'82 Tri moto 125

[kasey200x]

I bought this bike this week, i paid 200 plus some wrench time on a old lawn mower. It is a very nice little bike, but i have a few problems with the carb. First of all the choke is broke, by the switch on the hadle bars. It seems to be reliabilty vs. power
I messed around with pulling the choked in and out, half way out, and different positions and it was giving me different results every time. One time it would run great half choke, then it wouldn't. The issue is when i'm riding it after first gear it will not exceed.. half throttle? It just feels like its not getting enough fuel and kind of sputters and keeps a steady pace. Feels like it is slowly slowing. I pulled the air box lid off and it has a type of strophome fabric. It was a gigantic wad of the stuff, so i cut it and made it just enough to cover the whole then put a zip tie around it. That helped the bottom end a considerable amount. Still, nothing on the top. After a few hours of piddiling around with the screw on the carb, and the the clip in the slide, I decided to take the air box lid off. And WOW. My girlfriend actually said "why's it going so fast?!:eek: " as she was squeezing my back. It really suprised me as well. Anyways, after this it wants to bog down really bad. It will even die if your not careful. After about ten minutes of riding, it would die in first gear. So i switched the plug, fired it up, took off.. and it died.



AND now im here. I'm exceptionally happy with my purchess, and would be even more so if anyone could help me get this fixed up!!
By the way, the carb has been thuroughly cleaned.

All help is appriciated!

[broncbob]

What did the plug look like that you pulled out? How old is the fuel, and what does the inside of the tank look like?

Make sure all your jets are clear. It may help to have a rebuild kit on hand. check for any visible damage to the intake track, lose clamps, cracks and what not. Get your self a real air filter for it!

[kasey200x]

The plugs look real dark from the electrode up about three or four threads. They still fire though?
And i made sure the jet moved in and out with ease, and i took out the other and cleaned really good with carb cleaner.
What would be nessicery for me to block off the oil injector? I'm kind of skiddish with these as they have caused big problems for me in the past.
Thanks!

[broncbob]

It still has compression after it's speed burst right?

A black plug on a 2 smoker means rich, bad rich. But when you pulled all the stuff out of the air filter and the lid off the box you allowed more air in, and leaned things out. Running lean is evil for the 2 smoker, they literally burn down! The piston melts off around the exhaust port normally.

I would get a good compression check, check the intake for leaks, put a real air filter on it, put the lid back on, check the jets in the carb and make sure they are the same size as stock, block off the oil injection and mix with Klotz R-50 at 32:1 unless I could find the correct mix ratio and put a new plug in and start tuning!

[kasey200x]

Alright i'm wanting to block the oil pump off, what is nessicery to do this? Can i just take the hosses off and just leave it there?

And what do you mean by does it still have compression after speed burst? As in dose it still run?

Thanks,

[broncbob]

the pump might drool oil for a while if you just pull the hoses. I would remove it and make a plate to cover the hole with some sheet aluminum and make a gasket out of some bulk gasket material, or use some threebond or RTV even. I'm not sure if it opens to the crank case, but air leaks are bad news!

I got that it runs, but dies after the air filter box mod. What I'm worried about it that you may have hurt the top end. The compression check will tell you the health of the top end if you know what it should be.

[kasey200x]

Oh! Alright, I understand now. After I replaced the lid it runs exactly as it did before. And unfortunatly I dont have any way to check the compression level.
About the carb, you said to see if they were originals? Is there a way to tell what jets it has? Like a number on them or something?

And if it makes a difference the choke is messed up. The cable is broke, and it makes it hard to adjust at all.

[broncbob]

The jets should have numbers, and if you dig around on line you may find a scan of a service manule, it should have the jet sizes in it. If you strike out on line, ebay may be the next best bet.

Your local auto parts store should have a compression gauge for 15-20 bucks.

The coke cable thing sucks, if the choke is closed it's going to run rich no matter what you do. Ebay may be the place to look, you may want to hit bikebandit.com and see if the have a price on a new one so you don't over pay if you find a used one.

[kasey200x]

I just went to start it and it was flooded extremely bad. I could see gas/oil sitting in the intake book. So I turned the gas off and pulled for a few minutes and it cranked, so I ran all the fuel out of the carb then cut the fuel back on and it started to run as usual.
I'm beginning to get worried about it, I bought this for my family cause i figured it would be reliable. Without having to put money into it.
Right now i'm in the process of saving up for a truck. And I'm not really wanting go further with putting money into the YT, so i'm considering selling it as is, and just buy a new motor for my 200x with the cash. That way I have a reliable 4-stroke, and possibly come out on top with a profit. Even still, I would love to have this bike. IF I can figure out the issue.

Thanks bronc, for the replies and help!

[kasey200x]

None of the screws on the carb seem to change anything. Theres only two, the larger one with the spring, and the little flat head one on the back. After I turned the small one the tiniest bit, the bike will no longer idle. Any ideas?

[broncbob]

the small flat head is the idle air mixture screw. The other should be the Idle speed screw. It really sounds like the carb needs a rebuild.

[kasey200x]

Okay, I rebuilt the carb again. It had gotton.. more gooky than dirty. Is there any way to clean out the oil container? It has some bad dried up oil on the sides of it. Or does anyone know exactly how removing the oil injection is done? Do i need special tools to make a plate? Or can i just close the wholes off?
I have a gallon of 92octane with good oil in it already mixed, and i would like to run it through her to see if it fixes the problem.