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ASP/MAGNUM FS400AR Rebuild/Overhaul

Old 03-22-2014, 05:47 AM
  #2851  
Don Cunningham
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Well I will try to give you the steps I took
1. I tore down the engine because it was not run for 15,20 years
2. The inside of the engine was full off junk ( castor ) I replaced the main bearings, remove the piston rings and cleaned the ring grove,all parts were cleaned. # 4 ring was replace, I broke it, this is one of cly. that has no compression. Thats why I wonder what I did wrong.
4. How do you perform a leak test?
5. Cam timing was good I lined up the spots on the gears. I made sure the it was right on.

Because of no compression I removed plug and inserted a dowel. I then turned until rockerarms did not move. Piston was at high point. I then ajusted valves. With the head off, I put my hand over the cly. and I thought I had good compression.
Thank you Don Cunningham
Old 03-22-2014, 06:58 AM
  #2852  
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Hi Don

You say you have no compression? now when you say 'no' do you mean none or that its very weak? if it is weak I would not worry too much and as long as you can turn the engine smoothly I would run the engine and see if the rings come in. use a small ish prop and get the rpm up and the engine leaned out (not fully) fairly quickly. I would run it for about 2 minutes to warm it up and then open it up. Don't screw the life out of it, but you need to get the engine upto temperature and the rpm up a bit as well.

If you have no compression at all do as bj suggested and put some oil into the cylinder. Swirl it around so the ring and valves are covered in oil and see if you still have nothing. if so then most likely a valve is stuck
Old 03-24-2014, 03:44 PM
  #2853  
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The other thing to maybe look at are the valve seats/faces and/or guides themselves...?

Everything is pretty small on these things, but it might be worth giving the valve seats and faces a decent eyeball - make sure there isn't a ding somewhere due to ingesting a bit of junk, or a scratch or burn-out excessive wear... or just bad engineering somewhere (??)

BJ

PS - I'm guessing there's no cracked rings... holes in piston crowns or anything else obvious...?

Last edited by BJ64; 03-25-2014 at 05:15 AM.
Old 03-27-2014, 12:59 AM
  #2854  
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Keleo arrived today

Will have to fire the 400 with 'plumbers pentagon' pipe and do a quick vid - then fit the Keleo and do the same... just for a sound comparision if nothing else.

I have no idea if there's any performance gains etc. to be had with the Keleo, but I'll say one thing for sure - it's a work of art. The workmanship is impeccable.

Simply Divine.

BJ
Old 03-30-2014, 11:39 PM
  #2855  
Carosel43
 
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I was able to fly my 400 on Saturday having mixed up my new fuel. The engine ran pretty well but judging by the colour of the mess coming out of it I feel it really is not long for this world despite improved performance. Once this gallon of fuel has gone (I have about 4 flights worth left) then I will retire the engine for the time being
Old 03-31-2014, 10:34 AM
  #2856  
Kmot
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Seems you have this thought before Jon!
Old 03-31-2014, 11:25 PM
  #2857  
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Lol yeaaa, but this time I think it really is final as I desperately need the space in the hangar. I have another model I can hang the 400 on if I want to, but right now its awaiting a new laser for me to test fly before it goes into the sea fury
Old 04-01-2014, 10:41 PM
  #2858  
Kmot
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How's that video coming along BJ?

Old 04-02-2014, 02:14 AM
  #2859  
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Its.... um... "coming"

BJ
Old 04-16-2014, 12:53 AM
  #2860  
SJN
 
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Look what just showed up

The little 180cc moki is not that much larger than the ASP 400.....just a little more meat on the bones
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Old 04-16-2014, 03:20 AM
  #2861  
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Originally Posted by SJN
Look what just showed up

The little 180cc moki is not that much larger than the ASP 400.....just a little more meat on the bones
Very nice, I didn't know Moki did a 180cc...
Old 04-16-2014, 03:27 AM
  #2862  
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I've a question about valve clearance as I'm about to look at mine.

If I understand correctly, the cams actually rotate at 1/8th crankshaft speed and have 4 sets of cam profiles. Is it safe to assume that the 'land' between the cam lobes (and therefore the valve gap) will be consistent on all four, or should the clearance be measured for all four sets of gaps if you see what I mean?
Old 04-16-2014, 03:41 AM
  #2863  
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The 180 has replaced the 150 model....same size, just larger bore.

Tim, it should be messured all sets, as the cam gear is not perfectly centered......you will see when you measure :-)

Even my new moki manual says to check the clearance 2 places, as it has 2 sets running in a planet gear.

Last edited by SJN; 04-16-2014 at 03:43 AM.
Old 04-16-2014, 03:50 AM
  #2864  
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Sensational motor, SJN.

But... over AU 4 grand??

That's a bit out of my league.

I notice you said "not that much bigger than the ASP 400".

The ASP is 60cc, the Moki 180cc. Are they just running bigger bore/stroke?

BJ

PS - just looked at your pics. A bit deceptive at first glance, but I reckon it's a lot bigger. And probably quite a bit heavier too?

Last edited by BJ64; 04-16-2014 at 03:53 AM.
Old 04-16-2014, 07:03 AM
  #2865  
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Hi Tim, if memory serves the 400 radial has 3 pairs of cam lobes and rotates at 1/6th crank speed.
Old 04-16-2014, 07:35 AM
  #2866  
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Originally Posted by Carosel43
Hi Tim, if memory serves the 400 radial has 3 pairs of cam lobes and rotates at 1/6th crank speed.
Ah, thanks that saves a bit of time! Don't know where I got the idea it was 4 sets...
Old 04-16-2014, 10:21 AM
  #2867  
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Yea, is is ofcourse a lot larger CC wise, but I ment the dimensions are not that much larger :-) . It weighs 4.3kg, and the ASP if I remember is about 3kg....i think.
Cant wait to get it installed, and fired up....and wont miss the corrosiveness of methanol and nitro :-)


Originally Posted by BJ64
Sensational motor, SJN.

But... over AU 4 grand??

That's a bit out of my league.

I notice you said "not that much bigger than the ASP 400".

The ASP is 60cc, the Moki 180cc. Are they just running bigger bore/stroke?

BJ

PS - just looked at your pics. A bit deceptive at first glance, but I reckon it's a lot bigger. And probably quite a bit heavier too?
Old 04-17-2014, 04:46 AM
  #2868  
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Where's SignorTelemaster when you need him?

You MUST run your Moki on Methanol + CDI (just kidding )

BJ
Old 04-17-2014, 11:27 AM
  #2869  
Kmot
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Oh Sonny, I am sooooooooooooo envious!!!

Congrat's!!!
Old 04-17-2014, 01:58 PM
  #2870  
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Thanks Tom :-)
Old 04-17-2014, 02:35 PM
  #2871  
SrTelemaster150
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Originally Posted by SJN
Yea, is is ofcourse a lot larger CC wise, but I ment the dimensions are not that much larger :-) . It weighs 4.3kg, and the ASP if I remember is about 3kg....i think.
Cant wait to get it installed, and fired up....and wont miss the corrosiveness of methanol and nitro :-)
Corrosiveness of methanol/nitro is a myth as long as raw fuel is not left in the engine.

Originally Posted by BJ64
Where's SignorTelemaster when you need him?

You MUST run your Moki on Methanol + CDI (just kidding )

BJ
Imagine what a 25% power boost on methanol would be like.
Old 04-17-2014, 02:42 PM
  #2872  
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Well, here is my before, and after shots of my engine.

Im sure that if it was run on gas, it would not look like this
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Old 04-18-2014, 12:10 AM
  #2873  
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Telemaster is correct, glow fuel is no problem as long as its not left to sit in the engine. When that happens it attracts water and things go very nasty. Generally 4 strokes are more resistant to rust than 2 strokes as they never have any raw fuel in the crankcase which is why I personally think the intake mod for the 400 is a bad idea as raw fuel is being introduced to the crankcase. That said, if an engine is run regularly its far less of a problem
Old 04-18-2014, 07:02 AM
  #2874  
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Originally Posted by Carosel43
Telemaster is correct, glow fuel is no problem as long as its not left to sit in the engine. When that happens it attracts water and things go very nasty. Generally 4 strokes are more resistant to rust than 2 strokes as they never have any raw fuel in the crankcase which is why I personally think the intake mod for the 400 is a bad idea as raw fuel is being introduced to the crankcase. That said, if an engine is run regularly its far less of a problem
Have you seen the latest intake (tub/plenum) mod for the Saito FA-450R3/FG84R3? http://www.rcgroups.com/forums/showp...&postcount=163

On the FG84 it turns a 23X12 @ 6240RPM. That's about 7.75HP & the CHTs are within 4F on all 3 cylinders. The stock backplate only baseline turned that prop @ 5600RPM & CHTs varied widely.
Old 04-18-2014, 07:14 AM
  #2875  
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Originally Posted by SJN
Well, here is my before, and after shots of my engine.

Im sure that if it was run on gas, it would not look like this
I think the biggest problem there is lack of adequate crankcase breathing. That leads to condensation build up. Unlike singles & boxer twins, there are no positive/negative pressure pulses to move crankcase gasses out & pull fresh air in.

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