
37.5 pilot 240 main and needle in 3 rd clip. Stock. I ran on fmf boyesen rad kn filter head shaved 195 main 35 pilot needle 4th clip. 210 main 40 pilot needle 4 th clip in winter.
When you say 4th clip do you mean the 4th clip going down on the needle? I have mine in the middle right now so the 3rd.
Appears to be a stock carb. Like the looks of that intake too,,,, If you can, take and cut the threads away from the spark plug so you can see down to the bottom of the insulator in the pics please good sir.
I can try but I would have to use a hacksaw and i'm not sure how much of a pain this would be. Does it look a little on the lean side?
How does this quad run now with the 260 Main jet?
Does it idle and start ok?
How does it run when you are riding 1/4 to 1/2 throttle?
How does it run when you do wide open runs through the rpm range to the top end?
This is a plug chop with a barnd new plug after doing a wide open run. You have to cut "chop" the plug to read the band on the plug. You can see where one of these plugs is reading richer than the other one.
Note: Jetting is a practice of feeling how the bike runs and also some mechanical inspection. I would spend some time with googling "two stroke jetting" before going much further. There is a post on this site that was really well written too.
Are the plus fairly easy to hack up with out breaking the ceramic insulator?
Do they even make a pilot jet smaller then 30? Is this the reason I have to have my slide adjustment screw all the way in to idol? Everything I read says pilot jet 30-40 and nothing smaller.
They make down to 20 I know of.
Do they even make a pilot jet smaller then 30? Is this the reason I have to have my slide adjustment screw all the way in to idol? Everything I read says pilot jet 30-40 and nothing smaller.
If it appears to need a pilot jet smaller than # 30 there is probably something else wrong with the carb. Needle jets and needles get worn out and are frequently overlooked when trying to cure a rich condiiton at small throttle openings. Bad float valves and or the oring that goes around the outside of the float valve are also a common problem.