1984 atc250r too much smoke

[Islandbiker5000]

Hi everyone. My names chris and im new to this site. Im here in oregon ridin the dunes. Ive always had trikes but in 4stroke. I just recently bought a 250r honda and i have no idea about them. I have an issue i was hoping someone can help me. This trike seams to somewhat bog when i nail the t throttle. It smokes way more than other 2strokes. Everything is factory on it no mods. I have done: cleaned the carb. New oem airfilter.new plug. Factory airscrew setting. 32:1 synthetic mix. It smokes alot. When i get on it hard it really smokes alot and is sluggish. Sometime it will hit the powerband hard but only sometimes. Has anyone ran into this problem. I really want to ride this this summer.

[RIDE-RED 250r]

Welcome aboard!

Sounds like the first thing you need to do is look into dialing in your jetting.

If you aren't sure how to go about dialing in your jetting, this thread should get you well on your way to BRAAAAPIN good and proper! http://www.3wheelerworld.com/showthr...Jetting-Theory

[Islandbiker5000]

Ok i will start there. Thanks for the link i really apreciate that. Do you think do to that due to age the stock jets arent any good anymore?

[barnett468]

Ok i will start there. Thanks for the link i really apreciate that. Do you think do to that due to age the stock jets arent any good anymore?

Helllo


Jets do not wear out.

1. Do a compression test and tell us what it is. Around 160.0 is good, less than around 140 MAY be new ring or bore time etc.

2. What color is the smoke ie, white/lite gray is oil, very dark gray/black is excessive fuel.

3. Does it “burble/sputter” on acceleration [too rich]or does it simply not “go” [flat spot].

[RIDE-RED 250r]

No, jets really don't "wear out". They can just get fouled to the point you can't get them adequately clean by conventional do-it-yourself methods.

Most things like wheelers, sleds and whatnot that came with 2-stroke engines were jetted from the factory a little on the rich side for the most part. There are a few reasons for that.

If you engine has richer than OEM jets installed, it's likely the reason is due to at some point in it's 30 years some modifications were made to it. It's really hard to say though.

Do a quick compression test on it to make sure compression is up to par. I am not sure what numbers the Air-Hammers should be at. I'm sure if you search that topic plenty of results will pop up.

If that checks out, then proceed with your jetting adjustments.

One of 2 things will happen, you will either get it dialed in and running the way it should. Or you will have trouble dialing it in and chasing your tail round in circles. If the second scenario is the case you have other possible issues and we can help you through that a step at a time.

But for now, check compression and jetting and get back to us..

[Islandbiker5000]

It somewhat sputters when i nail the throttle then it takes a second and then the powerband hits kinda. The smoke is white. It just doesnt feel like its as fast as it should be

[RIDE-RED 250r]

Sounds like it is too rich by the way you describe it..

Does the sputtering occur below 1/4 throttle or 1/4 and higher?

If it occurs below 1/4 throttle then your pilot jet is the one you want to be looking at to dial in better.

If over 1/4 throttle, then the main jet and possibly slide needle position is what you need to look at.

[Islandbiker5000]

Ok ill do a compression test and mess with the jetting. The plug is black and sooty also. Ill try it and ill let you know. Really thanx for the help i really apreciate it

[RIDE-RED 250r]

No problem.

Post a good pic of your sparkplug.

Black and sooty is a classic sign it's too rich.

[barnett468]

Ok ill do a compression test and mess with the jetting. The plug is black and sooty also. Ill try it and ill let you know. Really thanx for the help i really apreciate it

Hello


Thanks for answering my questions so quickly and in good detail.


The following are my suggestions only, others will have different ones.

You may have 2 problems as I described. The compression numbers I asked for will help a little, unfortunately compression gauges often vary from gauge to gauge by up to 15 psi so the numbers will just be a general guide.

The "white" smoke you describe is oil as I mentioned, your rings may be worn causing low compression, low comp can cause an otherwise properly jetted bike to run rich and/or have low power feel and burble upon acceleration.

The "burble" is typically rich however a carbon fouled or otherwise loaded up plug etc can occasionally cause a similar feel.

Install new plug, try again, check color after 30 min riding, if burble still exists reduce main jet by 2 sizes and try again. Check plug color again, lite tan is good, dark tan is slightly rich, DRY dark black is too rich, any moisture on any color plug is oil.


Hope this info helps

[barnett468]

Hello


If you find your jets to be plugged slightly [which is unlikely since your bike sounds rich] and you can't get them clean you can simply take a "number" drill of similar size to the jet and spin the jet around on it with slight force. Done this many, many times works great and dies not damage the jet whatsoever.

If you get the number off the sides of your existing jets that Ride RED was referring to then please post them as this info may help.

[Islandbiker5000]

My pilot is 50 and main is 130.

[barnett468]

My pilot is 50 and main is 130.

Hello

Thanks for the info. T factory main is 158 there is nno mention of the pilot jet size but 50 is close enough for now. Are you absolutely 100% positive you main says 130 not 150 or something.


1. What is your elevation?

2. If your main is 130 then your bike is majorly LEAN, this is a major part of your "bog" problem, please install a 155 for now.

3. Your excessive white smoke means your motor is burning oil which means your compression should be low. Low compression will also cause a bit of a "bog" condition. No compression, no power!


Let us know

[barnett468]

CORRECTION - Your oil smoke may be caused by a bad right crank seal sucking oil from crank case however it will typically [but not always] idle high due to an air leak if this seal is bad. You may need to have a crank case leak test done.

Exactly what type of 2 stroke oil are you using?

[barnett468]

Stock jetting on the 83-84 250r.is 130 on the main 50 on main.

Hello Islandbiker and ATC 300R


That's not good to hear, why is the Honda manual different?


81-84 ATC 250R OFFICIAL HONDA MANUAL JETTING PG 3-1 MAIN 158 AIR SCREW 1 3/8

http://www.oscarmayer.net/atc/manual...vicemanual.pdf



85-86 ATC 2506 OFFICIAL HOMDA MANUAL JETTING PG 3-15 MAIN 142 AIR SCREW 2

http://www.oscarmayer.net/atc/manual...vicemanual.pdf