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revo 3.3 help?

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revotalk

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hi all, i have just joined today. i have just bought a revo 3.3 secondhand and require some help please? i have read posts and searched the net but can't get it started. i have put new fuel and glow plug in it charged all batterys but it just wont fire up?? its not flooded and the ez starter turns over but its not firing up? any suggestions would be very much appreciated.:)
 
Are you using the EZ Start? Is fuel visible in the fuel line? Is The pressure line attached to the Pipe and Tank? If you are using the EZ start, is the harness grounded? Pull the Glow Plug and attach the wire and fire the EZ and see if it glows. Anyone here needs more information in order to help you.

Traijin
 
thanks yeah, I'm using the ez start there is fuel in the line,have just taken the plug out and fired it the plug dose not glow??
 
Check the wires to be sure the insulation is not cut. Be sure the yellow (I think... the one with a metal hoop) wire is grounded under and an engine bolt. When checking for the glow, make sure you fire it for 5-10 seconds (drop a little oil in the engine too) and watch the glow plug, also do this in dim light to make sure you aren't missing the red glow.

Traijin
 
if you had the plug connected to the wire, and it did not glow. it is bad. you will need to purchase a new glo plug.
 
i have tried it with two new glow plugs, and the wiring is brand new with the ground under a bolt.? i have even tried using an ignitor which glows the plug but it still wont fire up?
 
Does the engine have a vacuum leak? Is there a copper shim under the head? Does fuel ever spray from the exhaust? Is is difficult to turn the motor by hand (ie is there pinch)? I s the Air Cleaner clean?

Traijin
 
I'm not sure how you check for a vacuum leak? no nothing comes out the exhaust, i can feel pressure coming out thoe, and the air filter is clean.
 
An internal combustion engine is not difficult. Any Combustion engine needs air, fuel, compression, and ignition. You initially asked, why won't this start? Hell, I don't know... I wish I was omniscient. Anyway, just like any other complex system with problems you must start getting rid of what is working correctly to zero in on what is not working right.

Air: If the air cleaner is clear and the carburetor has no obstructions, consider this issue okay and move on. This one is easy.

Fuel: Follow the fuel from the supply. Are all the fuel lines attached? Are they clear? Is the fuel making all the way to the carb? If fuel is coming out of the pipe, it is generally a sign that it is flowing. Air leaks fall under this category as well. An air leak causes loss of vacuum therefore poor draw of fuel and possibly introducing air into the fuel which causes a lean conditions. Search sealing an RC engine on the internet. There are walk throughs on how to do this with copper RTV. Is the fuel correct for the application? If you have been cranking away and never flooded the motor and locked up.... something does not seem right. Ensure the fuel is going into the engine.

Compression: AKA (in the RC world) Pinch (Motorcycles) Squish... Is the piston to sleeve mating still tight? While rotating the flywheel, does it get tough to move it when approaching TDC? Is the head bolted down well? Is the head shimmed correctly? This is usually easy to ascertain.

Ignition: Does the glow plug actually glow? Is it the right glow plug for the application? Is the Glow Plug screwed in tight?


Start going through this stuff and what ever remains is the culprit. So go through the list and verify Air, Fuel, Compression, and Ignition.

Traijin
 
If you use an ignitor it will glow without contact, I do it all the time to check.
 
He didn't say anything about a separate ignitor, and you mentioned the yellow ground wire. Then told him to attach the ez start wire to the plug and turn it over to see if the plug glows. Which won't happen unless you ground the plug.
 
Metalhead Matt said:
He didn't say anything about a separate ignitor, and you mentioned the yellow ground wire. Then told him to attach the ez start wire to the plug and turn it over to see if the plug glows. Which won't happen unless you ground the plug.
Click to expand...

Read his posts closer


revotalk said:
i have tried it with two new glow plugs, and the wiring is brand new with the ground under a bolt.? i have even tried using an ignitor which glows the plug but it still wont fire up?
Click to expand...
 

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