Dave,
Just got it back from service after waiting 6 weeks. this was after having it back from service a time before and having identical symptoms show up about two weeks later. First I apologize for being bitter. I just got back from the field and I'm really dissappointed. The 63 is still loading up during certain maneuvers but nothing regular. For example sometimes midflight I'll throttle up from 1/3rd throttle and it will take 30 seconds to reach peak rpm. Almost lost my plane tonight doing that. Then later in the same flight after doing the same maneuver that loaded it up before (harrier) it transitioned lightning quick and was screaming, like it should. It's also detonating which it never did for the first 5 gallons for fuel. To refresh you, this engine was nothing but perfect for about the first 5 gallons. club members even went out and bought YS engines because they were sold on my relaible YS63. Then it started loading up on flat spins. Then I sent it in and they replaced the regulator. Well it started again and they again replaced the regulator and put a gasket set in according to the service slip they shipped the engine back with. I don't get it. I've already missed a lot of flying waiting for this to be fixed and it wasn't. I've got a very bad taste in my mouth about YS engines. I'm so close to giving up and buying something else. Yet in the back of my mind, I know this engine can run perfectly.

For what it's worth I'm running a Zinger 13x5 prop, peak rpm this evening was 11,400 rpm. Cool Power 30% heli fuel. Idles reliably at 2000-2100 rpm. New OS type F glow plug. Valves adjusted to .003". Before i did anything I set up the engine to factory settings and used the run instructions on the YS website. What do you think?

Mike

I think you ought to call Richard at service. I really can't do much for you since service is a separately owned business which I have no control over. The number is 775-782-4562.

Before doing that, though, I would completely re-plumb the fuel system and REPLACE the tank. If the tank you are using is soft and flexible in any way, it can completely ruin the way a YS runs. Never mind that it holds pressure, it also has to be stiff, not flexible at all. If in doubt, wrap the tank with glass filiment tape. Make sure the firewall and mount are in good shape as well.

I don't blame you for being p----d, but let's see if the problem lies elsewhere before proceeding.

D

Thanks for the reply Dave. The tank is the ONLY thing that remains. I replaced everything else. the tank is wrapped with strapping tape, but to rule it out, I'll see if I have another one handy to test. I'm also using fuel dots. I think again to test it I'll plum it up as a straight shot right to the engine. I hope it's something this simple.

Mike

Me, too. Let me know please.

D

I don't want to celebrate prematurely but I made an interesting discovery taking the tank stopper out today. First it came out awfully easy. I didn't think anything of it until I looked in the tank and saw a couple black chunks of something. I then looked at the stopper and noticed a big divot taken out of it. Must've been a defect in the stopper that part of it fell apart. Well these little pieces were all gathered around the clunk. Sure would explain why one minute it's screaming, the next it's flooded huh. I put a new sullivan stopper and also replaced the clunk line just to be sure so now the entire fuel system is new. Will find out for sure if this was the problem tomorrow. Sure sounds promising though. Cant beleive I didn't check this before. Too windy today to fly so hopefully I'll have success tomorrow.

Mike

Good Luck!

No dice. Runs as poorly as ever, loading up on the transition even with the regulator screw all the way in. I can't beleive this crap. I guess I'll call Richard at service. Can you put in a good word and let him know I'll be calling so I don't get the standard "send it in and we'll fix it" reply? Thanks

Mike

You may get that anyway. Send it Priority Mail to me, and I'll see what I can do about it.


Dave Shadel
P.O.Box 3146
Gardnerville, NV 89410

Dave,
I talked with Richard from service on the phone and expressed my frustration. As a last ditch effort he suggested keeping the regulator flush and leaning out the low end. He says he's seen many 63S engine that run with the low speed screw about 5 turns out. Mine is now at 4 turns out and to my surprise it's actually running better. It still will load up after doing a spin, but not nearly as much. I may try to lean the low end out some more. My concern is that this setting is so far from the factory settings. Does this sound right? Also, why would it change this much. For the first 5 or so gallons it trasistioned and idled fine at 2 turns out. Now it needs 4 or more turns out?

Mike

Try it and let me know. I've been surprised before, but bet I won't this time.

Again no dice. A club member and I just spent about 3 hours chasing settings on this engine to no avail. IT's just plain erratic. Sometimes you think it's fixed, then it loads up and won't advance. Sometimes after you shut it off it's dripping fuel out of the carb, sometimes not. Sometimes after an otherwise perfect flight and landing, I'll add throttle to taxi back to the pits and it just sits there and loads up and takes 20 seconds to get enough rpm to move it forward in the grass. The only thing that is constant is the detonating, which will not go away even after trying three different fuels, all fuels meet YS requirements. Valves are adjusted to spec. I'm very frustrated. If this were a car the lemon law would kick in. Three times for the same problem is crazy. To top it off my warranty runs out tomorrow. I don't wanna get screwed on warranty work so I'm gonna send it in. Thanks for your time Dave. Will call Richard ASAP tomorrow.

Mike

Please PM me before you send it in. Thanks.

Mike,

Your frustration level is on par with mine: http://www.rcuniverse.com/forum/m_4601132/tm.htm