no sound ?? what the hell!!!

[bos101]

okay so i recently bought a Losi Mega Baja. First had problems getting it to run, thankfully resolved that and broke it in. The first 2 tanks were run on blocks, was goving slight throtle, so it wouldn't shut off, the thrird tank i had it run around the park. So here is the deal, when i went to take it out to get my 4th tank ready i put the electric start on it after priming it and it spun without that sound when u get when u want to start the engine it seemed like there was no resistance from the piston. wtf? so i tried it again and the compression i guess?? came back! Does anybody know what is going on? I'm new to the hobby and its a brand new truck not even a week old. Thank you!

oh by the way the engine was running very rich, i had a guy from the local hobby shop set it up from me

 

[alpinehyperlite]

Just fyi, it dont matter how the motor is "set up" from the shop, it needs to be re-tuned every time you take it out.

 

[neobart]

Your one way bearing in the rotostart backplate is slipping. Next time it happens try this. Take of airfilter and pour about two tablespoons worth of fuel directly in the carb while pulling it open. Loosen(do not remove yet) glow plug and turn the engine over for two seconds with the rotostarter. Remove glow plug, turn truck upside down and pour out excess fuel from the engine. Replace air filter, glowplug and you're ready to go.

This will flush oil residue from the OWB, and you don't have to remove the engine to do it. Just make sure you don't get dirt in the engine while doing it.

 

[Scrogg]

When you break in a new engine always loosen the glow plug a little before starting for the first half gallon. This reduces the stress on the OWB.
An OWB contains needle bearings in a plastic cage inside a housing, sometimes they are inside the engine in a round metal casing. Sometimes they are outside the engine in a hex shaped metal case. Anyways if you break the plastic cage it will slip a lot, until it fails completely and ruins the starter shaft.
Point is starting a new engine cold can break the plastic cage the needle bearings ride in.
Best defense is preheating the engine before cold starts and loosening the glow plug for the first 1/2 gallon of fuel.
I have done this for years and my OWB's do not slip even after 3-4 gallons. They do need an occasional cleaning though.
The oil from the fuel gums up the OWB and prevents proper operation.
Denatured alcohol is the best cleaning solution. WD-40 works, Simple Green works too.
I run a paper towel soaked with whatever cleaner I have handy through the OWB until it comes out clean.
Just remember to apply a bit of high temp bearing grease to the OWB after cleaning it.

 

[bos101]

Whats a OWB???

 

[MotoGod]

OWB = One Way Bearing.

 

[BradZ]

Yeah, the OWB may be slipping.

 

[bos101]

okay that good, i was afraid that my engine might be gone. Thanks