ORIGINAL: soarrich

I did some work on the SV50's, the way they came through they where mis-timed, the timing was way advanced and made it run very hot. Check the timing first, you may have to elongate the slots in the black sensor to get it to time properly. Someone was selling special black housing that had long slots in them already. There are a few other things you can do too to make them better.

ORIGINAL: soarrich

This should help you set-up your engine:

The easy no math timing.

Cut a strip of paper 1/4'' x 5''.

Rap the paper around the prop drive, back by the crankcase where the magnet is. Overlap the paper then cut with a #11 blade cut though both layers of the paper.

Now you have a piece of paper the exact circumference of the prop drive.

Cut it in half, take one of the halves and cut that in half again, take that and cut it in half also. Now cut it so it's in 1/3 and 2/3 pieces.

The 2/3 piece is how much before TDC the engine should fire, (30*).

Now find TDC by removing the spark plug, then sticking something in the hole, a pencil works fine. Move the crankshaft until the piston. is at the top of the cylinder, you'll find that about 5* either side of the TDC it doesn't feel like the piston is moving. Wiggle the crank back and forth until you can find the center of this piston not moving zone, that's TDC.

Now with a marker make a line across the edge of the prop drive onto the crankcase, it doesn't matter where, just that it's easy to see.

Now turn the prop drive clockwise a distance equal to the 2/3 piece of paper.

Plug the ignition into a 4.8v battery, and turn it on.

Now with the two screws loosened move the sensor off the magnet until you hear the ignition pop.

Tighten the screws for the sensor down, then confirm that the timing is still set that 2/3 piece of paper before the TDC mark.

You may have to lengthen one of the grooves in the sensor mount to get the timing correct.

1.Start the engine, set the throttle so the engine is going 3500 rpm.

2.With the engine running I turn the ''L'' needle in, it is always the needle that is closest to the engine, when the engine speeds up to 4000 rpm I adjust the throttle to bring it back to 3500 rpm. You keep repeating this step until your engine doesn't speed up anymore when you turn the ''L'' needle in.

3.Turn the ''L'' needle out 3/16th of a turn.

4.Open the ''H'' needle 2 turns out, open the throttle all the way open. Now slowly turn the ''H'' needle in the engine will increase in rpms. Turn the needle about 1/16 at a time, when you get no more increase in rpm the ''H'' is set properly.

5.Set you idle speed with your throttle trims, it's best to take the idle stop screw completely out, you should have it so the idle is correct with the trim in the middle, and the low trim kills the engine.

6.With the engine running at the idle speed that you fly at you should now be able to snap the throttle open and the engine quickly speed up. If it just dies, turn the ''L'' needle out 1/16th of a turn, repeat this step until is quickly speeds up. If when you snap the throttle open it stumbles then speeds up turn the ''L'' needle in 1/16th of a turn until it cleanly and quickly speeds up.

7.Close the hole or notch up in the choke plate, I'll post a picture of what I mean, I do it with soldiering the hole close, some use glue or a bolt.

After you modify the choke plate the way to start the engine is:
a. Close choke completely.
b. Open throttle half way.
c. Flip engine with ignition on until the engine coughs.
d. Take choke fully off.
e. Set throttle just above idle, flip until it starts, usually 3 to 5 flips.

The above will work on all engines, but is this the engine you are talking about? It came in different colors. If so the quick mod of the carb mounting block is worth 3~400rpm. The the engines as they came turned a Xoar 22x8 6200 rpm, I was able to get them to turn 6800, but the engine mounting lugs blow off.[:@] Your better off using a 20x8 or a 18x10 and letting the engine spin-up more. It will never be a real strong engine, the ports are too small, but some can be good enough to use.

ORIGINAL: VampeD4

is the 3/8 after or before ??

i turn it to TDC the way it will turn when its running.

before the pickup or after. ??

and were the mag starts or the center of it ??