Is it the crank seals?

[Mosh]

Oh I will just add..
When a crank seal is sucking oil,,,YOU Know it...
They smell like ass.....

[Billy Golightly]

This sounds exactly like my 250R thats possessed. The smoke clouds are even of similar volume and shape Its frustrating, isn't it?

My plug looks different then yours, but I'll have to agree with a statement made above about the headgasket. Your getting coolant into the cylinder, and its steam cleaning the plug and everything else inside the combustion chamber. Only way possible for it to run and look like that without the piston being holed.

It could also have a bad crankseal. Are you losing oil in the trans? With that kind of smoke volume it doesn't take long for the fluid level to go down, trust me. I've also found in the past, the seal collar on the clutch side can be installed BACKWARDS. The deep end of the collar should be pointed OUT, AWAY from the crankshaft. If it is not, the splines leave area for the seal to be broken and oil be sucked into between the crankshaft spline trenches and the collar.

[Dirtcrasher]

Oh I will just add..
When a crank seal is sucking oil,,,YOU Know it...
They smell like ass.....

I guess that depends on who's ASS your smelling

[Brad200X]

Well good on the carb then...

Here is the deal.I see what you want to do.You want to know EXACTLY what it is making it do this...

Ok so say, you tear it apart,then find it was just a head gasket, or crank seal.
You put it together, the smoke goes away,and then you just say well great.
I am running the Crap out of it..

6 months later, the crank bearings give out....
Then where are you at????
You are out the time and money for the first fix,becuase you have to go back through and re fix something else.

I still agree with DC...
Anything that sits for that long, is bound to be on borrowed time...

X2 If your pulling the thing apart there is no reason for you NOT to replace the crank bearings, and every bearing that's bad. All of the seals, replace those too. Sorry man I was speaking a little out of context earlier on the bad crank seals, as I've never had a bike that had bad ones, and that I didn't have to completely rebuild, so I don't know the symptoms.

[Twilight]

The difference is that it has SAT for a long period of time. And like most Honda's, it's running on dried out crap........

Do you want to ride it for awhile or for as long as you own it???????????????

Everyone is in too much hurry to ride, thats the biggest problem.

Other than that, keep the post going and let people tell you it's the stator, CDI, WP seal, bad kickstarter and the air filter or whatever........................

I promise not to say I told you so, fair enough??!! BTW, I'm known to LIE!

Why attack me? I NEVER said I was going to find the problem and that would be the end of it. Instead of starting something and making accusations, why not just ask questions? I said I wanna go through it piece by piece and find out what is doing it. I want to learn. I have all the components to rebuild this bottom end on order. Also im going to redo the head anyway with a 1989 cr250 head gasket, its copper and is thicker.

moshman- same thing. I never said I would rebuild only until i found the problem. I dont care if a engine is running great, on any bike you need to have it checked out and looked at. I like to hear opinions on what may be causing the problem. Again I am going to say, whats the point of doing it all, when you cant learn from it?

Nobody asked for info on the carb or what jets I used, if you want to know, just ask. I have no problems with that. From what I saw in the carb 48 main jet and the carb is PJ05AAAB. From the manual looks like the 86 carb

[2quicktecate]

i have had good luck with my 2 strokes that sat for ever, new gas and a carb clean and they run like a champ. did it have coolant or water in it. if it was straight water it could have corroded the headgasket

[Twilight]

has coolant and water. moshman was right about the smell... and this smoke doesnt smell like how the pilot did..

hmmm?

[Billy Golightly]

One thing I've learned/noticed is, for some reason, coolant doesn't seem to go down nearly as quickly as you would think it does when its getting in the motor. I don't know how it doesn't, but it doesn't. Change your head gasket and plane your surfaces is my suggestion.

[Saul]

99% sure it isn't your problem, but - for shits and giggles I put a shorter/smaller needle in my 34mm PJ carb and fired up the trike and it POURED out clouds of white smoke identical to your pics.

Just 'throwing' that out there.

[Twilight]

... I hope your not being serious, because literally. I took the old needle out that had a bend and put this one in, both LOOKED the same size

Know what size needle you have in yours now? Is yours a round or oval slide?

Billy, you are right about that. I will be checking it when my gaskets get here.

[Saul]

... I hope your not being serious, because literally. I took the old needle out that had a bend and put this one in, both LOOKED the same size

Know what size needle you have in yours now? Is yours a round or oval slide?

Billy, you are right about that. I will be checking it when my gaskets get here.

I'm dead serious. When I saw your pics I was like 'holy - thats exactly what mine did!' - and my trike doesn't smoke clouds of white on the right needle - I go out and start her now and I get the usual puffs of blue but after minute or so it clears up.

When I put the shorter needle in and started it up it was INSTANT and HUGE clouds of white smoke that filled my garage in lss then a minute ten I shut it down and pulle the neeedle and put the proper one in.

As for my carb, I'm running a 34mm PJ Keihin with a gold needle stamped DEG.

Your needles may 'look' the same but double check the ID letters stamped on them to make sure. You have length, diameter and taper to consider - but mostly your length and diameter will be the biggest thing to check.

Again, more then likely it's NOT your problem but it's worth checking since you have a mystery carb and now a mystery needle in it too.

[beets442]

+1... on checking needles and head leak. I've had the same number needle not work either.The length and daimeter are right but the taper is off. Ended up putting the old back in. Never throw the old parts out. Good luck, Beets

[Twilight]

Im going to have to get a new needle another time to try that. My parts order finally came through, yay.

2quick, is there any place around here that has parts for the trx250r or atc250r? i dont know of too many shops.

[2quicktecate]

bent bike, my friends work at northwest sand toys and they deal with 250r's alkso south bound honda has some cool people that build r's and they have some parts in stock...

[Twilight]

Sweetness, thank you sir! I will give them a call tomorrow or Friday.