OK, I have ordered a new cam chain/tensioner kit. After hearing the prices to get it done, I've decided to do it myself. Are there any helpful hints to do this? I will just follow the Clymer manual. While I have it torn down, should I do any other work to it? It only smokes on start up for a couple minutes and then goes away..so I'm guessing valves. The guy b4 me said he put new rings on it just previous to me buying it so I dont plan on doing anything with that. but will inspect the cylinder to see if I should just go up a size or so. It boggs down pretty good when climbing steep hills...any suggestions what this may be?

 

1....How many hours on the thrike since new rings were put in?

2....At start up when it does smoke, shut it off and pull the plug and see if it is wet from fuel or wet from oil.

Just a few questions to help us answer
Jeff

 

Haywood: i did as you requested, here is what i discovered. It appears to be gas on the plug, and the plug was very carbon covered. I'm assuming this means the ratio is way too rich? Or could it be the valve clearances?

As far as time on the new rings...i really don't know for sure (since i just bought it less than a month ago), but I would assume less than 10-15 hours. I do know that all the guy did was replace the rings...nothing more.

 

wrestleu

When ever I put new rings in an engine there has also been a new piston ond an overbore of the cylinder.

If the previous owner didn't hone the cylinder when he put the new rings in the rings might not be seating which could be causing the carbon build up and some of the smoke. Also maybe the piston to cylinder clearance is out of spec and the cylinder should have been bored over and a larger piston installed.

If the cylinder wasn't honed, I'm not sure how long it would take for the new rings to 'seat' or if they ever will. Thrash and Crash might have an answer for that.

Is there a way to contact the previous owner to ask him if the cylinder was honed and the piston and cylinder measured when he put the new rings in?

Does the engine start without using the choke when the engine is cold or do you have to choke it?

I will look up the carb specs and get them posted, maybe the pilot screw is a little off and there is too much fuel at idle which could also cause some of the smoking.

Jeff

 

OOPS I forgot in the 1st post you stated you had a clymer manual so I guess you can look up the carb specs yourself.

When you do the cam chain stuff you could also measure the piston and cylinder to see if you need to have it bored to the next size. The clymer manual should have those specs as well.

Jeff

 

On a 4 stroke the rings WILL-NOT-SEAT If nothing at all was done to the cylinder. If they had it de-glazed, or rehoned then they will be just fine. You HAVE to have friction to seat rings, or the cylinder will look like a polished mirror and the oil slides right on by [img]i/expressions/face-icon-small-happy.gif[/img][img]i/expressions/face-icon-small-happy.gif[/img]


Other than that Jeff is hitting the nail on the head!

 

when i go to pull the engine to do the cam chain, i plan to just do a top end rebuild. Where is a good place to get the parts? dennis kirk...bike bandit...any others? Also, what is a good size piston/rings to order to give maximal gain in power, but still allow for a possible rebuild in the future?

thanks again

 

Hello, I have a atc 200s they are the same motors, and i have had every problem you can imagine. The bogging down part would be your centrifugal clutch(they are about 50 bucks). The smoking is the piston, but right now i wouldnt even worry about it. Ummm and to put the chain in, don't even bother with a new chain tensioner. But any ways you take the cdi off the head of your motor then take the sprocket off of your cam shaft, then you have to take the pull start off then the flywheel and then the next section of the case and you should see the bottum cam chain sprocket, now you can slip the chain off the cam shaft (dont be affraid to bend your old one), once you get it to drop down get the old chain out of there tie some wire to your new one and feed it up through and put it on your bottum sprocket then slip the chain back over the cam shaft, and put everything back together. Thats how you do it without rippin the whole freakin motor apart and without ruining all your gaskets. The cam chain will stop most of the changing coming from your motor and it will idle A LOT better. And dont be affraid to get the chain pretty tight. There ya go.

 

No Offence.........BUT that is the worst advice I have heard!!!!!!!!
1. wrestleu has not given enough info to say he needs a new clutch!!!! (carb problems or the engine worn out could cause this also!)
2. If you are so sure the piston is doing the smoking....Why do you say to not worry about it???
3. CDI is not mounted to the head! The part you are talking about is the "Pulse Generator and Rotor"
4. LMAO....And to not replace the chain guides is NUTS!!!! ever pulled any out of a 20 year old trike? There trash!

5. I'm pretty sure wrestleu is looking for an engine that A) WORKS...B) and he doesnt have to work on every day.





Good Idea!!! I get my parts from Bike Bandit, and Hyperparts Get the smallest piston you can get by with...It is usually best to get the cylinder punched first, Then order your piston. If you have a stock piston right now...a +.020, or a .030 would be pretty normal.

 

ok, thanks. So to get this straight I don't need the piston first? So when I take it to a machine shop they can bore it over however much and then I can just order the piston to match? Sounds good to me. Since I will now have a spare motor that will make life much simpler. Figure I'll just run the crap out of the one that is on it, and then put the new one on when this one kicks the bucket. Will a machine shop know if the cylinder has already been bored before or should I get a caliper and check the diameter myself first?

Thanks again

And yes...my goal is a reliable trike. I want this thing to start on the first pull every time (which it does now), and to be able to idle (which it does not).