My Chinese 45 cc gasser uses a RCEXL Ignition setup with electronic spark advance. It kicks back like a mule when starting. A heavy glove is a must. Is this normal? What is the correct method for timing a RCEXL iginition system?

Thanks.

Dave G.

no it should not kick back, There have been a lot of engines coming out of china with the timing set wrong, You can download a timing template form CH ignitons and they have instruction on how to time them, The RCEXL is the same ignition that they sell.

timing should be 28-30 deg before top dead center

Milton

http://www.ch-ignitions.com/CHinst.html

Milton

Thanks, Milton. Yes, I am aware of the CH timing instructions. Where the confusion comes in is that the instructions that I have for my setup has the timing is set at a whopping 40 degs advance. However, once the engine starts it runs well and shows no sign of preignition.
Just onto another subject, how do these (RCEXL and CH ignition) units handle the automatic spark advance? Am I correct in my thinking that after the first flip the ignition goes back to perhaps 2 to 3 degs advance for starting and then goes to a full 28 to 30 degs after about 4000 rpm?
Even with a heavy glove, I am getting tired of getting whacked. My little pinkie still hurts.

Dave G.

If your timing is set at 40 deg it means that you are having to start it at 12 deg above top dead center, Plus at that timing it will make the engine run hot and not get good RPM at full throttle

Milton

Missed part of your post, Yes you are right about how the timing works.

Milton

My test results:
The ignition measures the time the magnet is under the sensor to set the ignition delay.
Above 500 rpm, delay is a full 22 degrees up to 1500 rpm, when delay tapers of to NIL at 4000 rpm
Of course, when turned over slowly, there is no delay to speak of.
Set your ignition anaywhere between 25 and 30 degrees for good engine power.
Do not lazily flip the prop. It WILL kick back due to full advance.
When you flip, you have to mean business, and it will not need a glove, because timing is reduced.

hi .all

Thanks for using my company's products.

Please carefully into the angular position adjustment.
Reference to the following animation.

Thank you.
for information:
We do also get excellent results with 28° timing, and even as late as 26°

Have to be honest.... I cannot understand what the animation is attempting to show us, and I would like to know for my own reference.
It looks like the "engine" animation ia the REAR view??? These are counter-clockwise rotating engines, so the ignition should fire Before Top Dead Center, Yes/No????

The animation shows several magnet positions, good and not good.
Good is when the sensor covers the passing magnet with it's tip. I found the sensor distance to the magnet not critical when using rare earth magnets.

Hi Dave.
I have a CRRC 45 that originally came with a fixed timing electronic ign. I converted to RCXL and set the timing to about 28-30 deg. NO kickback, easy to start and lots of power.

See you at the field,
Cheers, Dave.

No it's a front view from where you start it. It shows the spark happening, then 28-30 degrees later it hits TDC. Takes a little looking at but it's right. The 2nd one confused me at first but also makes sense. Just shows proper magnet and sensor alignment. Pretty cool actually.

Yes....I also see the picture of whats happening! To recap it...I am looking from in front of engine. The crankshaft is turning counter-clockwise! The piston is going upwards. All of a sudden a spark occures about 28 degrees before top dead center. ( as shown) Then the piston continues up & over top dead center with a big push from the expanding charge. I bet Bob can understand it now!!!! Capt,n

Wow Bob, not the small bus 4-u?</p>

lol Nothing like a little poke while he's down eh.

I was just having a little fun with Bob. I would like to say his "sticky" forum with many good tips to have a successful experience with your RC equipment is quite well done. It is a MUST read for new RC fans and it is good to go over &amp; read it for all of us. No Joke, Bob has spent a lot of time helping and I for one thank him for it. Best Reads Capt,n

<span class="Apple-style-span" style="font-family: Times; font-size: 16px; "><span class="Apple-style-span" style="font-family: Arial; font-size: 12px; ">It is still fun to get a poke in when you can. Bob doesn't slip very often. Besides he can take it. </span><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; background-image: initial; background-repeat: initial; background-attachment: initial; -webkit-background-clip: initial; -webkit-background-origin: initial; background-color: rgb(255, 255, 255); font-family: Arial; font-size: 12px; background-position: initial initial; "><div></div><div>On a serious note he has helped many including myself. </div></div></span>

You guys are funny. It's like reading the funnies lol. Ernie

So Super 08. What do you know about zdzs

Not much, I just bought one a few months ago and haven't run it yet. The plane it is in the process of getting mounted in should be done in a couple of weeks. Very nice looking engine though, nicely finished.

I have a ZDZ80, but since it hasn't given me any trouble, I can't comment on any problems. I use the normal starting method not the 5-5-1. Only problem was a bad ignition battery. The previous owner put in a really small battery in an effort to save weight for IMAC. A new higher capacity battery made the starting problem go away, and the plane still flies great with the extra ounce of battery. ;-)

Mine needed help. Exhaust bolt holes were striped out. Nothing a heli coil kit didnt fix. Carb needed rebuilt. And finding a kit for a bing 48 was a fun job haha. And the ignition is bad lol. Sounds like a good deal. I can't return it now im comitted. I'm Building a top flight g/s P47 and the engine is most of the payment... But I will get it going. I does look new. I just cant find much on them on line. I guess that is a good thing / or bad. lol.. Thanks for any info.. Ernie

Wicked! Did my sentence ever suck in my last post. Talk about hard to read.