85 250r too rich

[barnett468]

Well im going to have to now, i didnt change anything when i put the exhaust on and now its super rich

From post #4.

Simple, if you're sure it's rich get a smaller jet from the same vendor. some of the aftermarket jets are not equal in size to the oem ones.

[jb2wheels]

Something is wrong if an aftermarket exhaust richened the air/fuel mixture or the stock setup.

I've had four strokes need leaner jetting with a pipe. Essentially the pipe was efficient or tuned enough to create a a stronger "signal" at the carb. I imagine a 2 stroke could have the same problem?

A little off topic... I had it happen with a Bill's pipe on a 185s. I remember because I could not get it sorted and I was a know it all teenager at the time.

My dad, of course, told me it needed to go leaner. He had the same thing happen on an old Roundtop. I finally relented and did what he said and sure enough, he was right...

[Auto_Demon]

K so i put a 138 main jet in, holes drilled in airbox and running 50:1 and its STILL rich! What the hell is going on, i dropped a full 10 main jet, went from 148-138

[Slingblade]

Go back to 32:1, 40:1 at most. Never change your pre-mix ratio to tune your bike.

Was the exhaust new or used? Check your silencer packing.

Did you put in a new plug with the jet change? How exactly does it run?

[Auto_Demon]

brand new fmf exhaust, put in a new plug when i put the jet in, it runs fine until wot then it sputters, but it smokes alot

[Slingblade]

Did it help it going from 148 to 138, or run about the same?

It could be a crap shoot with that carb, I know nothing about them.

Just make sure to do a wot plug chop to be certain your not headed the wrong way.

Check the choke circuit in that carb, make sure it's closing off, that would do it.

[Auto_Demon]

it did help a little bit, it smokes less than it did before. i did a plug chop, just waiting for the bike to cool down so i can check it.

[Auto_Demon]

plug is slightly wet and black all the way down inside with a slight brown hue

[Auto_Demon]

Well it looks like im getting even smaller jets

[barnett468]

brand new fmf exhaust, put in a new plug when i put the jet in, it runs fine until wot then it sputters, but it smokes alot

plug is slightly wet and black all the way down inside with a slight brown hue

can you post a photo?

yes try around a 130 if 135 was the last.

what color is the smoke, lite gray or dark black?

does it linger or dissipate after a few seconds?

You plug should be bone dry when you remove it hot after 30 seconds because the heat will dry the gas up. if it is even barely moist 30 seconds after removal it is oil.

i suggest a leak down test. you might be sucking oil from the gear box due to a bad crank seal

[Auto_Demon]

Ill post a picture tomorrow. Smoke is light greyish blue, and it lingers for a long time. I checked the chaincase oil and its at a good level, rode it around for a good 5-10 minutes and checked it again and it was fine

[Auto_Demon]

I guess i should have mentioned this before but if you put your hand behind the silencer and rev it you will have oil on your hand and there is oil leaking from the pipe

[yamaha225dr]

I guess i should have mentioned this before but if you put your hand behind the silencer and rev it you will have oil on your hand and there is oil leaking from the pipe

Splooge is normal on an improperly jetted two stroke but if I were you I would ditch that carburetor and do a leak down test. Something is wrong with your machine and it sounds like you are gonna just chase your tail trying to get it resolved just throwing jets at the carburetor. There is no way going from a stock exhaust to an aftermarket one is gonna require you to lean out the air fuel mixture that much! Which brings up another point. Have you checked the packing in your silencer? Any dents on the expansion chamber or any chance something is inside the exhaust obstructing the exhaust flow?

[3wheelrider]

What carb do you have exactly.- something is wrong with that carb it seems.
The needle in the leanest setting? that alone isnt right. -Could it be a problem with the choke interfering with jetting?

[Mosh]

I have been watching you start thread after thread about running problems on this trike.
a few weeks ago you post about how this thing just shut off randomly and would not rev out right and installed a new stator, and still seemed to have running problems..

http://www.3wheelerworld.com/showthr...ad-crank-seals

http://www.3wheelerworld.com/showthr...nother-problem...


You posted pics of a severely scored piston here...http://www.3wheelerworld.com/showthr...00#post1246100

You posted pics of a major problem with the crank bolt coming loose and gouging the side cover and probably damaging the right side crank seal here...
http://www.3wheelerworld.com/showthr...aking-case-oil..

Now you are asking why it runs too rich..My guess based on your previous posts are that the crank seal is sucking oil on the right side, you have massive blow by due to a badly worn piston and rings, and I am willing to bet that your balancer bearing is shot too, and that is why the crank bolt worked loose..

My friend..You need to yank that engine and do a complete overhaul on it IMHO.
Other wise you are going to cause more damage and and just keep asking questions on why it does not run right and end up taking the advice of "buy this" or "get rid of that" from folks that may not know the whole story..

Not trying to be rude, but I think you bought a trike that has been neglected and it is time for you to fix it right and not waste money in the process.