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Engines and Mufflers Having problems or need advice on Engines or Mufflers? |
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11-17-2016, 01:27 PM | #1 (permalink) |
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Join Date: Dec 2013
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How to Tell? (Clutch Slipping)
I'm trying to tell if my clutch is starting to slip. The last few days I've been flying and my 105hzr fires right up and then after flying and sitting for 10 to 15 minutes it is hard to start. So I give it some throttle trim, no go, some more trim, no go. Then I put the wand back in and it makes a pop and fires right up with authority. Its done this the last couple of days. Its irregular, any other time after flying I can start it right up in hold mode with no problem. The bearings have great compression so I'm leaning towards my clutch. When it does start it starts very aggressively, like it catches and fires really hard. I even tried a new plug, same thing. I have 130 flights on this clutch and setup with no issues. Just wondering how you can tell if your clutch is starting to slip or is this a one way problem. This is my first nitro, which has been awesome, but I'm still learning.
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11-17-2016, 01:55 PM | #2 (permalink) |
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Join Date: Jul 2005
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A hard starting engine should have nothing to do with a clutch or one way slipping. If the clutch or one way slip. You will have over revving or feel a big lack of collective pop. One thing to keep in mind. With the weather changing you will need to richen your mixture. It sounds like you could be running lean. Also, check your tank pressure. Is your tank pressurized after sitting for 15 minutes? If not that could be your problem. Also, after 130 flights depending on how it was running. It may need a new ring. My first guess would be to richen the mixture though. As it cools off you will need to re-tune.
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11-18-2016, 08:45 AM | #3 (permalink) |
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Join Date: Jan 2013
Location: DC
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+1
The clutch is not at all engaged upon startup so it has nothing to do with a hard starting engine. The bearings also have nothing to do with compression. That will be your piston ring's job. Try richening the idle needle a few degrees and see if that helps. Try yet another plug. If your fuel is old get new fuel. Clean out your fuel filer. Carefully inspect all fuel lines for cracks, etc. If none of that does the trick you will probably have to pull the engine and maybe the tank for a disassembly and closer look.
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11-18-2016, 09:11 AM | #4 (permalink) |
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Join Date: Dec 2013
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how are you shutting your engine off after flying? closing the throttle all the way or pinching the fuel line? I find that if I kill the engine after a flight by pinching the fuel line the motor will start right away after refueling.
I would also try adjusting your idle mixture screw as other suggested. Adjust it while its idling. Richen it up until the idle slows down and sounds like its about to die then lean it just a little bit so its a stable idle. |
11-18-2016, 12:06 PM | #5 (permalink) |
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Join Date: Aug 2012
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Check your engine bearings (rear especially). If the bearing is starting to go, it'll drag more and the engine won't idle.
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Team Only Fine Helis |
11-18-2016, 01:21 PM | #6 (permalink) |
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Thread Starter
Join Date: Dec 2013
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What I was trying to get at is today I went out and it fired right up. Got done flying, refueled and it started right back up with no problem. Yesterday what happened is I let it sit for a half an hour in between flights and it was a bitch to start up when it sat for that long. When I'm done for the day, I always take off the fuel line or pinch it and burn the remaining fuel out and it always fires right up the next time I fly. This happened to me twice in a day when I let it sit for a long time in between flights without pinching the fuel line and I thought for some reason the clutch wasn't engaging. But it was just from sitting too long before flying again, nothing to do with the clutch.
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11-18-2016, 02:32 PM | #7 (permalink) |
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Is the starter bogging down slightly when its difficult to start (More so than when it starts easily)?
Perhaps the regulator is leaking very slowly, and if the heli sits for an extended period, enough fuel leaks into the crankcase to slightly hydro-lock the engine, making it difficult to start. |
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