Hey,
I am newbie and I purchased a Cen MT2. I broke the engine in as per the instructions. I ran at least a quart of fuel up and down my street. No problems. I got talked into trying a local dirt track. After a few runs, I heard a terrible noise. Form what I have read, it was the two 2-speed gears. They are red on the MT2. The teeth were a mess. Is this type of thing covered under the warranty? I am not to thrilled about taking it apart to replace them. How difficult will this be? How do I keep it from happening again?

Thanks for any help,
Jeff

no it is not covered under warranty... you stripped the gears either due to incorrect mesh, loose engine screws, bad crash or truck was stuck and you continued to floor it..... This is a great truck, but there are some things that you have to do before you go out.... Tighten screws.......#1 reason for gears stripping.... It is not difficult to fix... I can do it in about 10 minutes now... You will need a split ring plier..... Buy an extra set... You'll eventually need them.... and locktite any metal to metal screws.. Nitro engines are known to remove all screws that are not glued in....

I ordered the two gears. Are there instructions out there on how to replace them? If you can point me to a post on gear meshing 101, that would be great. Thanks!

I hope you are handy or have a friend who can help you... You have to take off the complete rear assembly... screws on bottom of chassis, comes out as a unit... the rest is easy, make sure you have a snap ring plier.
The best way to mesh the gears is to take a piece of notebook paper and fold it in half... when you are ready, place this between the gears and the spur gear... push tight and tighten bolts on engine. remove paper... now you should have the proper mesh.... once you get good at this, You should be able to change gears in about 10 minutes and adjust gear mesh in about a minute or two......

Cenracer is correct, it is quite easy. The only "special" tool you may need to find is the snap (c) ring tool. Everything else is quite easy. Make sure that you keep your pit area clean when "wrenching" on your vehicles so that you will not loose any items, screws etc.

CEN RACING

Okay, I got the rear end off. I took off the brake part. Now I can't get the gears and the shift clutch off of the rear end. How do I do that?

holding the assembly with the gears up... look at the shift clutch... you will see 2 set screws..(turn the top gear until the hole lines up) the set screw that is NOT angled is the one you want to loosen... only a little bit.... carefully remove the shift clutch (remember which way is up)... no you can remove the gears from the shaft.... separate the gears, remove the top gear and use the snap ring plier to remove the other one.... Reverse the process to put it back together... take your time, If you have to pry something apart, you are doing something wrong........The gears are snug but not pressed in..... Have fun......

Yes,

The shift unit is held on with a 2mm set screw. You will need to loosen
this before taking it off. Once you get the shift unit off your spur gears
will slide off. Thanks for you question.

CEN RACING

Cenracer1,
I did loosen the set screw and was able to slice the clutch off of the shaft. I pulled the two gears off the shaft but them would not come apart. The bearing one the first gear would not come off of the part in the second gear. When I used a screwdriver to pry the two gears apart, the bearing got messed up. The pliers worked great for the second gear. Now I have to order a new bearing.

As far as the clutch part, do you mean I need to make sure I put it on so the set screw hits the flat part of the shaft?

Thanks so much for your help

what happened to the bearing..... I had mine apart last night doing cleaning... mine slide apart no problem... you may have to wiggle it a bit but that is it...... Did the bearing fall apart? It's metal so kind of hard to break.... The reason I said to make sure the shift unit remains upright is because if you put it on upside down.... It won't shift.... make sure you remove the little screw to remove the bearing from the gear... (tiny philips head at center of gear )... this is maybe why you had trouble with the bearing.

The bearing would not come free from the second gear and the one way part in that gear. I tried pulling them apart and nothing. I had to stick a flat head screwdriver between them and try to pry them apart. The little tiny screws were already out. The bearing didn't break, it just lost its nice round shape. As you know with this type of bearing, the gear would not spin right after that. It finally poped off but the bearing is unusable. ANyway I ordered a new bearing and hopefully it will go back together.

Now this is a brand new truck. I broke in the engine just as the manual states. I even took it easy for the first six tanks of gas. While I was taking this truck apart, I have not been able to find any loose screws. The engine section will not move at all so I don't understand how the gap became so large as to eat the plastic gears. I will chalk this up as a learning experience because I can change these gears now without help. Now I can contribute to this fourm in a small way. I do have to learn how to gear mesh or whatever to keep this from happening again. This truck is all road and a little bit of grass now.

As a CEN expert, is there a way to create a post that gives DETAILED instructions to do certain things for newbies. I would love to be the first one to write detailed instructions on how to change the gears on a CEN MT2. Next I will be wanting to replace the shocks or something.

would be nice to have a section on how to fix and upgrade truck...... Why not be the first.... I know I will contribute to it....

I received my bearing today. The bearing went on the ony way hub much easier than the old one came off. The set screw in the clutch drum was hard to turn but I think it is on the shaft good. I got the rear end back on and sure enough, the gears were were too far from the ones on the engine part. I haven't learned the gear meshing yet but I turned the truck on its side and when I lossened the screws on the bottm holding the engine, it slide down a hair. Can the gears be too close to the gears on the engine part? I think I remember something about the width of paper.

I will get to work on a thread on how to change the gears on the MT2.

Yes they can be too close.... Will bind... too loose will strip.... Place a piece of folded notebook paper between the gears and the clutch bell(spur gears) tighten down until paper is snug between gears... remove the paper, now you have the correct mesh... If paper comes out all chewed up.. you have it too tight.... Once you do this enough you will see how the mesh is set... I do mine by eye and feel... Don't do this until you are very experienced or you will destroy gears all day.... also, please check and make sure the chassis is not bent in the rear..... are the gears meshing straight ? sometimes that can be a problem especially after a hard crash on the tail of the truck.......