1985 250r carb issues

[Auto_Demon]

So just recently my 250r sounds like its not getting fuel, it was running perfect earlier today and now when u give it gas it bogs and dies, took the carb off and cleaned everything, cleaned the in tank filter, shortened the fuel line and put an inline fuel filter in and its still doing it, ive also noticed that there is an air bubble in the fuel line but its still getting fuel, what is going on? Can anyone help me?

[yaegerb]

Possible your jets are too big?

[Auto_Demon]

Nope cuz it was running fine the day before and i did nothing to the carb, it was running good, we switched out tires and rims and then it started doing this

[barnett468]

Hello Auto Demon

So just recently my 250r sounds like its not getting fuel, it was running perfect earlier today and now when u give it gas it bogs and dies,

When it “bogs” does it burble/stutter like it is rich or does it simply fail to build rpm like it is running out of gas?

Pull plug out when it dies and see if it is wet.

took the carb off and cleaned everything, cleaned the in tank filter, shortened the fuel line and put an inline fuel filter in and its still doing it

Pull hose off at carb and see if gas flows quickly or slowly. Try it on maain and reserve. Gas valve might be partially plugged. Fuel filters are occasionally restrictive but since you had this problem without the new filter it is likely ok.

ive also noticed that there is an air bubble in the fuel line

It’s strange but they always do, it is not a problem.




GAS LEVEL TEST – If your gas level is low in the float bowl then your carb will be lean and may run out while riding mainly if there is a restriction in the line from tank to the bowl or at needle and seat.

Install clear plastic tube on bowl drain, hold open end of tube level with top of carb and open bowl drain valve. The gas will flow into the tube. It should be from level to 3/16" below the bottom of the carb body where it meets the bowl. If it is incorrect then adjust float accordingly.

Now tape that hose to carb, leave drain screw open and test ride. As soon as it dies look at gas level in hose. If it is low or empty then find fuel restriction.

[Grahm]

What does your spark plug look like?That will tell you quite a bit.Post a picture of the plug.Could be running rich and just
finally fouled it.

Mine did the same thing.Ran perfectly then all the sudden had erratic idle,bogged down,sometimes would start sometimes
wouldn't.
Found my plug was fouled.Changed it and have been fine since.

Heres a chart to help-

http://kereta.info/wp-content/upload...lug-colour.jpg

[Auto_Demon]

Didnt think it was fouled but now looking at that chart it looks like the plug is carbon fouled, ill post a pic anyways a little later. So ill replace it and see

[Auto_Demon]

I believe its still running a bit rich but i dont know what else to lean it out with. The clip is on the highest notch on the needle, and i am running 32:1 ratio, and i have no aftermarket parts on it...yet, should i try removing the airbox lid?

[Grahm]

What plug you running? BR9 OR BR8 ?

[Auto_Demon]

Br9es plug

[barnett468]

Hello


If the plug is black and dry [powdery] it is rich, it it is black gooey and moist even the least bit it is burning oil and possibly rich.

Does it smoke?

Lots or a little?

What color ids it, llite blue/gray or dark/black?

Removing the air box will lean it out slightly on top end.

You need to replace your plug or scrub every bit of black off it or it can miss fire.

[Auto_Demon]

Forgot to take a picture of the plug before i cleaned it, doh. But the plug was black and dry, looked like it had carbon buildup on it

[82 250r]

The clip is on the highest notch on the needle

That's pretty lean unless your riding above 7000 ft.
Try the clip on the 2nd or 3rd from the top.

[Auto_Demon]

That's pretty lean unless your riding above 7000 ft.
Try the clip on the 2nd or 3rd from the top.

It was on the 3rd clip but it was too rich even at 32:1, i might have torun 50:1. I was running that on my 83 250r woth the clip on the highest notch and it ran perfect

[82 250r]

It was on the 3rd clip but it was too rich even at 32:1, i might have torun 50:1.

32:1 works well for these machines...stick with that. Don't jet your trike with fuel/oil ratio.
If it works well on the top clip, you are probably compensating for another problem imo.
Things to check before jetting are:

Compression
Air Filter
Reed condition
Condition of electrical components
Float height
Pipe and silencer clogged
Air leak

Any of these can have you chasing your tail with jetting.
I would start with the factory jetting after checking all of the above.

You may want to look on ebay for an 86 34mm pj flat slide carb...those 85 pe round slide carbs are known to have issues.

Hope this helps
Marc

[Jason Hall]

Does it have the original (carb Round slide)?? If it has a oval slide (idle adjustment on choke knob) from a 86-89 Atc/Trx then could you have the slide in the carb with the cut out facing forward. That will make it run rich as heck especially when idling, and up through half throttle.