RC engine repairer

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3 years 4 months ago #37 by brace
brace created the topic: RC engine repairer
Hi looking for someone to make some repairs/modifications on an MVVS 40 cc petrol engine.
Who would you recommend?

Glenn

Flying is learning how to throw yourself at the ground and miss.

With more experience, you will learn how to land properly, which is something you will almost certainly screw up, and screw up badly, on your first attempt.

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3 years 4 months ago - 3 years 4 months ago #38 by Simon
Simon replied the topic: RC engine repairer
What do you want done for starters? There are a few places in town that I have been told about.

"An enemy will stab you in your back,a friend will stab you in your front....."
"Beware the Lollipop of Mediocrity,lick it once and you'll suck forever......"
Last Edit: 3 years 4 months ago by Simon.

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3 years 4 months ago #39 by brace
brace replied the topic: RC engine repairer
I need the cylinder liner pulled. Very tight and won't budge even when the head is heated.
Disassembling the motor so I can fit a new hall sensor that needs two new bolt holes drilled and tapped. These holes of course are directly above a bearing :(
So the job would be pull apart engine drill and tap holes clean and reassemble.

Flying is learning how to throw yourself at the ground and miss.

With more experience, you will learn how to land properly, which is something you will almost certainly screw up, and screw up badly, on your first attempt.

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3 years 4 months ago - 3 years 4 months ago #40 by Simon
Simon replied the topic: RC engine repairer
I have been told there is a guy who works at the motorbike shop on Bent street. Apparently he knows all about this type of stuff, and is where the guy I heard about him from gets his chainsaws done. If a MILL owner trusts his work, I would. Trouble is, I can't remember his name, and can't contact the guy I mentioned to ask...I THINK it was Tony, but don't quote me on that.

As to the HALL sensor, it matters not where you have it, it only has to have a 22-38 degree range. ANY of these little motors will run at anything upto about 40 degree. Any number of Youtube vids back that up. I have a tuning guide here on how to set the HAll sensor, and it's simple as.I can do that job for you, I have drills and taps. And I'm sure we could get the liner out with some heat and a knock-o-meter
HALL FITMENT :

1. Measure the diameter of the hub...Multiply by .244 for 28
degrees TDC...This number comes from the formula Diameter x
Pi, 3.14, divided by 360 for 1 degree, x 28...Save this number.
If the diameter of the hub = 40mm
40mm x .244 = 9.76mm
The distance from the prop hub magnet to the hall sensor will
need to be 9.76mm to achieve the 28 degrees timing.
(for practical purposes you can just use 9.8mm as the distance).

That is the distance from the center of the magnet to the closest
EDGE of the HALL sensor….



"An enemy will stab you in your back,a friend will stab you in your front....."
"Beware the Lollipop of Mediocrity,lick it once and you'll suck forever......"
Last Edit: 3 years 4 months ago by Simon.

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3 years 4 months ago #41 by brace
brace replied the topic: RC engine repairer
Thanks sensor location has already been worked out and I have had the engine running with it held temporary by cable tie. Now need to make permanent . Only need to get the liner out and then it should be straight forward. Will drop by the motorcycle shop this week and see if they can pull it without damaging. Everything else I can do.

Flying is learning how to throw yourself at the ground and miss.

With more experience, you will learn how to land properly, which is something you will almost certainly screw up, and screw up badly, on your first attempt.

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3 years 4 months ago #42 by brace
brace replied the topic: RC engine repairer
Engine is apart and now fitting the sensor, should be running by the weekend easily :dry:

Flying is learning how to throw yourself at the ground and miss.

With more experience, you will learn how to land properly, which is something you will almost certainly screw up, and screw up badly, on your first attempt.

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