Last night i was driving my mt2 and it was acting a little strange. like its idle was strange. then just when i was about to go get it to turn it off it revved way up like some gears were slipping or something. i am a beginner with this kind of stuff. so could someone tell me what they think it could be.

Have you looked to see if any thing is missing or stripped? Is there a possibility that it ran out of fuel? Right before they run out they will rev really high for a few seconds and then cut out.

I don't mean to point out some of the obvious problems but you really didn't give us a whole lot to go on.



rolland

ok thanks it was probably just ran out of gas because i didn't see any chewed/stripped up teeth

Check servo linkage to the carb also. One time my engine was running oddly and when I took a closer look I discovered the screw which fastens the arm to the servo and carb was loose.

I would also check that the batteries are not low on power. When a battery starts to lose power, the servos 'twitch' as they try to find neutral. This sometimes results in what you are describing here. It could also be that there is some metal to metal contact somewhere that is causing the electrics to play up.

if u have a fuel filter fitted, check that it is clean - ie flush it out with fuel.

ya i had that problem, but it was dirt in the line

I tried running it again this afternoon and it just revved up and didn't go any ware. so i think it might actually be some teeth that are stripped/ mushed down on the bigger of the 2 plastic gears. I think i know what part it is but just in case could someone tell me the part number of that gear and if there is any kind of upgraded/metal one like it.

I had a problem once where I lost the set screw out of the "Center Joint Cup" (part #FF047). Since I only lost the one out of the front, the back wheels would still turn, but the front wheels stopped pulling. If you look at the shaft that comes out of the transmission and goes into the differential, there is a small set screw that holds the cup onto the differential. These are very cheap if that's the problem. It is worth a quick look and you don't have to tear anything apart to determine if that's the problem.

sounds like either the clutch spring has snapped or the spur is in need of replacement - or both

If your engine revved up but the car didn't move then the problem will most likely be pretty close to the engine itself. Try the clutch to see if the shoes are worn down, clutch bell and spur gears to see if there are any teeth missing and that the gear mesh is nice and snug.

A place to start if nothing else would be to prop the truck up on a box or block of wood just so the tires rotate freely in the air. Take the top off and start the truck and with very light throttle you should be able to the drivetrain parts moving. You should see movement from the clutch bell, from the gears, the main shaft, the swing shafts and finally the tires. Just follow the drivetrain and you should be able to see where the movement stops. That part would be my first thing to look at. Just a thought.

Here is a link that you need to book mark. http://www.toyhaus.com/ff2wdmt.html
On the same page as the link there is a link to a 2 speed diagram that will have the part numbers for the spurs.
You don't have to order from them any of the vendors mentioned in the CEN forum will have the parts just pick the closest one. It is just an easy way to find the part numbers and to see how it goes together.

It sound like the problem is either stripped spurs or the gear mesh is wrong. If you do a search for "gear mesh" in the CEN forum it will save alot of typing by me or someone else.


rolland

Davecenmt2, did you have any luck figuring out what was wrong with your MT2?

yes i am pretty sure i did. i think it was the bigger of the 2 spur gears. the spot i said looked a little stripped was causing the pinion gears to not be able to fit in-between the notches on the spur gear causing the whole engin to push away enough so that it wouldn't spin the spur gears.

thanks every one for your advice.....and alvinl for your advice of going though all of the parts to see where the movement stopped

your problem lies there with the engine mount screws - either u forgot to threadlock the screws or they worked loose regardless. this caused the damage to the spur gear by the sounds of it. we have all done it im afraid.

i would replace the gear, and maybe get a couple of spares, as they dont last forever, and ensure the mesh is correct and the engine mount screws are tight and threadlocked once u have fitted the new spur gear.

all the info u need and tonnes more is under that search button - but give us all a shout if u get stuck.

This post got me to thinking that it's been a while since I checked all the screws in my funfactors. Sure enough, I had a set screw backing itself out. Added a little thread lock and that should not happen again.

Screws do need to be checked regularily and lock tight needs to put on the metal to metal screws. Those little nitro motors vibrate quite a bit.


rolland

Hey guys I am new at RC cars so I need a little help here. I have a Cen MT2 and it is always chewing up spur gears, I have replaced them 4 times already and have driven it a very little. I also noticed that it hesitates when I try and accelerate. The last thing I noticed was the steering servo wasn't working and I thought it was the batteries so i changed them and it still won't work. Your help will be very helpful and appreciated.

dead spur gears are a result of one of 2 things - the engine mount screws working loose (use threadlock and get them nice and tight) or small stones etc getting in the gears (thats just the way it is)

the engine bogging down is probably the tuning, try leaning it out a little. the hi speed needle needs the most adjustment, the low speed needle needs little if any adjustment - presuming of course that the engine is fully run in.

as for the steering servo - cens radios are very basic and pretty unreliable. i would try the throttle servo in the steering servos place to be 100% sure that u didnt get another duff steering servo. if the throttle servo wont work in the steering socket on the reciever, then its the reciever thats dead, i expect, i doubt it will be the transmitter. i have replaced my stock reciever with an acoms one, no probs since. its worth running a higher torque servo for the steering and using a rechargable hump pack to powerr them - i use a 1200 hpi pack.

hope that helps

To tight of a mesh will kill the spurs pretty quick. Not having the engine square with the spurs will also.



rolland

I ran my MT2 today and within 5 minutes of driving the spur gear was done. I brought it to my local hobby shop and he said the engine was on tight and that it should be fine but it wasn't. I also checked for small pebbles or rocks but I didn't find any. I am going to take it back to the shop tomorrow and have him look more and if he can find anything else that is loose or wrong.

hmmm - try the clutch bearings - the ones inside the clutch bell, they sometimes seem ok, but once the power gets up, they loose their alignment. just a thought.

well i just wanted to say that i got my new spur gear on yesterday and drove it, and it worked fine

Thanks for the insite my gear spur has been stripping constantly and I couldn't work it out.