I need 225dx help

[mike11743]

Hi guys!! I recently picked up a 1984 YTM225dx and need some info on it. What are common prbolems I should look for? It currently does not run and the guy says that he keeps bending valve anfter valve. I asked him if he timed it correctly and had no idea what he was doing when he rebuilt it. He said that he bought it with a bent valve and then changed the valve and let it idle for about 10 mins and the valve bent again as soon as he gave it gas. This is what he claims. I would think that speed of the engine wouldn't affect it because as the piston moved faster, so would the valves.

So I brought it home and got it all torn apart. The brand new exhaust valve in here was sitting on the piston. The piston and valve both appear to be okay. Basically i think maybe he had the timing off and went to start it and the valve hit the piston and locked up the motor and he didnt want to mess with it anymore. I would think the valve would be bent if the motor had been running when this happened. Does this sound right?

So after tearing it apart, I found that the aluminum collar that holds the camshaft in has a small amount of play. That will be fixed after I do the basics to get this thing running to see if the tranny and rear end and that is all good. But my main concern was that the exhaust valve only opened a tiny bit until I adjusted the bolt on the rocker arm. now it opens about the same as the intake valve, but the adjuster bolt is pretty much bottomed out. Also, the gap between the rocker arm and top of the valve spring on the exhaust side is like half an inch. I measured this by simply lifting up the rocker arm while the tension from the camshaft was not pushing down the spring. I'm sure there is a technical term for this measurement. I can do this to the intake side, but the gap is so small that it would need to be measured with a feeler gauge or something. I would take it as this is not normal and could be what is causing my problems. Or maybe the guy just didnt have it timed right. I wish I would have checked the timing before tearing it all apart lol.

[RubberSalt]

Alright, now that you have the head off.. I'd go and replace the valve guide and valve spring on the intake side. I'd also check to make sure that rocker isn't getting stuck or is gummed up. After that, check the valve spring, it's possible that it's not closing the valve fast enough, and the piston is hitting it.

[YoungJay]

it sounds like it isnt timed right and the piston hitting let us know what happens mate try that rubber said i have a 225dx also no problems yet but the breaks and front fork bent haha.

[mike11743]

thanks for the advice and tips guys. The spring and valve guide look new in addition to the valve on the exhaust side. I would assume they are good, but even new stuff can be bad sometimes. The vavle does not have any visible bends to it, so to make sure that it is still straight, I filled the exhaust port with water, and am getting like a very very small leak. Like a drip per minute coming past the valve. If i tap it with a rubber mallet, the drip goes away. I also cleaned it up with a brass wirebrush. I would say this is probably good to use then? Also i checked the rocker arms and they are moving freely. I am assuming the springs are fine because the valve seems to compress back after turning the camshaft by hand faster than the intake valve. It is also a little stiffer than the intake valve. I would assume this is because the spring is new. Thoughts?

[YoungJay]

im stumped lmaoo

[MonroeMike]

Read the manual for the correct way to set the timing and adjust the valves.
http://72.52.143.80/~trikes/ytm200&2...mer_manual.pdf

More.
http://www.3wheelerworld.com/showthr...5-Service-Data

[RubberSalt]

It sounds like it's good to go, that 1 spring is probably stiffer because it's new. I wounder if the chain tension is letting the chain move where ever it wants. At low RPMs it might not be noticable, but a lose cam chain would change the timing I'd imagine. Go with the manual on checking the train tensioner.

I'd go ahead and replace that intake vavle, other than checking condition for the tensioner, sounds like it's good to go.

[mike11743]

I know that the chain was tight when I pulled it all apart, so I presume the tensioner is doing it's job. I had everything working on the tensioner when I took it apart. That does make sense though.

[mdwohleber56]

timing on these things is a huge pain in the butt. it sounds really simple and easy and when doing this u think the same thing. you really have to make sure the chain tensoiner is good because it can feel tight when u push on the chain with finger but when u turn it it slips and jumps around. basicly on the top cam head make sure the notches r lined up then when looking throguh the timing window (left side of engine big flat head screw looking plug) and make sure u can c the T in the window when the notches r lined up. and then while making sure everythings still in place tighten the chain tensionerand then give it a pull be4 u put the covers back on to make sure the chain didnt slip.

[mike11743]

well i'll be putting it all together this weekend as soon as my gasket kit gets here. I figure the aluminum cam bushing has very minor play in it, so ill just do that after i get it all timed and back together and hopefully running. I just want to make sure that it can run before putting too much into it.

[muthey]

in my opinion if you think the cam has too much play I would replace it before trying to run it, before it possibly bends another exhaust valve is best too make sure everything is right before you have to tear it apart again

[mike11743]

I have a couple quick questions for someone that is familiar with these trikes,

My headlight does not work when the battery is hooked up. The neutral light lights up, and the starter works, but no headlight or tailight. After looking at the wiring diagram, it looks like the headlight might run off the stator. Is this so?? I would find out myself, but the head is off, so i cant start it. Also what about the tailight. By looking at the wiring diagram, it is obvious that it is run off the battery, but maybe it needs to be running to work. Brand new bulbs and all connectors, grounds, and wires are good.

Another question. Can I run this thing without the starter gear. This is the one on the inside of the case. I plan on doing it eventually as my funds allow.

[muthey]

the head light and tail light both work off the stator, battery is pretty much starting only

[mdwohleber56]

hey mann i have two of these engines im doing overhuals on. now i believe without that lil starter gear u can still start it using the pullstarter or by jumping it, but the electric start will not work if u have it id put it in if u dont id just get one not very exspencive and u really dont wanna keep opening and closing up the engine cases the gaskets will break trust me i know. with the starter gear there is also a metal rod and a silver colar if you dont have those buy a set off ebay. lots of parts for these trikes on ebay or ask some of the people on here i got a guy hooking me up with like $400 worth or parts for 215 bucks that i met threw a post

[mike11743]

I don't have it, but i did find one on ebay. I just got the gaskets today so ill be putting it toghther before the startr gear gets here.

I also have a couple more questions. I the valve clearance values in the service manual, and I am nowhere close. This is the clearance between the rocker arm and the top of the valve when the valve is closed right? I can move my intake rocker arm up like half an inch, nowhere close to the fractions of an inch that it is supposed to be. Obviously i'm either doing something wrong, or something is messed up.