I crashed my trainer last fall. I built a new plane. I am trying to use the old engine ev0 46.

It ran fine for the past week or two when taxiing, now it wont run worth a crap.

I have put the low speed needle at 1 1/5 turns and every where around that. I have had the high speed all over the place.

Usually when I increas the throttle it just dies. Then I can mess around with the high speed untill it will rev up to full rpm's, back too idle, seems good. But when I leave it at full throttle more than about 5 seconds it just immediately dies. Any one have any suggestions? I have a feeling if I get any responses it will be common stuff I already tried, but maybe someone will have an idea I havn't tried. If I can't get it straighten out pretty soon I am gonna toss it.

Thanks,

Wings

have you given any thought about the tank? is it the old tank? could it be leaking pressure through the cap or line? like you said..probaby already checked that..but it sometimes causes weird problems

I can't really see that tank, but when I blow on the exhuast line [sm=stupid.gif] I can tell the tank is pressurized because unless I open the high speed needle no air flows. But.. I do notice some air bubbles in the fuel....

in the fuel line? air bubbles in the fuel line will cause exactly what you are having. does the tank have foam around it? try placing more foam around the tank. or make sure that the tank isn't up against solid wood somewhere. the high speed of the engine causes vibrations..which causes actual foaming inside the tank.
when it is passed down the line the engine doesn't get enough fuel to maintain the high speed. start there

I guess I can try that. The problem is..... There is no access to the tank really. Its a four star 40. There is a small hole. But I can try to stuff it with something. I hate to rip the plane apart when its a problem with the engine.

Another piece of info I didn't mention is that when the trainer crashed the carb got knocked off. I think that may be a possible cause. I put sicone around it, it didn't help though.

You may be right with the tank, but again, I hate to rip the plane apart.

Thanks,

Wings

It is a pain to drag the thank out.. but it can be done. You don't have to rip the plane apart. You do have to remove servos (usualy) and might have to knock the servo tray out. [:@]

If you were smart (or properly advised...) you added packing tape on the tank in a manner to give you a pull tab to grab. Makes puling the tank out MUCH easier. the hard part is getting hold of the tank. It is t a tight fit, but it slides back fine once the stuff is out of the way under the cockpit.

T get the fuel lines back in... plug the lines onto some nyrod or something and pull them through the firewall with that. (you may have to remove the engine to have good access to do that.[:@] )

A total pain... but if you have a hole in the clunk line inside the tank... you HAVE to pull the tank.

This was one of the posts a while back. I saved it. I don't know if this will help but it's worth reading.
http://www.rcuniverse.com/forum/m_69.../tm.htm#694681

If you knocked the carb off the engine, I'd start there. Order a new carb to start with, chances are you've got air leaking in around the base, and that can foul things up pretty good. But if you're seeing bubbles in the fuel line leading to the carb, you have other problems too.
Dennis-

Oh, seems I'm not the only one lucky with the evo 46 here
Yes, I got exactly the same problem. Drove me crazy[>:]
I bought a brand new evo 46 with all rc stuff and being a beginner, I spent several weeks between posting threats here, checking all sort of things in my plane even based on the evo customes service suggestions (tank, lines, needles, glow plug, fuel type, you name it) and going to the field to see my plane with the same problem, over and over, dead stick, until I get sick tired of this engine and send it back to Horizon Hobbies for repair or my money back.
I just got the engine back from then today. Didn't test it yet, but as far as I know, they said they replaced the carb.
Will test it probably next weeked. Hope it works good.

Dispite many say this engine is the better ever, I didn't approve their quality control process and wouldn't buy another.

If yours is still under awarranty, sent it to then.

Nilo

Make sure the carb is on tight, make sure the O ring is ok under it, change the plug, and check the lo end needle. Sounds to me you have the low end too lean if it runs fine at high speed and when you go to low, it works for a second then quits, it sounds like it is starving on the low end.

DB,

I have a feeling you are correct. I don't think it is worth it to buy new carb though. This engine is in rough shape. I had to JB weld the exhuast to the crank case because one of the bolt holes is busted. The high speed needle is rippied off and I really need a new needles with the bar that bolts it to the back of the engine. I have already spend probably 20 bucks on seals and misc parts. I think it may be more economical and probably keep my sanity to just order a new engine.

The bubbles I am speaking of isn't continuous. Its a bubble every now and then. Is this a problem? I am thinking of hooking it up to the tank I had on my trainer outside the plane. This woudl tell me if it is the tank or not without going through all the trouble of removing the tank.

As far as EVO goes in general, I have no complaints. It ran great from the time I bought it till the time I crashed it. Its not their fault I can't fly, lol.


Thanks guys,


Wings

it sounds like your low end is too low if it dies when you throttle it up. turn it out a half turn to be extreme. start it up and open the high speed jet up about 5 clicks is my best guess. bring it to peak and then back down on the high end about 2 clicks. bring it down to idle, and wait a couple seconds. then, quickly throttle it up. if it hesitates, it is rich. if it dies, it is lean, however i don't think after richening it out that much it will really do anything. however, it is possible that if you crashed it, you damaged your high speed assembly and it is sucking air. your may have a pinhole in the line, your tank may be vibrating a lot, it could be a number of things. ps. if your tank is not accessable, cut a hatch in the top. they are wonderful.

I think you need a new engine. A guy at our field has the same issue with a Hobbico trainer and what we found is that because his carb got knocked off and was sucking air, the engine would lean in flight. After a while it got to the point that it was hard to run. What we did was remove the glow plug and turn the engine over by hand. It bound while turning it over without the glow plug installed. I would try that and see if you have any excessive wear or damage.

Wings,
In all seriousness, if you can't get it to run, don't toss it, send it to me, and I'll get it running and send it back. I'll even give you a tank/fuel line with it. PM me if you are serious.

Jetts

There is one piece of info I left out.

The engine will usually rev up really good one time, sounds great, then all the sudden it dies down, and if you don't close the throttle it will die. Then it will not rev up again untill you kill it and restart it, UNLESS I put my finger over the exhuast untill it almost dies, the when I let off it is fine again. Anyone every experience this?

Thanks,

Wings

wings,
Bottom line is this; it's getting too lean for some reason. Just 'cause it's got JB Weld on it doesn't mean it's shot, heck I got a couple of those, including my 4 stroke!
I was serious about the offer to send it to me, for a free repair, I'll even pay the postage to send it back. I've got more engines than I know what to do with, including two of these evo's, so I'm not going to scam you. I think there is a 95% chance I'll be able to get it going for you, send me a PM if interested.

Jetts

it is starving. probably a leaky something. maybe a carb o-ring if you don't see bubbles in the line

didn't you already say there was bubbles in the line? there is your air leak right there if you do. you have to start at one thing...knock it out....then go to the next. if it is leaning out ...stop the carb from getting air from the tank..then you will know if it's something else. these engines are so simple, most of the time it's the most simplest thing that is wrong.

As noted above.... CLASSIC hole in the clunk line inside the fuel tank.... pull tank, remove stopper, replace line inside tank.

Thanks for the info guys.

I appreciate the offer jett. I don't think you will scam me. I just ordered a new one. I will keep the old one for spare parts. I will prabably tinker with it again maybe I can figure it out. I think it is either the carb, the needle valves or the gas tank. I really don't feel like ripping the tank out. If I hook the new one up and it don't work then I KNOW it is the tank and then I will remove it. In my opinion you can never have too many engines.

Don't get me wrong, I'm not made of money. But if I have two it will allow me to trouble shoot the other one better plus it is a good source of spare parts. And, I know the tank CAN be removed, but I get frustrated very easily and I really don't feel like tackling that unless I have to.

At this point I will come out ahead either way. If the new one works I will be happy. If it don't then I have two engines that work more or less.

Later,

Wings

be sure to respond when you find out....i've got money on the tank

I'll keep you posted.

If you are right I guess my next plane will have to be a 40 size.

One last try here- if you crashed the plane with the engine in question, but didn't destroy it, there is a chance that the clunk line got folded forward. This is fairly common even with some light "nose over" type crashes. Pick up the plane (nose high) and give it a few abrupt downward shakes, then gently shake the plane and listen for the clunk line to rattle around. (tank empty)
If ya do go the new tank route, go to the LHS and check out the different tanks, some (Great planes) are easier to work with. Also the LHS owner may help you put it together before ya leave the shop. Just be sure to stop in and ask if they will first, and then do it when they aren't busy.
Make or buy an engine test stand and when you pull the old tank, use it (if it's good) on the stand.

The plane I crashed is in pieces. This new plane has a brand new tank, it hasn't been flown yet. I had it set up correctly when I installed it, but you are correct in the fact that something could have came loose. Maybe the clunk came off or something. I still have the tank from my trainer. The only reason I bought a new tank is because I bought all the accesories before I crashed my trainer.

I will keep you updated. I don't think I will mess with it much this weekend. Its supposed to be below zero, not including the wind chill for this weekend. My kerosene heater in the garage just don't cut it when it is that cold. Besides, I need a break from that darn thing.

I will let you know what happens when I get the new engine.

Thanks for the suggestions man,


What part of Ohio are you from Jetts? I live in Carrollton KY, about an hour south west of Cincy.
Wings

Wings, No problem, hope you get it all straightened out. Sometimes you are better off getting a new one and flying, and go back to the old one as you said, to tinker with it, and have spare parts.

I live in Ashtabula County, right near the PA border (Pymatuning Reservoir) and yeah it's that cold here too.[:'(]

Jetts