CRRC Pro GF26I

[joseae]

	Quote: Originally Posted by dealinrc
	To me it sounds like a timing problem. Try moving the sensor to the right as far as it will go. That will retard the timing.

I tried that today, no change. Could it be a defective electronic module? What about the spark plug? I have heard some guys say it should be replaced with an NGK. It is obvious this is my first gas engine, I have been flying only glow for many years so excuse my lack of knowledge. I will give some of this stuff a try tomorrow, that is if my arm is not too sore. Thanks for the feedback.

[ken crane]

hmm theres not enough of an adjustment to have the timing so far off with that hall sensor adjustment. with the plug i did change to ngk but only for the reason that the torch brand plug seemed cheap. it could be the ignition module. have tried to remove the plug and rotate the prop shaft back and fourth past the mag to see if you have a good blue spark? also make sure that battery is fully charged. if you accidently reversed the hall effect sensor and the battery lead you casn damage the module as well as they share the same style plug.also you said the hall effect sensor was cracked around one of the holes. does this go into the body of the sensor or just around the hole from tightining it ?

[joseae]

No, it only goes close to the hole, no evidence of any cracking around the sensor itself. The battery is a 1400 mA 4.8 nickel metal and it is fully charged. I have done the removed plug rotation thing several times and I do see a spark, a very tiny clicking blue spark that is. I am not sure if that is enough since I have heard other guys mention a big blue spark, now how big is it supposed to be?

[FLZman]

You may have already answered this but if not, have you opened the top plate to carb? the one with one big screw in middle. Inside is a small screen that filters the fuel. Make sure something hasnt got lodged in there. Also, not to long ago, I had the exact same starting problem on a 50cc (different brand but still a walbro) and finally found that somehow the plunger had got stuck. This is on the other side of carb and the plate is held on by 4 small screws. The plunger is spring loaded and should move freely up and down. You may want to make sure it isnt stuck or the brownish paper gasket hasnt shifted blocking off fuel.

Hope this is of some help

Z

[dealinrc]

Joseae
Check your battery under load. It might read ok when there is no load on it and drop off fast when you put a load on it. There were some problems with son sanyo and jr packs, and also remember this takes a 4.8 not a 6 volt battery pack. If the problem still persists contact me at http://www.rconlysite.com
Even if I did not sell you the engine, I am the closest dealer to you and I will help you with your problem.

[flymoor]

The problem seems a fuel problem and before trying things with the electronics, take the carb of and clean it you can take off the cover and the needles and can squirt some carb cleaner in passages, clean the screen if necessary , etc. put it back together. And try it. But before you do this make sure the plumbing is ok with in the fuel tank, and all the way to engine. Pressure test it and make sure clunk is still attached.
Rich

[ken crane]

	Quote: Originally Posted by joseae
	No, it only goes close to the hole, no evidence of any cracking around the sensor itself. The battery is a 1400 mA 4.8 nickel metal and it is fully charged. I have done the removed plug rotation thing several times and I do see a spark, a very tiny clicking blue spark that is. I am not sure if that is enough since I have heard other guys mention a big blue spark, now how big is it supposed to be?

lol thats hard to discribe. its not a lightning bolt but should be substantial. whats odd is that it ran fine on the test stand. as some have suggested re check the fuel system to make sure the filter in the carb isnt plugged. is their any chance you may have reversed the leads during install? as i suggested that will ruin the ignition. you will get spark but as soon as the plug feels compression it will stop firing.

[joseae]

OK the screen looks good, the plunger looks good, the battery pack was tested plugged into receiver with a Volt watch and servos operating still shows fully charged. I have been extra careful not to reverse the battery and sensor connectors from day one. I'm just trying to figure out if anything else was changed after removing the engine from the test stand. The muffler probably needs a new gasket but I don't think that would be causing this kind of problem; gas tank and lines are the same I had been using on test stand, all plumbing inside the tank is OK. Sensor module is wrapped in foam and mounted sideways (it was flat on test stand) but I don't think that would be a problem either. I am able to choke the engine, no problems there, it seems to draw fuel normally. I flip it a few times and it fires up but as soon as I release the choke and crank it up it either starts backwards a couple of turns or simply runs for a second or two and stops. I just removed and checked the carb again tonight and everything seems to be OK. I also ordered a couple of ngk's which I would be getting tomorrow, just in case. If nothing works tomorrow, I guess my next step will be to go back to square one and put the engine back on the test stand and see what happens.

[joseae]

Problem solved. IT WAS the spark plug. As soon as I replaced the stock plug with an NGK, it only took a couple of flips to start the engine. The only issue I have right now, other than setting up the idle properly, is radio interference. My receiver goes crazy when the engine is running. Even with the sensor box about 15 inches from the receiver it makes it go out of control all the time. I will be trying a different receiver tomorrow but I'm sure this one is in perfect condition. Anyway, thanks everyone for all suggestions.

[FLZman]

Hmm, glad it fired up with the NGK, a little worried why you are getting such interference with that plug. Which NGK did you use?

Z

[joseae]

It's a CMR7H, I believe the Torch that came with the engine is a clone of the NGK.

[3Dguy]

Where did you get your NGK CMR7H?